JP2014228369A - Electronic clock and method for controlling reception by electronic clock - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic clock and a method for controlling reception by the electronic clock capable of improving the accuracy of displayed time of day while suppressing power consumption.SOLUTION: An electronic clock 1 has: a first time measurement unit 411 for acquiring time-of-day information by having a receiving device 30 receive a satellite signal from one GPS satellite; a first determination unit 481 for determining whether a difference between the time-of-day information acquired by the first time measurement unit 411 and internal time-of-day information is greater than or equal to a first prescribed value; a second time measurement unit 412 for acquiring, when the difference is determined to be greater than or equal to the first prescribed value, at least two pieces of time-of-day information by having the receiving device 30 receive a satellite signal from at least two GPS satellites; a second determination unit 482 for determining whether a difference between the two pieces of time-of-day information acquired by the second time measurement unit 412 is less than or equal to a second prescribed value; and a time-of-day correction unit 450 for correcting, when the difference is determined to be less than or equal to the second prescribed value, the internal time-of-day information on the basis of the time-of-day information acquired by the second time measurement unit 412.

Description

  The present invention relates to an electronic timepiece that receives a satellite signal transmitted from a position information satellite and corrects a display time, and an electronic timepiece reception control method.

2. Description of the Related Art Conventionally, there is known an electronic timepiece that receives a satellite signal transmitted from a position information satellite, acquires time information, and corrects a display time based on the acquired time information (see, for example, Patent Document 1). When such an electronic timepiece corrects the display time, it searches for a position information satellite, and acquires time information from the position information satellite that was first captured. Here, when the electronic timepiece is located in a place where reception conditions are bad, such as behind a building, the signal strength of the satellite signal becomes low and it is easily affected by noise. For this reason, the electronic timepiece may not be able to acquire correct time information from the captured position information satellite. In this case, the display time cannot be corrected correctly.
For this reason, the electronic timepiece of Patent Document 1 determines whether the received time information is correct. That is, as a first method, the electronic timepiece of Patent Literature 1 acquires time information from two position information satellites and compares the acquired time information to determine whether the time information has been acquired correctly. ing.
In addition, as a second method, the electronic timepiece of Patent Document 1 has been able to correctly acquire the time information by comparing the difference between the time information acquired from the position information satellite and the internal time information measured by the electronic timepiece with a threshold value. Judgment is made.

JP 2009-145318 A

However, since the process of receiving satellite signals consumes a large amount of power, the first method for comparing time information acquired from two position information satellites needs to receive satellite signals from two position information satellites. The power consumption of the electronic timepiece will increase.
In addition, the electronic timepiece measures the internal time information using a crystal oscillator while the satellite signal is not received, and a maximum deviation of about ± 15 seconds occurs in the month. For this reason, for example, if the electronic watch continues to be unused, and several months have passed since the time information was acquired by the previous satellite signal reception, the internal time information may be shifted by several tens of seconds from the current time. There is. For this reason, the second method for comparing the difference between the time information acquired from the position information satellite and the internal time information with a threshold has the following problems.
That is, although the time information can be acquired correctly, the difference becomes large, and it may be erroneously determined that the time information cannot be acquired correctly. In this case, the display time is not corrected. For this reason, the display of the incorrect time is continued, and the accuracy of the display time is lowered.

  An object of the present invention is to provide an electronic timepiece and an electronic timepiece reception control method capable of improving the accuracy of display time while suppressing power consumption.

  An electronic timepiece according to the present invention includes a receiving unit that receives a satellite signal, a time measuring unit that measures internal time information, and a satellite signal received by the receiving unit that causes the receiving unit to receive a satellite signal of one position information satellite. A first time measuring unit for acquiring time information from the first time determining unit, and a first time determining whether a difference between the time information acquired by the first time measuring unit and the internal time information is equal to or greater than a first predetermined value When the determination unit and the first determination unit determine that the difference is greater than or equal to the first predetermined value, the reception unit receives satellite signals of at least two position information satellites, and the reception unit receives A difference between the second time measuring unit that acquires at least two time information from satellite signals of the at least two position information satellites and the at least two time information acquired by the second time measuring unit is a second predetermined value. A second determination unit that determines whether or not: A time correction unit that corrects the internal time information based on the time information acquired by the second time measurement unit when the second determination unit determines that the difference is equal to or less than the second predetermined value; It is characterized by having.

According to the present invention, when the difference (time difference) between the time information acquired by the first time measuring unit and the internal time information is less than a first predetermined value (for example, 60 seconds), the acquired time information is the correct time. It can be determined that the time information has been correctly acquired by the first time measuring unit. For this reason, internal time information can be corrected with the time information acquired in the 1st time measuring part. In this case, since the second time measuring unit does not operate, the receiving unit need only receive the satellite signal of one position information satellite.
That is, according to the present invention, when the difference is less than the first predetermined value, the internal time information can be corrected only by causing the receiving unit to receive a satellite signal of one position information satellite. Then, when the first time measuring unit cannot acquire correct time information, or when the difference is greater than or equal to the first predetermined value, such as when the internal time information is significantly different from the current time, the second time measurement is not performed. The time part operates and the receiving part receives satellite signals of at least two position information satellites.
As a result, the frequency at which the receiving unit receives satellite signals of at least two position information satellites can be reduced, and compared to the case where the receiving unit receives satellite signals of at least two position information satellites each time, it takes more time to receive satellite signals. The average power consumption can be reduced.

In addition, according to the present invention, the difference between the time information and the internal time information is the same as when the first time measuring unit cannot acquire correct time information or when the internal time information is greatly deviated from the current time. When it is 1 or more, the second time measuring unit acquires at least two pieces of time information from satellite signals of at least two position information satellites. And a 2nd determination part determines whether the difference (time difference) of the at least 2 time information acquired in the 2nd time measuring part is below a 2nd predetermined value (for example, 10 second). Here, if the time information difference is equal to or smaller than the second predetermined value, it can be determined that the time information is correctly acquired. When the second determination unit determines that the difference is equal to or smaller than the second predetermined value, the time correction unit corrects the internal time information based on the time information acquired by the second time measurement unit. Usually, since the two time information acquired by the second time measuring unit matches, the time correcting unit corrects the internal time information with one of the two time information. Further, when the two time information acquired by the second time measuring unit is different, for example, the internal time information is selected with one selected time information such as time information with high signal strength or time information close to the internal time information. Correct it.
As a result, the electronic clock continues to be unused, and the time information has not been acquired for several months since the previous time information was acquired. Can correct the internal time information correctly.

  In the electronic timepiece according to the aspect of the invention, the first time measuring unit starts the capturing process of the position information satellite by the receiving unit, and continues the capturing process until the receiving unit captures at least two position information satellites. It is preferable to make it.

  According to the present invention, since the acquisition process is continued until at least two position information satellites are acquired after the start of reception in the first time measurement unit, when acquiring time information in the second time measurement unit, There is no need to re-execute the acquisition process of the position information satellite in the receiving unit. For this reason, compared with the case where the acquisition process is stopped when one position information satellite is acquired by the first time measurement unit and the acquisition process is started again by the second time measurement unit, the acquisition process time of the position information satellite is reduced. This can shorten the reception processing time.

  In the electronic timepiece according to the aspect of the invention, the first time measuring unit starts the acquisition process of the position information satellite by the reception unit, and stops the acquisition process when the reception unit acquires one position information satellite. Is preferred.

  According to the present invention, the acquisition process by the first time measuring unit stops when the receiving unit acquires one position information satellite. As a result, the internal time information can be corrected with the time information acquired by the first timekeeping unit, and when it is not necessary to operate the second timekeeping unit, the time for the capture process can be shortened and the power consumption of the electronic timepiece Can be reduced.

In the electronic timepiece of the invention, it is preferable that the time information acquired by the first time measuring unit is information indicating hour, minute and second.
Here, the information indicating hour, minute and second is a Z count included in the satellite signal. The Z count is a signal transmitted from the position information satellite every 6 seconds. For example, the signal interval is shorter than the week number (WN) indicating the date of transmission from the position information satellite every 30 seconds.
According to the present invention, since the first time measuring unit acquires the Z count with a short signal interval, the time information can be acquired in a short time, and the time required for correcting the internal time information can be shortened.
If the internal time information is corrected based only on the Z count, the date cannot be corrected. However, the accuracy of the quartz clock is unlikely to shift to date information, and there is no practical problem even if the date cannot be corrected.

In the electronic timepiece of the invention, it is preferable that the time information acquired by the second time measuring unit is information indicating an hour, minute, second (Z count).
According to the present invention, since the second time measuring unit acquires the Z count with a short signal interval, the time information can be acquired in a short time, and the time required for correcting the internal time information can be shortened. In addition, the accuracy of the quartz clock is unlikely to shift to date information, and there is no practical problem even if the date cannot be corrected.

In the electronic timepiece of the invention, it is preferable that the time information acquired by the second time measuring unit is information (week number) indicating hour, minute, second (Z count) and date.
According to the present invention, the time information determined by the second determination unit is the Z count and the week number. For this reason, the amount of information to be determined can be increased and the determination reliability can be improved as compared with the case where the determination is performed based only on the Z count.
Further, according to the present invention, since the internal time information is corrected based on the Z count and the week number, the year, month, day and day of week can be corrected in addition to the hour, minute and second.

  The present invention is a reception control method for an electronic timepiece having a receiving unit for receiving a satellite signal and a time measuring unit for measuring internal time information, wherein the receiving unit receives a satellite signal of one position information satellite, and the reception The difference between the first time measurement step for acquiring time information from the satellite signal received by the unit and the time information acquired in the first time measurement step and the internal time information is greater than or equal to a first predetermined value. If the difference is determined to be greater than or equal to the first predetermined value in the first determination step and the first determination step, the reception unit receives satellite signals of at least two position information satellites, A second time measurement step of acquiring at least two time information from satellite signals of the at least two position information satellites received by the receiving unit; and the at least two times acquired in the second time measurement step. A second determination step for determining whether or not a difference in information is equal to or less than a second predetermined value; and when the difference is determined to be equal to or less than the second predetermined value in the second determination step, the second A time correcting step of correcting the internal time information based on the time information acquired in the time measuring step.

Also in the present invention, the same effects as the invention of the electronic timepiece can be achieved. That is, according to the present invention, when the difference (time difference) between the time information acquired in the first time measurement step and the internal time information is less than a first predetermined value (for example, 60 seconds), the acquired time information is It is highly possible that the time is correct, and it can be determined that the time information has been correctly acquired in the first time measurement step. For this reason, internal time information can be corrected with the time information acquired at the first time measuring step. In this case, since the second timing step is not executed, the receiving unit only needs to receive a satellite signal of one position information satellite.
That is, according to the present invention, when the difference is less than the first predetermined value, the internal time information can be corrected only by causing the receiving unit to receive a satellite signal of one position information satellite. When the time difference is not less than the first predetermined value, such as when the correct time information cannot be obtained in the first time measurement step, or when the internal time information is greatly deviated from the current time, the second time measurement is not performed. The time step is executed and the receiving unit receives satellite signals of at least two position information satellites.
As a result, the frequency at which the receiving unit receives satellite signals of at least two position information satellites can be reduced, and the average value of power consumption due to reception of the satellite signals can be reduced.

In addition, according to the present invention, the difference between the time information and the internal time information is the first difference as in the case where the correct time information cannot be acquired in the first time measurement step or the internal time information is greatly deviated from the current time. When it is 1 or more, the second time measurement step acquires at least two pieces of time information from satellite signals of at least two position information satellites. Then, in the second determination step, it is determined whether or not the difference (time difference) between at least two pieces of time information acquired in the second time measurement step is equal to or less than a second predetermined value (for example, 10 seconds). Here, if the time information difference is equal to or smaller than the second predetermined value, it can be determined that the time information is correctly acquired. When it is determined in the second determination step that the difference is equal to or smaller than the second predetermined value, the internal time information is corrected based on the time information acquired in the second time measurement step in the time correction step. Normally, the two time information acquired in the second time measurement step match, so the internal time information is corrected in one of the two time information in the time correction step. Also, if the two time information acquired in the second time measurement step is different, for example, the internal time information is selected with one selected time information such as time information with high signal strength or time information close to the internal time information. Correct it.
As a result, the electronic clock continues to be unused, and the time information has not been acquired for several months since the previous time information was acquired. Can correct the internal time information correctly.

It is a front view which shows the electronic timepiece of this invention. It is a schematic sectional drawing of an electronic timepiece. It is a block diagram which shows the structure of an electronic timepiece. It is a figure explaining the structure of a navigation message. FIG. 3 is a diagram for explaining a configuration of a subframe 1. It is a block diagram which shows the structure of a memory | storage device. It is a flowchart which shows the reception process of the timekeeping mode in 1st Embodiment. It is a flowchart which shows the reception process of the timekeeping mode in 1st Embodiment. It is a flowchart which shows the reception process of the timekeeping mode in 2nd Embodiment. It is a flowchart which shows the reception process of the timekeeping mode in 2nd Embodiment. It is a flowchart which shows the reception process of the timekeeping mode in 3rd Embodiment. It is a flowchart which shows the reception process of the timekeeping mode in 3rd Embodiment.

Hereinafter, specific embodiments of the present invention will be described with reference to the drawings.
[First Embodiment]
FIG. 1 is a front view of an electronic timepiece 1 according to the first embodiment of the present invention, and FIG. 2 is a schematic cross-sectional view of the electronic timepiece 1.
As shown in FIG. 1, the electronic timepiece 1 acquires time information by receiving satellite signals from at least one GPS satellite 100 out of a plurality of GPS satellites 100 orbiting the earth over a predetermined orbit. The position information is calculated by receiving satellite signals from at least three GPS satellites 100. The GPS satellite 100 is an example of a position information satellite, and a plurality of GPS satellites 100 exist over the earth. Currently, about 30 GPS satellites 100 orbit.

[Electronic clock]
The electronic timepiece 1 is a wristwatch worn on a user's wrist, and includes a dial 11 and hands 12 (time display unit), and measures and displays the time.
Most of the dial plate 11 is formed of a non-metallic material (for example, plastic or glass) that easily transmits light and microwaves in the 1.5 GHz band.
The pointer 12 is provided on the surface side of the dial 11. The pointer 12 includes a second hand 121, a minute hand 122, and an hour hand 123 that rotate about the rotary shaft 13, and is driven by a step motor through a gear.

[Operation section operation]
In the electronic timepiece 1, processing corresponding to a manual operation of the input device (operation unit) 70 having the crown 14 and the buttons 15 and 16 is executed. Specifically, when the crown 14 is operated, a manual correction process for correcting the display time according to the operation is performed. When the button 15 is pressed for a long time (for example, 3 seconds or more), a manual reception process (forced reception process) for receiving satellite signals is executed.

Further, when the button 16 is pressed, a switching process for switching the reception mode (time measurement mode, positioning mode) is executed.
The time measurement mode is a mode in which one or more GPS satellites 100 are captured to receive satellite signals, and time information is acquired from the received satellite signals.

  The positioning mode is a mode in which three or more GPS satellites 100 are captured, satellite signals are received, and position information is acquired by performing positioning calculation based on the received satellite signals. In the positioning mode, the time information can usually be acquired simultaneously from the satellite signal. However, it is not necessary to acquire time information from the satellite signal in the positioning mode.

The setting of the reception mode by operating the button 16 is stored in the reception mode storage unit 660 of the storage device 60 described later. When the timekeeping mode is set, the second hand 121 moves to the “Time” position (5 second position). When the positioning mode is set, the second hand 121 is moved to the “Fix” position (10 Move to the second position). For this reason, the user can easily confirm the set reception mode.
Note that the reception mode is not limited to the one indicated by the second hand 121, and a pointer (mode hand) indicating the mode may be separately provided and displayed.

  Note that the reception mode may be fixed to the timekeeping mode or the positioning mode regardless of the mode set by the button 16 during the regular reception process described later, or the reception mode set by the button 16 during the regular reception process. You may control by. In this embodiment, as described later, the timed reception process is fixed to the timekeeping mode.

When the button 15 is pressed for a short time (for example, less than 3 seconds), a result display process for displaying the result of the previous reception process is performed. That is, when the reception is successful in the positioning mode, the second hand 121 moves to the position “Fix” (10-second position), and when the reception is successful in the time-measurement mode, the second hand 121 is “Time” (the 5-second position). ) Position. In the case of reception failure, the second hand 121 moves to the “N” position (20-second position).
Note that these instructions by the second hand 121 are also performed during reception. During reception in the positioning mode, the second hand 121 moves to the “Fix” position (10-second position), and during reception in the time-measurement mode, the second hand 121 moves to the “Time” position (5-second position). When the GPS satellite cannot be captured, the second hand 121 moves to the “N” position (20-second position).

[Structure of electronic watch]
As shown in FIG. 2, the electronic timepiece 1 includes an outer case 17 made of a metal such as stainless steel (SUS) or titanium. The exterior case 17 is formed in a substantially cylindrical shape. A surface glass 19 that covers the opening via a bezel 18 is attached to the opening on the surface side of the outer case 17. The bezel 18 is made of a non-metallic material such as ceramics in order to improve satellite signal reception performance. A back cover 20 is attached to the opening on the back side of the exterior case 17. Inside the outer case 17, a dial 11, a movement 21, a solar panel 22, a GPS antenna 23, a secondary battery 24, and the like are arranged.

  The movement 21 includes a drive mechanism 210 that drives the hands 12. The drive mechanism 210 includes a step motor, a wheel train 211, a drive circuit that drives the step motor, and the like. The step motor is composed of a motor coil 212, a stator, a rotor, and the like, and drives the pointer 12 via the train wheel 211 and the rotating shaft 13.

A circuit board 25 is disposed on the rear cover 20 side of the movement 21.
On the circuit board 25, the receiving device 30 that processes the satellite signal received by the GPS antenna 23, the control device 40 that performs various controls such as driving control of the receiving device 30 and the step motor, and the solar panel 22 generate electric power. A charging circuit 80 for charging power to the secondary battery 24 is attached. The receiving device 30 and the control device 40 are driven by electric power supplied from the secondary battery 24.

[solar panel]
The solar panel 22 is a photovoltaic element that performs photovoltaic generation that converts light energy into electrical energy. Although not shown, the solar panel 22 includes 7 to 8 solar cells, and these solar cells are connected in series and output.
As shown in FIG. 2, the solar panel 22 is supported by a solar panel support substrate 220. The solar panel support substrate 220 is a conductive substrate having a thickness dimension of, for example, 0.1 mm formed of a metal material such as BS (brass), SUS (stainless steel), or titanium alloy. As a result, the solar panel support substrate 220 functions as a part of the GPS antenna 23 with the same current distribution as that of the GPS antenna 23 arranged close to the solar panel support substrate 220.
The solar panel support substrate 220 is incorporated so as not to contact the outer case 17. That is, the solar panel support substrate 220 is arranged without the outer peripheral edge being separated from and contacting the inner peripheral surface of the exterior case 17.

  The dial plate 11 and the solar panel 22 are formed so that the outer peripheral diameters of the dial 11 and the inner peripheral diameter of the dial ring 140 are hidden by the dial ring 140, so that the solar panel support substrate 220 is visually recognized from the outside. It will never be done. Further, the outer dimensions of the solar panel support substrate 220 are larger than those of the solar panel 22 and the dial plate 11 and are expanded to the lower surface position of the GPS antenna 23.

[GPS antenna]
The GPS antenna 23 is a ring antenna including a ring-shaped dielectric base material 231 having a rectangular cross-sectional shape and having an antenna electrode 232 formed on the surface thereof.
The dielectric base material 231 shortens the wavelength of radio waves. For example, so-called micalex (εr = 6), which is ceramics mainly composed of alumina (εr = 8.5) or ceramics composed of mica, for example. 0.5 to 9.5), glass (εr = 5.4 to 9.9), diamond (εr = 5.68), and the like.

  The antenna electrode 232 is formed by printing a conductive metal element such as copper or silver on the surface of the dielectric substrate 231, or attaching a conductive metal plate such as silver or copper to the surface of the dielectric substrate 231. Are formed integrally with the dielectric base material 231 in a linear manner. The antenna electrode 232 may be formed by patterning the surface of the dielectric substrate 231 by electroless plating.

The connection pin 31 is in contact with the antenna electrode 232. The connection pin 31 is inserted into a substantially cylindrical connection base 32. The connection base 32 is connected to a printed wiring on the circuit board 25 and is erected.
The connection pin 31 and the connection base 32 are electrically connected to the receiving device 30 via printed wiring. The connection base 32 is provided with a biasing member such as a coil spring inside the cylinder, and biases the connection pin 31 inserted into the connection base 32 toward the antenna electrode 232 side. Thereby, the connection pin 31 is pressed against the feeding point of the antenna electrode 232, and the connection state between the connection pin 31 and the antenna electrode 232 is maintained even when, for example, an impact is applied to the electronic timepiece 1.

In this embodiment, the back cover 20 made of a conductive member also serves as a ground plate (reflecting plate) of the GPS antenna 23. The back cover 20 is electrically connected to a ground terminal 26 provided on the movement 21. The ground terminal 26 is connected to the ground potential of the receiving device 30 of the movement 21. For this reason, the back cover 20 is electrically connected to the ground potential of the receiving device 30 via the ground terminal 26, and a ground plate (reflective) that reflects radio waves incident from the surface glass 19 side toward the GPS antenna 23. Plate). Since the exterior case 17 of the conductive member that is in contact with the back cover 20 also has a ground potential, the exterior case 17 also functions as a ground plate.
Furthermore, since the back cover 20 and the outer case 17 are made of metal, in addition to functioning as a ground plate, the influence on the GPS antenna 23 when mounted on the user's arm can be avoided. That is, if the case is a plastic case, the resonance frequency of the GPS antenna 23 varies depending on the influence of the arm in the vicinity and when it is not worn, which is not preferable because of a performance difference. However, since the case is made of metal, the effect of the arm can be avoided by the shielding effect, and in this embodiment, there is almost no difference in antenna characteristics between when the sensor is mounted and when it is not mounted, and stable reception performance can be obtained. However, a plastic case can also be adopted.

[Secondary battery]
The secondary battery 24 is a power supply device for the electronic timepiece 1 and accumulates electric power generated by the solar panel 22.
In the electronic timepiece 1, the two electrodes of the solar panel 22 and the two electrodes of the secondary battery 24 can be electrically connected to each other by the two conductive coil springs 22A. The secondary battery 24 is charged by the photovoltaic power generation. In the present embodiment, a lithium ion secondary battery suitable for a portable device is used as the secondary battery 24. However, a lithium polymer battery or another secondary battery may be used. What is a secondary battery? Different power storage bodies (for example, capacitor elements) may be used.

[Circuit configuration of electronic watch]
FIG. 3 is a block diagram showing the configuration of the electronic timepiece 1. The electronic timepiece 1 includes a receiving device (receiving unit) 30, a control device (control unit) 40, a timing device (timer unit) 50, a storage device (storage unit) 60, and an input device (input unit, operation unit) 70. Yes.

[Receiver]
The receiving device 30 is a load driven by the electric power stored in the secondary battery 24, and receives a satellite signal transmitted from the GPS satellite 100 through the GPS antenna 23 when driven by the control device 40. Then, when the reception of the satellite signal is successful, the reception device 30 transmits information such as the acquired orbit information and GPS time information to the control device 40. On the other hand, when the reception of the satellite signal fails, the reception device 30 transmits information to that effect to the control device 40. Note that the configuration of the receiving device 30 is the same as the configuration of a known GPS receiving circuit, and a description thereof will be omitted. Here, “reception” refers to decoding navigation messages such as orbit information and GPS time information from the satellite signal of the captured GPS satellite 100.

[Navigation message]
FIG. 4A to FIG. 4C are diagrams for explaining the configuration of the navigation message included in the satellite signal received by the receiving device 30.
As shown in FIG. 4A, the navigation message is configured as data with a main frame of 1500 bits as a unit. The main frame is divided into five sub-frames 1 to 5 each having 300 bits. Data of one subframe is transmitted from each GPS satellite 100 in 6 seconds. Accordingly, data of one main frame is transmitted from each GPS satellite 100 in 30 seconds.

  Subframe 1 includes satellite correction data including a week number (WN) and satellite health (SVhealth) as shown in FIG. The week number is information representing a week including the current GPS time information. The starting point of the GPS time information is January 6, 1980, 00:00:00 in UTC (Coordinated Universal Time), and the week starting on this day is the week number 0. The week number is updated on a weekly basis.

  The satellite health state is a code indicating whether or not there is an abnormality in the satellite, and by checking this code, it is possible to control so as not to use the signal of the satellite with the abnormality. Specifically, when the health satellite status (SVhealth) is “0”, the navigation message is normal, and when the health satellite status (SVhealth) is “1”, some or all of the navigation messages are abnormal. Indicates that

Of the five sets of subframes, subframes 1 to 3 contain information unique to each satellite, so the same content is repeatedly transmitted each time. Specifically, it includes clock correction information and orbit information (ephemeris) of the transmitting satellite itself. On the other hand, subframes 4 and 5 include orbit information (almanac) and ionosphere correction information of all satellites, and these are divided into pages and accommodated in subframes because of the large number of data.
That is, the data transmitted in subframes 4 and 5 are each divided into pages 1 to 25, and the contents of different pages are sent in order for each frame. Since it takes 25 frames to transmit the contents of all pages, it takes 12 minutes and 30 seconds to receive all the information of the navigation message.

  Further, subframes 1 to 5 include, from the beginning, a TLM (Telemetry) word storing 30-bit TLM (Telemetry word) data and a HOW word storing 30-bit HOW (hand over word) data. It is.

  Accordingly, TLM words and HOW words are transmitted from the GPS satellite 100 at intervals of 6 seconds, whereas satellite correction data such as week numbers, ephemeris parameters, and almanac parameters are transmitted at intervals of 30 seconds.

  As shown in FIG. 4B, the TLM word includes preamble data, a TLM message, a reserved bit, and parity data.

  As shown in FIG. 4C, the HOW word includes GPS time information called TOW (Time of Week, also referred to as “Z count”). The Z count displays the elapsed time from 0 o'clock every Sunday in seconds and returns to 0 at 0 o'clock on the next Sunday. That is, the Z count is information in units of seconds indicated every week from the beginning of the week. This Z count indicates GPS time information at which the first bit of the next subframe data is transmitted. For example, the Z count of subframe 1 indicates GPS time information at which the first bit of subframe 2 is transmitted. The HOW word also includes 3-bit data (ID code) indicating the ID of the subframe.

The leap second information is stored in page 18 of subframe 4. That is, in the subframe 4 and page 18 of the satellite signal, “current leap second ΔtLS”, “leap second update week WNLSF”, “leap second update date DN”, “after update”, which are data relating to leap seconds. Each data of “leap second ΔtLSF” is stored.
The “leap second update week, leap second update date, and leap second after update” is information necessary for the next leap second update process. If it is decided to perform leap second update, these pieces of information are updated to new data about six months before the update date. The data remains after the leap second update is examined. For this reason, “current leap second ΔtLS” and “updated leap second ΔtLSF” have the same value until the execution of the next leap second update is determined. Therefore, it can be determined that if ΔtLS and ΔtLSF are the same value, there is no plan to update, and if they are different values, there is a plan to update.

Furthermore, since the time information (Z count) is stored in all subframes, it can be received at intervals of 6 seconds.
Therefore, when the calendar is not set, such as after a system reset, it is necessary to receive subframe 1 transmitted every 30 seconds, acquire the week number and satellite health status, and grasp the date information. . In addition, in order to calculate UTC from the GPS time calculated from the week number and the Z count, subframe 4 and page 18 transmitted every 12.5 minutes are received and information on “current leap second” is obtained. There is a need to.

  On the other hand, after acquiring the week number and the current leap second, the elapsed time from the time when the week number was acquired can be counted, so the acquired week number and elapsed time can be counted without acquiring the week number again. , You can see the current week number of the GPS satellite. Accordingly, if only the Z count is acquired, the current GPS time can be acquired, and UTC can be obtained by correcting the current leap second information.

[Time measuring device]
The time measuring device 50 includes a crystal resonator driven by the electric power stored in the secondary battery 24, and updates time data using a reference signal based on an oscillation signal of the crystal resonator.

[Storage device]
As shown in FIG. 6, the storage device 60 includes a time data storage unit 600, a reception mode storage unit 660, a time zone data storage unit 670, and a scheduled reception time storage unit 680.

  The time data storage unit 600 stores reception time data 610, leap second update data 620, internal time data 630, clock display time data 640, and time zone data 650.

  The reception time data 610 stores time information (GPS time information) acquired from satellite signals. This reception time data 610 is normally updated every second by the time measuring device 50, and is corrected by the acquired time information (GPS time information) when a satellite signal is received.

  The leap second update data 620 stores at least current leap second data. In addition, when each data of “leap second update week, leap second update date, leap second after update” is acquired, these data are also stored in the leap second update data 620.

  The internal time data 630 stores internal time information. This internal time information is updated by the GPS time information stored in the reception time data 610 and the “current leap second (leap second information)” stored in the leap second update data 620. That is, UTC (Coordinated Universal Time) is stored in the internal time data 630. When the reception time data 610 is updated by the timing device 50, the internal time information is also updated.

  The clock display time data 640 stores time data obtained by adding the time zone data (time zone information, time difference information) of the time zone data 650 to the internal time information of the internal time data 630. The time zone data 650 is set by position information obtained when received in the positioning mode.

  The reception mode storage unit 660 stores the reception mode set by operating the button 16 as described above.

  The time zone data storage unit 670 stores location information (latitude, longitude) and time zone information (time difference information) in association with each other. For this reason, when the position information is acquired in the positioning mode, the control device 40 can acquire the time zone data based on the position information (latitude, longitude).

  The time zone data storage unit 670 may further store a city name and time zone data in association with each other. In this case, when the user selects a city name to know the local time by operating the input device 70, the control device 40 searches the time zone data storage unit 670 for the city name set by the user, Time zone data corresponding to the city name may be acquired and set in the time zone data 650.

  The scheduled reception time storage unit 680 stores the scheduled reception time for executing the scheduled reception process in the first timing unit 411. As this scheduled reception time, the time when the forced reception was successful by operating the button 15 last time is stored.

[Control device]
The control device 40 is composed of a CPU that controls the electronic timepiece 1. The control device 40 includes a time measurement unit 410, a positioning unit 420, a time zone setting unit 430, a time zone correction unit 440, a time correction unit 450, a leap second acquisition unit 460, a leap second correction unit 470, A first determination unit 481 and a second determination unit 482 are provided.

[Timekeeping section]
The time measurement unit 410 operates the reception device 30 to perform reception processing in the time measurement mode. In this embodiment, the reception process in the timekeeping mode is executed by the automatic reception process and the manual reception process.
There are two types of automatic reception processing: scheduled automatic reception processing and optical automatic reception processing. In other words, the time measuring unit 410 operates the receiving device 30 in the time measuring mode when the time display data 640 that is timed reaches the time reception time stored in the time reception time storage unit 680. The scheduled automatic reception process is performed.
In addition, the time measuring unit 410 operates the receiving device 30 to measure time when the generated voltage or generated current of the solar panel 22 exceeds the set value and it can be determined that the solar panel 22 is irradiated with sunlight outdoors. Performs automatic optical reception in mode. Note that the number of processes for operating the receiving device 30 in the power generation state of the solar panel 22 may be limited to once a day.
Further, when the user presses the button 15 of the input device 70 and performs a forced reception operation in a state in which the time measurement mode is set, the time measurement unit 410 operates the reception device 30 to perform the operation in the time measurement mode. Perform manual reception processing.
Here, the time measuring unit 410 includes a first time measuring unit 411 and a second time measuring unit 412. When the reception process is started, first, the first time measuring unit 411 operates. Then, when the time information is not correctly acquired by the first time measuring unit 411, the second time measuring unit 412 operates. Specifically, the second timing unit 412 operates according to a determination result in a first determination unit 481 described later that determines whether or not the time information is correctly acquired in the first timing unit 411.

[First timekeeping section]
The first time measuring unit 411 starts the search (acquisition process) of the GPS satellite 100 by the reception device 30, causes the reception device 30 to receive a satellite signal transmitted from one captured GPS satellite 100, and receives the reception device 30. Obtains time information (Z count) from the received satellite signal.

[Second timekeeping section]
The second time measuring unit 412 causes the receiving device 30 to receive satellite signals transmitted from the two captured GPS satellites 100, and obtains time information (Z count) from the satellite signals received by the receiving device 30.

[Positioning part]
When the positioning unit 420 is set to the positioning mode and the user performs a forced reception operation by pressing the button 15 of the input device 70, the positioning unit 420 operates the reception device 30 to perform reception processing in the positioning mode. .
Note that the control device 40 does not depend on the reception mode stored in the reception mode storage unit 660, and the time measurement mode by the first time measurement unit 411 and the second time measurement unit 412 according to the time during which the button 15 is pressed. The reception process in the above and the reception process in the positioning mode by the positioning unit 420 may be switched and executed. For example, the control device 40 performs reception processing in the timekeeping mode when the button 15 is pressed for the first set time (3 seconds or more and less than 6 seconds), and is pressed for the second set time (6 seconds or more). Alternatively, reception processing in the positioning mode may be performed.

  When the positioning unit 420 starts reception processing in the positioning mode, the receiving device 30 captures at least three, preferably four or more GPS satellites 100, and receives satellite signals transmitted from the respective GPS satellites 100. Calculate and acquire location information. The positioning unit 420 can also acquire time information at the same time when a satellite signal is received.

[Time zone setting section]
When the positioning unit 420 succeeds in acquiring the position information, the time zone setting unit 430 sets time zone data based on the acquired position information (latitude, longitude). Specifically, time zone data (time zone information, that is, time difference information) corresponding to the position information is selected and acquired from the time zone data storage unit 670 and stored in the time zone data 650.
For example, since Japan Standard Time (JST) is a time (UTC + 9) that is 9 hours ahead of UTC, when the location information acquired by the positioning unit 420 is Japan, the time zone setting unit 430 Time difference information (+9 hours) in Japan standard time is read from the data storage unit 670 and stored in the time zone data 650.

[Time zone correction section]
When the time zone setting unit 430 sets time zone information, the time zone correction unit 440 corrects the clock display time data 640 using the time zone data. Therefore, the clock display time data 640 is a time obtained by adding the time zone data to the internal time data 630 which is UTC.

[Time correction section]
When the time correction unit 450 succeeds in acquiring time information in the reception processing of the first time measuring unit 411, the second time measuring unit 412, and the positioning unit 420, the time correcting unit 450 corrects the reception time data 610 with the acquired time information. For this reason, the internal time data 630 and the clock display time data 640 are also corrected. When the clock display time data 640 is corrected, the indication time of the hands 12 synchronized with the clock display time data 640 is also corrected by the hand position detecting means.

[Leap second acquisition part]
The leap second acquisition unit 460 receives leap second information when reception processing is performed by the first time measurement unit 411, the second time measurement unit 412, and the positioning unit 420 at a preset leap second reception time.
In this embodiment, the leap second reception time is set every six months. That is, at present, the update of leap seconds is at least every six months, and in recent years, it is about once a year to several years. The first priority date of the specific leap second update timing is the last day of December and June. Further, the leap second information includes information about the next leap second update date and the leap second after the update.
Therefore, if leap second information is received every six months (specifically, June and December), it can also be determined whether or not there is a leap second update schedule in the next six months.
Therefore, when the leap second acquisition unit 460 has the current month and day according to the internal time from June 1 to 30 and from December 1 to 31, the leap second has not been successfully received in that period. In addition, it is determined that the leap second reception time is reached, and the leap second information acquisition process is performed during the reception process in the first time measuring unit 411, the second time measuring unit 412, and the positioning unit 420.
Note that the leap second reception time may be half a year before the leap second update date, so it is not limited to June and December, but may be set every six months, such as July and January, August and February. That's fine.

Then, the leap second acquisition unit 460 acquires at least one GPS satellite 100 by the receiving device 30 and receives a satellite signal transmitted from the GPS satellite 100 to acquire leap second information. As described above, the leap second information is stored in the page 18 of the subframe 4 and transmitted at intervals of 12.5 minutes.
For this reason, when the leap second acquisition unit 460 operates the receiving device 30 to receive a satellite signal, the leap second acquisition unit 460 confirms the subframe or page of the satellite signal and grasps the timing at which the leap second information is transmitted next. . If the time until the leap second information is transmitted is short (for example, less than 60 seconds), the leap second acquisition unit 460 continues the reception and acquires the leap second information. If the time until the leap second information is transmitted is long (for example, 60 seconds or longer), the leap second acquisition unit 460 temporarily stops the reception process and resumes reception in accordance with the transmission timing of the leap second information.
The navigation message is managed on a weekly basis, and the transmission timing of leap second information is also determined. Therefore, the leap second acquisition unit 460 may perform reception at the leap second transmission timing based on the internal time data timed by the time measuring device 50.

[Leap second correction part]
The leap second correction unit 470 uses the leap second information acquired by the leap second acquisition unit 460 to correct the leap second information (current leap second) stored in the leap second update data 620.

[First determination unit]
The first determination unit 481 determines whether the time information has been correctly acquired by the first time measurement unit 411. Specifically, the first determination unit 481 corrects the time information (Z count) acquired by the first time measuring unit 411 with the leap second information stored in the leap second update data 620, and A difference from the internal time information stored in the internal time data 630 is calculated. Then, the first determination unit 481 determines whether or not the calculated difference is equal to or greater than a preset first predetermined value (for example, 60 seconds). Note that the time information obtained by correcting the time information acquired by the first time measuring unit 411 with leap second information corresponds to the time information acquired by the first time measuring unit 411 in the present invention.

[Second determination unit]
The second determination unit 482 determines whether the time information has been correctly acquired by the second time measuring unit 412. Specifically, the second determination unit 482 calculates a difference between the time information (Z count) acquired by the second time measuring unit 412, and is this difference equal to or less than a preset second predetermined value? Determine whether or not. Here, the second predetermined value is set to 0 seconds. That is, the second determination unit 482 determines whether or not the difference between the acquired time information matches.

[Operation of control device]
7 and 8 are flowcharts showing reception processing in the timekeeping mode of the electronic timepiece 1 in the first embodiment.
The processing shown in FIGS. 7 and 8 is performed when the electronic timepiece 1 is set to the timekeeping mode and the conditions of the above-described automatic reception processing (scheduled automatic reception processing and optical automatic reception processing) are met, and are used. This is started when a forced reception operation for time measurement is performed by a person.
First, the control device 40 activates the first time measuring unit 411 of the time measuring unit 410 to start the one satellite reception mode (SA11). Then, the first time measuring unit 411 activates the receiving device 30 and starts searching for the GPS satellite 100 (SA12).

  Next, the first time measuring unit 411 determines whether or not the elapsed time since the start of the search for the GPS satellite 100 at SA12 has exceeded a preset time (for example, 30 seconds). It is determined whether or not (SA13). In an environment where the GPS satellite 100 having a relatively strong signal level can be captured, the GPS satellite 100 can be captured in about 2 seconds. Therefore, when it is determined that the time-out has occurred (Yes in SA13), the first time measuring unit 411 determines that the electronic timepiece 1 is not in an environment in which the satellite signal can be received, and stops the satellite signal reception process (SA14). The process is terminated.

  When it is determined in SA13 that it is not a timeout (No in SA13), the first time measuring unit 411 determines whether one GPS satellite 100 has been captured (SA15). When it is determined that one GPS satellite 100 has not been captured (No in SA15), the first time measuring unit 411 returns the process to SA13.

  When it is determined in SA15 that one GPS satellite 100 has been captured (Yes in SA15), the first time measuring unit 411 causes the receiving device 30 to receive a satellite signal transmitted from the captured one GPS satellite 100. The Z count is acquired from the satellite signal received by the receiving device 30 (SA16).

  Next, the first time measuring unit 411 determines whether or not the Z count has been successfully acquired in SA16 (SA17). When it is determined that the Z count has not been successfully acquired (No in SA17), the first time measuring unit 411 ends the satellite signal reception process (SA14) and ends the process.

When it is determined in SA17 that the Z count has been successfully acquired (Yes in SA17), the first determination unit 481 corrects the Z count acquired in SA16 with leap second information and internal time data 630. The difference from the internal time information stored in is calculated. Then, it is determined whether or not the difference is greater than or equal to a preset first predetermined value (for example, 60 seconds) (SA18).
Here, if the difference is less than the first predetermined value, it is unlikely that the received satellite signal is affected by noise, and it can be determined that the Z count was correctly acquired in SA16. On the contrary, if the difference is greater than or equal to the first predetermined value, it is highly likely that the received satellite signal has been affected by noise, and the Z count has not been correctly acquired in SA16, or the internal time information Can be determined to be greatly deviated from the current time.

  When it is determined in SA18 that the difference is less than the first predetermined value (No in SA18), the first time measuring unit 411 ends the satellite signal reception process (SA19). Then, the time correction unit 450 corrects the reception time data 610 based on the Z count acquired at SA16. For this reason, the internal time data 630 and the clock display time data 640 are also corrected. That is, the internal time information stored in the internal time data 630 is corrected (SA20). Thereafter, the first determination unit 481 ends the process.

On the other hand, when it is determined in SA18 that the difference is equal to or greater than the first predetermined value (Yes in SA18), the first time measuring unit 411 discards the Z count acquired in SA16 (SA21).
Next, the control device 40 operates the second timing unit 412 to shift to the multiple satellite reception mode (SA22). Then, the second time measuring unit 412 determines whether or not at least two GPS satellites 100 have been captured by the receiving device 30 (SA23).
That is, the search for the GPS satellites 100 started at SA12 is continued until at least two GPS satellites 100 are captured, except when the satellite signal reception process is terminated at SA14 and SA19. That is, the control device 40 has two or more acquisition channels (for example, 12) of the GPS satellites 100, and the search for the GPS satellites 100 is continued until the GPS satellites 100 are acquired by the number of acquisition channels. .

  If it is determined in SA23 that at least two GPS satellites 100 have not been captured (No in SA23), the second time measuring unit 412 determines that the elapsed time since the search for the GPS satellite 100 is started in SA12 It is determined whether or not a set time (for example, 120 seconds) has been exceeded, and it is determined whether or not a timeout has occurred (SA24). When it is determined that a time-out has occurred (Yes in SA24), the second timing unit 412 ends the satellite signal reception process (SA25), and ends the process. On the other hand, when it is determined that the time-out has not occurred (No in SA24), the second timing unit 412 returns the process to SA23.

On the other hand, if it is determined in SA23 that at least two GPS satellites 100 have been captured (Yes in SA23), the second timing unit 412 receives satellite signals transmitted from the two captured GPS satellites 100. The Z-count is acquired from each satellite signal received by the receiving device 30 and received by the receiving device 30 (SA26). That is, the second time measuring unit 412 acquires two Z counts.
At this time, when three or more GPS satellites 100 can be captured, the second time measuring unit 412 selects the two GPS satellites 100 having the higher signal strength, and is transmitted from the selected GPS satellites 100. The receiving device 30 receives the satellite signal.

  Next, the second time measuring unit 412 determines whether or not two Z counts have been successfully acquired in SA26 (SA27). When it is determined that the acquisition of the two Z counts has not been successful (No in SA27), the second timing unit 412 ends the satellite signal reception process (SA25), and ends the process.

When it is determined in SA27 that acquisition of two Z counts has been successful (Yes in SA27), the second determination unit 482 calculates a difference between the two Z counts acquired in SA26, and this difference is calculated in advance. It is determined whether or not the second predetermined value or less is set (SA28). Here, the second predetermined value is set to 0 seconds. That is, the second determination unit 482 determines whether the acquired time information matches.
Here, when the difference between the Z counts is equal to or less than the second predetermined value, it is unlikely that the received satellite signal is affected by noise, and it can be determined that the Z count was correctly acquired in SA26. On the contrary, when the difference between the Z counts is larger than the second predetermined value, it is highly possible that the received satellite signal is affected by noise, and it can be determined that the Z count cannot be acquired correctly at SA26. .
When it is determined that the difference between the Z counts is greater than the second predetermined value (No in SA28), the second time measuring unit 412 ends the satellite signal reception process (SA25) and ends the process.

If it is determined in SA28 that the difference between the Z counts is equal to or smaller than the second predetermined value (Yes in SA28), the second time measuring unit 412 ends the satellite signal reception process (SA29).
Then, the time correction unit 450 corrects the reception time data 610 based on one of the two Z counts acquired at SA26. For this reason, the internal time data 630 and the clock display time data 640 are also corrected. That is, the internal time information stored in the internal time data 630 is corrected (SA30). Thereafter, the time correction unit 450 ends the process.

According to such 1st Embodiment, the following effects are obtained.
When the difference (time difference) between the time information obtained by correcting the time information (Z count) acquired by the first time measuring unit 411 with the leap second information and the internal time information is less than a first predetermined value (for example, 60 seconds). (No in SA18), the acquired time information is highly likely to be the correct time, and it can be determined that the time information has been acquired correctly by the first time measuring unit 411. For this reason, internal time information can be corrected with the time information acquired by the 1st time measuring part 411 (SA20). In this case, since the second time measuring unit 412 does not operate, the receiving device 30 only needs to receive the satellite signal of one GPS satellite 100.
That is, according to the present embodiment, when the difference is less than the first predetermined value (No in SA18), the internal time information can be corrected only by causing the receiving device 30 to receive the satellite signal of one GPS satellite 100. . Then, when the correct time information cannot be obtained by the first time measuring unit 411, or when the difference is greater than or equal to the first predetermined value, such as when the internal time information is greatly deviated from the current time (Yes in SA18). First, the second time measuring unit 412 is activated, and the receiving device 30 receives the satellite signals of the two GPS satellites 100.
Thereby, the frequency with which the receiving device 30 receives the satellite signals of the two GPS satellites 100 can be reduced, and the consumption due to the reception of the satellite signals compared to the case where the receiving device 30 receives the satellite signals of the two GPS satellites 100 each time. The average value of electric power can be reduced.

In addition, when the first time measuring unit 411 cannot acquire correct time information, or when the internal time information is greatly deviated from the current time, the leap second information of the time information acquired by the first time measuring unit 411 is used. When the difference between the time information corrected in step 1 and the internal time information is greater than or equal to the first predetermined value (Yes in SA18), the second time measuring unit 412 acquires time information from the satellite signals of the two GPS satellites 100. (SA26). And the 2nd determination part 482 determines whether the difference (time difference) between the time information acquired by the 2nd time measuring part 412 is below a 2nd predetermined value (SA28). Here, if the difference between the time information is equal to or smaller than the second predetermined value, it can be determined that the time information is correctly acquired. When the second determination unit 482 determines that the difference is equal to or less than the second predetermined value (Yes in SA28), the time correction unit 450 is based on the time information acquired by the second time measurement unit 412. Correct internal time information.
As a result, the electronic timepiece 1 remains unused, and the time information has not been acquired for several months since the acquisition of the previous time information, so that the internal time information is largely deviated from the current time. However, the internal time information can be corrected correctly.

Further, when acquiring the time information, the first time measuring unit 411 starts the capturing process of the GPS satellite 100 by the receiving device 30 (SA12), and until the receiving device 30 captures at least two GPS satellites 100, Continue the acquisition process.
According to this, since the capturing process is continued until at least two GPS satellites 100 are captured after the first time measuring unit 411 starts receiving, when the second time measuring unit 412 acquires time information. This eliminates the need for the receiving device 30 to execute the acquisition process of the GPS satellite 100 again. Therefore, the capturing process of the GPS satellite 100 is stopped as compared with the case where the capturing process is stopped when the first time measuring unit 411 captures one GPS satellite 100 and the capturing process is started again by the second time measuring unit 412. Time can be shortened and reception processing time can be shortened.

In addition, since the first time measuring unit 411 and the second time measuring unit 412 acquire the Z count with a short signal interval, the time information can be acquired in a short time, and the time required for correcting the internal time information can be shortened.
Note that when correcting the internal time information based only on the Z count, the date cannot be corrected. However, the accuracy of the quartz clock is unlikely to shift to date information, and there is no practical problem even if the date cannot be corrected.

[Second Embodiment]
Next, 2nd Embodiment of this invention is described based on drawing.
In addition, since structures other than the 2nd time measuring part 412 and the 2nd determination part 482 of the electronic timepiece of this embodiment are the same as that of 1st Embodiment, the description is abbreviate | omitted.
In the first embodiment, the second time measuring unit 412 obtains time information (Z count) from the satellite signal received by the receiving device 30. In the second embodiment, information (week number) indicating date is also acquired as time information.
In the first embodiment, the second determination unit 482 determines whether or not the time information is correctly acquired by the second time measuring unit 412 by comparing the difference between the Z counts with the second predetermined value. However, in the second embodiment, the difference between the Z count and the week number is determined by comparing with the second predetermined value.

9 and 10 are flowcharts showing the reception processing in the timekeeping mode of the electronic timepiece according to the second embodiment.
As shown in FIGS. 9 and 10, the control device 40 performs the processes of SB11 to SB25, SB29, and SB31 to SB34. Here, the processes of SB11 to SB22 and SB29 are the same processes as SA11 to SA25 and SA29 in the first embodiment, and thus description thereof is omitted.

In 1st Embodiment, when it determines with Yes by SA23, the 2nd time measuring part 412 makes the receiving device 30 receive the satellite signal transmitted from two captured GPS satellites 100, and the receiving device 30 receives it. The Z count is acquired from each satellite signal (SA26).
On the other hand, in 2nd Embodiment, when it determines with Yes in SB23, the 2nd time measuring part 412 makes the receiving device 30 receive the satellite signal transmitted from two captured GPS satellites 100, The Z count and week number are acquired from each satellite signal received by the receiving device 30 (SB31). That is, the second time measuring unit 412 acquires two Z counts and week numbers.

  Next, the second time measuring unit 412 determines whether or not two SB counts and week numbers have been successfully acquired in SB31 (SB32). When it is determined that the acquisition of the two Z counts and the week number has not been successful (No in SB32), the second time measuring unit 412 ends the satellite signal reception process (SB25) and ends the process.

When it is determined in SB32 that acquisition of two Z counts and week numbers has been successful (Yes in SB32), the second determination unit 482 calculates the difference between the two Z counts acquired in SB31 and the week numbers. Then, it is determined whether or not the difference is equal to or less than the second predetermined value (0 seconds) (SB33). That is, the second determination unit 482 determines whether the date and time and the hour / minute / second match between the two pieces of time information acquired in SB31.
When it is determined that the difference between the Z count and the week number is greater than the second predetermined value (No in SB33), that is, when the date and time do not match between the two time information, the second time measurement The unit 412 ends the satellite signal reception process (SB25), and ends the process.

When it is determined in SB33 that the difference between the Z count and the week number is equal to or smaller than the second predetermined value (Yes in SB33), that is, when the date and time match between the two pieces of time information, The second time measuring unit 412 ends the satellite signal reception process (SB29).
Then, the time correction unit 450 corrects the reception time data 610 based on the Z count and week number acquired in SB31. For this reason, the internal time data 630 and the clock display time data 640 are also corrected. That is, the internal time information stored in the internal time data 630 is corrected (SB34). Thereafter, the time correction unit 450 ends the process.

  According to such 2nd Embodiment, the same effect is obtained by the same process as 1st Embodiment, and also the following effects are obtained.

The time information determined by the second determination unit 482 (SB33) is the Z count and the week number. For this reason, the amount of information to be determined can be increased and the determination reliability can be improved as compared with the case where the determination is performed based only on the Z count. That is, even if the hour, minute, and second match between the two time information acquired in SB31, if any of the date and time does not match, it can be determined that at least one of the two time information is incorrect.
Further, since the internal time information is corrected based on the Z count and the week number (SB34), the year, month, day, and day of week can be corrected in addition to the hour, minute, and second.

[Third Embodiment]
Next, 3rd Embodiment of this invention is described based on drawing.
In addition, since the structure of the electronic timepiece of this embodiment is the same as that of the first embodiment, the description thereof is omitted.
In the first embodiment, the search for the GPS satellite 100 started by the first time measuring unit 411 is continued even after capturing one GPS satellite 100, but in the third embodiment, the first time measuring unit 411 is used. The search of the GPS satellite 100 started by the operation stops when one GPS satellite 100 is acquired.

FIG. 11 and FIG. 12 are flowcharts showing reception processing in the timekeeping mode of the electronic timepiece according to the third embodiment.
As shown in FIGS. 11 and 12, the control device 40 performs the processes of SC11 to SC30, SC35, and SC36. Here, since the process of SC11-SC30 is the same process as SA11-SA30 in 1st Embodiment, description is abbreviate | omitted.

In 1st Embodiment, when it determines with Yes by SA15, the 1st time measuring part 411 has advanced the process to SA16.
On the other hand, in 3rd Embodiment, when it determines with Yes by SC15, the 1st time measuring part 411 controls the receiver 30 and stops the search of the GPS satellite 100 (SC35), and after that, The process proceeds to SC16.

In the first embodiment, the process proceeds to SA23 after SA22.
On the other hand, in 3rd Embodiment, after SC22, the 2nd time measuring part 412 operates the receiver 30 and starts the search of the GPS satellite 100 (SC36). Thereafter, the second timing unit 412 advances the process to SC23.

According to such 3rd Embodiment, the same effect is obtained by the same process as 1st Embodiment, and the following effects are obtained.
When the first time measuring unit 411 acquires the Z count, the GPS satellite 100 capturing process stops when the receiving device 30 captures one GPS satellite 100. Thereby, in particular, the internal time information can be corrected with the time information acquired by the first time measuring unit 411, and when there is no need to operate the second time measuring unit 412, the time for the capturing process can be shortened. Power consumption can be reduced.
Here, in normal use environment, the time information can be correctly acquired from the GPS satellite 100, and the internal time information rarely deviates greatly from the current time. Therefore, in most cases, the first time measuring unit 411 acquires the time information. It can be assumed that the difference between the time information obtained by correcting the corrected time information with leap second information and the internal time information is less than the first predetermined value. For this reason, there are few opportunities for the 2nd time measuring part 412 to operate. That is, according to the third embodiment, in many cases, the capturing process of the GPS satellite 100 stops when the receiving device 30 captures one GPS satellite 100, so that the power consumption of the electronic timepiece 1 can be significantly reduced. .

[Other Embodiments]
In addition, this invention is not limited to the structure of each said embodiment, A various deformation | transformation implementation is possible within the range of the summary of this invention.
For example, in the above embodiment, the second predetermined value is set to 0 seconds, but may be set to a number of seconds greater than 0 seconds (for example, 10 seconds).
In this case, the time correcting unit 450 selects one of the two pieces of time information acquired by the second time measuring unit 412 such as time information with high signal intensity or time information close to the internal time information. To correct the internal time information.
The second predetermined value may be the same number of seconds as the first predetermined value, but the time information acquired simultaneously from a plurality of GPS satellites 100 is usually the same and the difference is 0 seconds. A shorter number of seconds is better.

  In the embodiment, the first determination unit 481 corrects the time information acquired by the first time measuring unit 411 with the leap second information stored in the leap second update data 620, and the internal time. Although the difference with the internal time information memorize | stored in the data 630 is calculated, the 1st determination part is the time information acquired by the 1st time measuring part 411, and the time memorize | stored in the reception time data 610. A difference from the information may be calculated.

In the embodiment, the second time measuring unit 412 receives the satellite signals of the two GPS satellites 100 in the receiving device 30 and acquires the two pieces of time information. The satellite signal of the GPS satellite 100 may be received to acquire three or more pieces of time information. In this case, the second determination unit 482 may select any two pieces of time information and determine whether the difference between them is equal to or less than the second predetermined value. Moreover, you may make it determine whether the difference of the two most distant time information among 3 or more time information is below a 2nd predetermined value.
In the second embodiment, the second determination unit 482 determines the information indicating the hour / minute / second and the information indicating the date with the same second predetermined value. It may be used. For example, the information indicating the hour, minute, and second may be 10 seconds, and the information indicating the date may be 0 seconds (match).

  In the above embodiment, the GPS satellite has been described as an example of the position information satellite. However, as the position information satellite of the present invention, not only the GPS satellite but also Galileo (EU), GLONASS (Russia), Hokuto (China), etc. Other global navigation satellite systems (GNSS), geostationary satellites such as SBAS, and position information satellites that transmit satellite signals including time information such as quasi-zenith satellites may be used.

  The electronic timepiece of the present invention is not limited to a wristwatch, for example, an electronic device having a mechanism for receiving a satellite signal and correcting the internal time, such as a portable clock receiver used for a table clock, a wall clock, a mobile phone, and a mountain climber. Widely available for watches.

  DESCRIPTION OF SYMBOLS 1 ... Electronic timepiece, 30 ... Receiving device (reception part), 50 ... Time measuring device (timer part), 100 ... GPS satellite (position information satellite), 411 ... 1st time measuring part, 412 ... 2nd time measuring part, 450 ... time correction unit, 481 ... first determination unit, 482 ... second determination unit.

Claims (7)

A receiver for receiving satellite signals;
A timekeeping section that keeps internal time information,
A first time measuring unit for causing the receiving unit to receive a satellite signal of one position information satellite and acquiring time information from the satellite signal received by the receiving unit;
A first determination unit that determines whether or not a difference between the time information acquired by the first time measurement unit and the internal time information is equal to or greater than a first predetermined value;
When the first determination unit determines that the difference is greater than or equal to the first predetermined value, the reception unit receives satellite signals of at least two position information satellites, and the reception unit receives the at least two A second time measuring unit for obtaining at least two pieces of time information from satellite signals of the position information satellite;
A second determination unit that determines whether or not a difference between the at least two pieces of time information acquired by the second time measuring unit is equal to or less than a second predetermined value;
A time correction unit that corrects the internal time information based on the time information acquired by the second time measurement unit when the second determination unit determines that the difference is equal to or less than the second predetermined value; An electronic timepiece characterized by comprising: The electronic timepiece according to claim 1,
The first time measuring unit starts the acquisition process of the position information satellite by the reception unit, and continues the acquisition process until the reception unit acquires at least two position information satellites. clock. The electronic timepiece according to claim 1,
The electronic timepiece characterized in that the first time measuring unit starts the capturing process of the position information satellite by the receiving unit, and stops the capturing process when the receiving unit captures one position information satellite. The electronic timepiece according to any one of claims 1 to 3,
The time information acquired by the first time measuring unit is information indicating hour, minute and second. An electronic timepiece. The electronic timepiece according to any one of claims 1 to 4,
The time information acquired by the second time measuring unit is information indicating hour, minute and second. An electronic timepiece. The electronic timepiece according to any one of claims 1 to 4,
The time information acquired by the second time measuring unit is information indicating hour, minute, second and year / month / day. A reception control method for an electronic timepiece having a receiver for receiving satellite signals and a timer for timing internal time information,
A first time measuring step of causing the receiving unit to receive a satellite signal of one position information satellite and acquiring time information from the satellite signal received by the receiving unit;
A first determination step of determining whether or not a difference between the time information acquired in the first time measurement step and the internal time information is equal to or greater than a first predetermined value;
When it is determined in the first determination step that the difference is greater than or equal to the first predetermined value, the reception unit receives satellite signals of at least two position information satellites, and the reception unit receives the at least two A second time measuring step of acquiring at least two pieces of time information from the satellite signal of the position information satellite;
A second determination step of determining whether or not a difference between the at least two pieces of time information acquired in the second time measurement step is equal to or less than a second predetermined value;
A time correction step of correcting the internal time information based on the time information acquired in the second time measurement step when it is determined in the second determination step that the difference is equal to or less than the second predetermined value; An electronic timepiece reception control method comprising:

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