JP2001013279A - Standard clock device using msas signal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a standard clock device capable of using in all Japan with a relatively simple correction. SOLUTION: MSAS signal resonating with GPS time with high accuracy broadcast by MTSAT 31 is received with a receiver 32, a standard signal resonating with the GPS time and time information from the standard clock 34 is corrected with an automatic corrector 33.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a standard timepiece, and more particularly to an MSAS (Multi-Functional Transport Satellite).
e-based Augmentation System).

[0002]

2. Description of the Related Art Broadcasting stations and broadcast relay vehicles require extremely accurate standard times for broadcasting and relaying programs.
It is common to have a standard clock. As a prior art for obtaining such a standard timepiece, for example, Japanese Patent Application Laid-Open No. 4-30739
Japanese Patent Application Laid-Open Publication No. 4 (1998) -314, and "Time information management system" disclosed in JP-A-10-31886 have been proposed.

[0003] As shown in FIG.
Clock body 21, GPS (Global Positioning System)
m) receiving device 22, time setting device 23, determining device 24,
It comprises a storage device 25 and a computing device 26. The storage device 25 previously stores the longitude of a place such as a city which is the basis of the standard time in each region by dividing the earth into several regions. Based on the user's position information measured by the GPS receiver 22, the determination device 24 determines which position the user is in from the position information. When the position changes, the longitude of the city serving as the standard time of the place is selected and calculated from the longitude of the city serving as the standard time stored in the storage device 25 in the area where the user is located. Transmit to the device 26.
Therefore, the arithmetic unit 26 transmits the signal to the GPS receiver 2
The standard time is calculated from the position information obtained in step 2 and output to the time setting device 23. This time setting device 23
The standard time obtained by the arithmetic unit 26 is received and the clock
Automatically reset to 1.

Next, the latter time information management system 1
As shown in FIG. 5, a time information signal generating means 2, a time information adjusting means 3, and a second time measuring means 5 which is a plurality of time measuring means.
.., 5-n. The time information adjusting means 3 includes a receiving means 9, a standard time information extracting means 6, a standard time correcting means 7, a first time measuring means 4, a time information output means 8, and a medium changing means 10. The time information signal generating means 2 generates a time information signal including standard time information. The time information adjusting means 3 receives the above-mentioned standard time information from the time information signal generating means 2 at the receiving means, and the standard time information is transmitted to the medium changing means 10 by radio wave, light, wire,
A plurality of second timing means 5-
,..., 5-n are output from the time information output means 8.

[0005]

However, in the above-mentioned prior art, the GPS receiver and other components are complicated and expensive. Further, in the time information management system, there is a problem that the radio wave is transmitted between the time information signal generating means and the receiving means, so that stable reception is not always possible at any time and anywhere.

It is an object of the present invention to provide a standard clock device using an MSAS signal which solves or reduces the above-mentioned problems of the prior art.

[0007]

In order to solve the above-mentioned problems, a standard clock device based on an MSAS signal according to the present invention comprises:
The following characteristic configuration is adopted.

(1) A standard clock device for calibrating time information from a standard clock by an automatic calibrating unit based on a reference signal. A standard clock device based on an MSAS signal, wherein a reference signal received by a receiving unit and synchronized with the GPS time is output to the automatic calibration unit.

(2) The MSAS receiving section also uses a reference signal synchronized with GPS time obtained from a signal from a GPS satellite and complements the MSAS signal from the MTSAT by using the standard based on the MSAS signal of (1). Clock device.

(3) The reference signal synchronized with the GPS time obtained by the signal from the MTSAT and the reference signal synchronized with the GPS time obtained by the signal from the GPS satellite are compared with each other, and a reference signal exceeding an allowable value is compared. (2) The standard clock device using the MSAS signal according to the above (2).

(4) An MSAS receiving unit for receiving an MSAS signal synchronized with the GPS time from the MTSAT, and outputting a reference signal synchronized with the MSAS signal, and transmitting time information from a standard clock to the MSAS receiving unit from the MSAS receiving unit. A standard clock device based on a MSAS signal, the standard clock device having an automatic calibration unit for calibrating based on a reference signal.

(5) GP output from the automatic calibration unit
The standard clock device based on the MSAS signal according to the above (4), further comprising a time signal processing unit for converting a precise standard time signal synchronized with the S time.

(6) The standard timepiece according to the above (4) or (5), wherein the standard timepiece outputs a time signal of the same accuracy as a commercially available timepiece.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a standard clock device using an MSAS signal according to the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 is a block diagram of a first embodiment of a standard timepiece apparatus using an MSAS signal according to the present invention. The standard clock device 30 based on the MSAS signal in FIG.
T (Multifunctional Transport Satellite) 31,
It comprises an MSAS receiving unit 32, an automatic calibration unit 33, a standard clock 34, and a time signal processing unit 35.

The MTSAT 31 is an artificial satellite covering the whole of Japan, and transmits a modulated MSAS signal of the same type as GPS at the GPS L1 frequency. The MSAS receiving unit 32 includes an antenna (antenna) that receives the above-described MSAS signal from the MTSAT 31. This M
The SAS receiving unit 32 processes the received MSAS signal, and outputs the GPS time and the reference signal (1) synchronized with the GPS time.
PPS). Next, the automatic calibration unit 33
The time information from the standard clock 34 is calibrated by the GPS time from the S receiving unit 32 and the reference signal (1PPS) synchronized with the GPS time.

The GPS time is similar to the international atomic time, and has a difference of an exact integer second from the time used in daily life, but can be used as an accurate reference time. The standard clock 34 outputs a time signal with the same accuracy as a commercially available clock. The time signal processing unit 35 outputs an accurate standard time signal synchronized with the GPS time output from the automatic calibration unit 33,
For example, the signal is converted into a signal that can be used in broadcasting equipment and output. Since MTSAT31 is well known to those skilled in the art,
Here, detailed description is omitted.

Next, the operation of the first embodiment of the standard clock device 30 based on the MSAS signal of the present invention shown in FIG. 1 will be described with reference to the timing chart of FIG. 2A shows a reference signal synchronized with the GPS time, that is, 1 PPS, FIG. 2B shows the GPS time, and FIG. 2C shows the Japanese standard time. (D) and (e) are 1PPS and Japan Standard Time respectively calibrated by the automatic calibration unit 33.

The MSAS signal from MTSAT 31 is MS
When received by the AS receiver 32, the MSAS receiver 32
Demodulates the MSAS signal and supplies a reference signal synchronized with the GPS time to the automatic calibration unit 33. Therefore, the automatic calibration unit 33 calibrates the time information from the standard clock 34 with the reference signal 1PPS synchronized with the GPS time, and supplies the time information to the time signal processing unit 35.

FIG. 3 is a block diagram of a second embodiment of the standard clock device using the MSAS signal according to the present invention. Note that the same reference numerals are used for components corresponding to those of the standard timepiece device 30 based on the MSAS signal in FIG.

Standard clock device 3 based on the MSAS signal in FIG.
0A is an MTSAT 31, a MSAS receiving unit 32, an automatic calibration unit 33, a standard clock 34, a time signal processing unit 35, and a GP.
An S satellite 36 is provided. As is apparent from the correspondence with the standard clock device 30 based on the MSAS signal in FIG.
The standard clock device 30A based on the SAS signal has a configuration similar to the standard clock device 30 based on the MSAS signal, but further devises a source for acquiring the reference signal. In the standard clock device 30 using the MSAS signal, the GPS satellite 36 can be used not only as a substitute for the MTSAT 31 but also by using signals from a plurality of satellites to obtain the reliability of the reference signal synchronized with the acquired GPS time. Performance can be improved.

The MSAS receiving unit 32 separates a GPS signal obtained from a signal from a GPS satellite 36 apart from a reference signal synchronized with GPS time obtained from a signal from the MTSAT 31.
The reference signal synchronized with the GPS time obtained by the signal from the satellite 36 is compared. As a result, if there is a difference exceeding a certain allowable value, the reference signal is disabled, a plurality of independent processing results are compared, and the deviated processing results are rejected. 3
The reliability of the reference signal obtained at 0 A can be improved. In this manner, the MS from the MTSAT 31 is
By complementing the AS signal, the reliability of the reference signal can be improved.

The preferred embodiment of the standard clock device using the MSAS signal of the present invention has been described above. However, this is merely an example, and it is a matter of course that various modifications can be made in accordance with a specific application. .

[0024]

As will be understood from the above description, according to the standard clock device using the MSAS signal of the present invention, the following various remarkable effects can be obtained.

First, since the MSAS signal broadcast by the MTSAT can be received throughout Japan, for example, an outdoor broadcast truck can easily receive a stable reference signal in a place with good visibility. is there.

Second, since the reference signal synchronized with the GPS time obtained from the MSAS signal has high accuracy, time operation synchronized with high accuracy can be performed even in geographically distant places.
In particular, it is suitable for a device that moves outdoors such as a relay truck.

Third, it is possible to improve the reliability of the reference signal by using a plurality of satellites such as GPS satellites together with MTSAT and complementing the MSAS signal from MTSAT.

[Brief description of the drawings]

FIG. 1 is a block diagram of a first embodiment of a standard clock device using an MSAS signal according to the present invention.

FIG. 2 is a timing chart for explaining the operation of the standard timepiece device based on the MSAS signal of FIG. 1;

FIG. 3 is a block diagram of a second embodiment of a standard timepiece apparatus using an MSAS signal according to the present invention.

FIG. 4 is a block diagram of a conventional timepiece device.

FIG. 5 is a block diagram of a conventional clock information management system.

[Explanation of symbols]

 30, 30A Standard time device based on MSAS signal 31 MTSAT 32 MSAS receiving unit 33 Automatic calibration unit 34 Standard clock 35 Time signal processing unit 36 GPS satellite

Claims (6)

[Claims] 1. A standard clock device for calibrating time information from a standard clock by an automatic calibration unit based on a reference signal, wherein the MSAS signal from the MTSAT that broadcasts the MSAS signal synchronized with GPS time with high accuracy is received. A standard clock device based on an MSAS signal, wherein a reference signal received by a unit and synchronized with the GPS time is output to the automatic calibration unit. 2. The MSAS receiving unit according to claim 1, wherein the MSAS receiving unit also uses a reference signal synchronized with GPS time obtained from a signal from a GPS satellite to complement the MSAS signal from the MTSAT. Standard clock device by MSAS signal. 3. G obtained by a signal from the MTSAT.
3. A reference signal synchronized with a PS time and a reference signal synchronized with a GPS time obtained by a signal from the GPS satellite are compared, and a reference signal exceeding an allowable value is disabled. A standard clock device based on the described MSAS signal. 4. M synchronized with GPS time from MTSAT
An MSAS receiving unit for receiving a SAS signal and outputting a reference signal synchronized with the MSAS signal; and an automatic calibration unit for calibrating time information from a standard clock based on the reference signal from the MSAS receiving unit. A standard clock device based on the MSAS signal. 5. The MS according to claim 4, further comprising a time signal processing unit for converting an accurate standard time signal synchronized with the GPS time output from the automatic calibration unit.
Standard clock device by AS signal. 6. The standard timepiece apparatus according to claim 4, wherein the standard timepiece outputs a time signal with the same accuracy as a commercially available timepiece.