JPH06308218A - Gps receiving device - Google Patents

Abstract

PURPOSE:To simply provide the detailed and newest map without carrying a memory medium by connecting a modem section to a public telephone network via a cellular telephone, and receiving the detailed map data from a data bank. CONSTITUTION:When a modem section 8 is connected to a public telephone network via a cellular telephone, a communication controller 8 is connected to a data base. When the map data menu of the data base is called out from a data processing section 1, the map data are displayed on a display section 6. The map data to be read are determined, a command is fed to the communication controller 9 from an operation section 7 to gain access to the data base via the modem section 8, and the required map data are received and stored in a memory section 4. The data processing section 1 receives the map data from the memory section 4 and the vehicle position calculated from the position measurement data of GPS satellites from a signal processing section 2 and plots and displays 6 the present position on a map. The newest map data can be received even if no map data are stored in a CD-ROM.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is capable of connecting to a public telephone network via a cellular telephone and is capable of data communication via the public telephone network.
tem) Receiving device.

[0002]

2. Description of the Related Art In recent years, positioning by a GPS receiving device has come to be used for positioning on land such as car navigation. A conventional GPS will be described below with reference to the drawings.
The configuration of the receiving device will be described.

FIG. 4 is a block diagram showing the structure of a conventional GPS receiver. In FIG. 4, reference numeral 1 is data for performing overall control, receiving data from the signal processing unit 2 and the memory unit 4 to be described later, performing positioning calculation of the current position in accordance with an instruction from the operation unit 6, and outputting data for display. Processing unit, 2
Is a signal processing unit that modulates the received radio waves from GPS satellites, processes the data, and outputs navigation messages, pseudoranges, code control information, etc. as electrical signals, and 3 is an antenna unit that receives the radio waves from the GPS satellites. 4, a memory unit for temporarily storing map data, 5 an external storage device unit for reading map data from a storage medium such as a CD-ROM or IC card, 6 a display unit for displaying the current position on the map, 7
Is an operation unit composed of a switch having a positioning start command and other functions.

The operation of the conventional GPS receiver configured as described above will be described. First, a positioning start command is input from the operation unit 7 of the GPS receiving device. The data processing unit 1 commands the signal processing unit 2 to start reception. The signal processing unit 2 uses GPS
The antenna unit 3 receives radio waves from the satellite to measure the current position, and passes the result to the data processing unit 1. Based on the positioning result, the data processing unit 1 reads a map of applicable coordinates from the external storage device unit 5 into the memory unit 4, reads the map data of the display range from the memory unit 4, and creates image information to be displayed on the display unit 6. Then, the map is displayed on the display unit 6, and the current position is displayed.
Display it on the map.

[0005]

However, in the configuration of the conventional GPS receiving apparatus described above, even if the map data of a place which is only visited once, it is necessary to bring the map data to display the current position. Therefore, a huge amount of map data can be stored in the external storage device CD-RO.
It must be held as a storage medium such as M or an IC card.

Further, if it is desired to obtain detailed map data, the size of the map data becomes infinitely large, and it is necessary to frequently replace the storage medium of the external storage device section. For detailed maps, especially to accommodate new road conditions,
It is necessary to replace the storage medium with the latest one.

A first object of the present invention is to solve the above problems, to make it possible for a user to easily obtain the latest detailed map data, and to eliminate the need to carry many storage media.

[0008] In addition, the GPS that is generally open to the public
The positioning data from the satellite is called C / A code. The GPS receiving device locks a code different for each satellite and then calculates the distance from each satellite to the antenna using the propagation time of the radio wave to perform positioning. The accuracy of this method is usually "L1," which is used by general users.
C / A code SPS (Standard Positioning Service)
s) ”, that is, a GPS receiver that is 100% affected by SA (Selective Availability: The US Department of Defense intentionally degrades the positioning accuracy of the C / A code receiver for reasons of national security and military strategy). When used, it is said to be 15-100 mRMS. Accuracy is 100mR
In MS, for example, even if detailed map data of 1/5000 is obtained, it will be displayed as a positioning result somewhere within a circle with a radius of 5 cm, which is insufficient to know the current position. It is precision.

The present invention solves the above problems, obtains correction data by the differential GPS position method by the data communication function, and corrects the positioning result by using the correction data, so that 1 to 5 mRMS in a stationary state The second purpose is to improve the positioning accuracy by 5 to 10 mRMS and to know a more accurate current position.

[0010]

In order to achieve the above object, the present invention provides a modem unit connectable to a cellular telephone, a communication control unit for controlling data transmission / reception using the modem unit, and various data. A memory unit that can be temporarily stored,
An external storage device unit that can read a storage medium such as a CD-ROM or an IC card, an antenna unit that receives broadcast data from GPS satellites, and a broadcast data received from the GPS satellites are processed and necessary for positioning. A signal processing unit that takes out data and outputs it as an electric signal, a data processing unit that performs overall control and processes data such as data from the signal processing unit, map data, and differential correction data to perform positioning calculation, and a positioning result. It is characterized by having a display unit for displaying the current position and an operation unit for inputting a command such as a positioning start command.

[0011]

According to the present invention, the positioning result can be corrected by the modem unit connectable to the public telephone network via the cellular phone or the like in the GPS receiver, the control unit for data communication, and the correction data. By providing the data processing unit,
Detailed map data can be fetched from a data bank connected via a public communication network, and correction data can also be fetched to display the current position more accurately.

[0012]

1 is a block diagram showing the configuration of a GPS receiving apparatus according to an embodiment of the present invention. In FIG. 1, 8
Is a modem unit that modulates and demodulates signals necessary for data communication by connecting to a public communication network, and 9 is a communication control unit that controls data communication, and other blocks having the same functions as those in FIG. The description is omitted.

Here, the data processing unit 1 of FIG. 1 differs from the data processing unit 1 of FIG. 4 in that it is configured by the block diagram illustrated in FIG. In FIG. 2, 11 is a positioning unit that performs normal positioning calculation, 12 is a correction unit that corrects the positioning result with correction data, and 13 is an I / F for inputting / outputting data.
Part 14 reads necessary map data from the positioning result,
A display control unit 15 generates display data for displaying the current position, and a control unit 15 receives an input from the operation unit 7 and controls the whole.

FIG. 3 is a diagram showing the entire system according to the present invention. 31 is a reference station that has a GPS receiver installed at an accurately measured fixed point, performs positioning calculation, and can output positioning error as vector data, 32 is a database, 33 is a base station of a cellular phone,
Reference numeral 34 is a cellular telephone, 35 is a GPS receiver having the configuration of the present invention, and 36 is a GPS satellite.

The operation of the GPS receiver configured as above will be described with reference to FIGS.

Database 32 that can supply map data
Has the following functions. Cellular telephone base station
It is connected to 33, has detailed map information in the service area of the base station 33 as data, and has a function capable of data communication with the GPS receiving device 35 having the configuration of the present invention.

Connect the modem unit 8 to the cellular telephone 34,
The data processing unit 1 which receives the command input from the operation unit 7 transmits the command to the communication control unit 9, and the communication control unit 9 connects to the database 32 via the public communication network through the modem unit 8. Hereinafter, data communication between the database 32 and the GPS receiving device 35 having the configuration of the present invention is executed according to a command from the data processing unit 1 under the control of the communication control unit 9 through the modem unit 8.

The data processing unit 1 calls a menu of map data in the database 32 and displays it on the display unit 6. The user decides which map data to read and inputs a command from the operation unit 7. According to the command, the communication control unit 9 accesses the database 32 through the modem unit 8 to fetch the necessary map data and store it in the memory unit 4. The data processing unit 1 receives map data from the memory unit 4 and positioning data of the GPS satellites 36 from the signal processing unit 2 to perform positioning calculation, and displays the current position on the map on the display unit 6 based on the positioning result.

Next, the operation of the data processing unit 1 shown in FIGS. 1 and 2 in the above operation will be described.

A reference station 31 having the following functions is connected to the database 32 capable of supplying the correction data shown in FIG. This reference station 31 is installed at an accurately measured fixed point. In addition, the reference station 31 tracks all GPS satellites in the field of view, performs positioning calculation for each combination of several receivable satellites, and uses the error from the accurate position data of the reference station 31 as vector data. Send to database 32.

This correction data is repeatedly updated every 10 to 20 seconds. The service range of one reference station is a radius of about 50km.

Connect the modem unit 8 to the cellular telephone 34,
The control unit 15, which receives the command input from the operation unit 7 through the I / F unit 13, transmits the command to the communication control unit 9 through the I / F unit 13, and the communication control unit 9 passes through the modem unit 8 and Connect to the database 32 via a communication network. Hereinafter, data communication between the database 32 and the GPS receiving device 35 is executed according to a command from the control unit 15 under the control of the communication control unit 9 through the modem unit 8. Further, all input / output of the data processing unit 1 is performed via the I / F unit 13.

The data processing unit 1 receives the positioning data from the signal processing unit 2 at the positioning unit 11. The positioning unit 11 passes the combination of the positioning result calculated from the positioning data and the GPS satellite 36 used for positioning to the correction unit 12. Then, the correction unit 12
Instructs the control unit 15 to read the correction data for the combination of the GPS satellites 36 used for positioning. The control unit 15 accesses the database 32 and uses the GPS satellites 36 used for positioning.
The correction data for the combination is read, a command is issued to store it in the memory unit 4, and this is controlled.

When the reading of the correction data is completed, the control unit 15 notifies the correction unit 12 of the correction start instruction and the address of the correction data on the memory. Upon receiving this command, the correction unit 12 reads the correction data from the memory unit 4, corrects the positioning data using the correction data, calculates a more accurate positioning result, and displays the calculated positioning result on the display control unit 14
Send to. The display control unit 14 creates image data for displaying an accurate current position on the map based on the received positioning result and the map data stored in the memory unit 4, and displays the image data on the display unit 6.

Next, a method of accessing the database 32 by the GPS receiver 35 of FIG. 3 will be described.

The map data and differential correction data service system has a central database having the functions described below. By receiving the location data, it is possible to supply a telephone number for accessing a database serving the location.

It is input from the operation unit 7 whether map data or differential correction data is read.
According to this instruction, the data processing unit 1 first performs positioning and measures its own current position. Next, the communication control unit 9 is instructed to access the central database. When the communication control unit 9 automatically accesses the central database, it receives the data of the current position from the data processing unit 1, transmits it to the central database, and makes the point the service area.
It receives 32 telephone numbers and stores them in the memory unit 4. The communication control unit 9 accesses the telephone number and connects to the database 32.

After the connection, once the differential correction data is read, the telephone number is read from the memory unit 4 every time positioning is performed, the database 32 is accessed, this position is transmitted, and it is confirmed whether or not the user is still in the service area. Receive correction data. If the user goes out of the service area, the database 32 judges from the received position data and transmits the telephone number to the database having that area as the service area. The communication control unit 9 having received the telephone number updates the telephone number in the memory unit 4, accesses the database 32 having the current position as the service area, and receives the data service.

[0029]

As described above, the GPS receiving apparatus of the present invention accesses the latest map data to the database by the data communication function, which is a feature of the present invention, without having the map data as an external storage medium. It was made possible by receiving the correction data at the same time, and the positioning result was corrected to enable highly accurate positioning.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a GPS receiver according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a data processing unit in FIG.

FIG. 3 is a diagram showing an entire system according to the present invention.

FIG. 4 is a block diagram showing a configuration of a conventional GPS receiver.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Data processing part, 2 ... Signal processing part, 3 ... Antenna part, 4 ... Memory part, 5 ... External storage device part, 6 ... Display part, 7 ... Operation part, 8 ... Modem part, 9 ... Communication control part, 11 ... Positioning unit, 12 ... Correction unit, 13 ... I / F unit,
14 ... Display control unit, 15 ... Control unit, 31 ... Reference station, 32 ... Database, 33 ... Cellular telephone base station, 34 ... Cellular telephone, 35 ... GPS receiver having configuration of the present invention, 36 ... GPS satellite.

Claims (2)

[Claims] 1. A modem unit connectable to a cellular telephone, a communication control unit for controlling transmission / reception of data using the modem unit, a memory unit capable of temporarily storing various data, a CD-ROM, An external storage device unit that can read a storage medium such as an IC card, an antenna unit that receives broadcast data from GPS satellites, a process that processes the received broadcast data from GPS satellites, and the data necessary for positioning is taken out to generate electricity. A signal processing unit that outputs as a signal, a data processing unit that performs overall control and processes data such as data from the signal processing unit, map data, and differential correction data to perform positioning calculation, and displays the current position as a positioning result. A GPS receiving device, comprising: a display unit for displaying a position and an operation unit for inputting a command such as a positioning start command. 2. The data processing unit is required from a positioning unit that performs normal positioning calculation, a correction unit that corrects the positioning result with correction data, an I / F unit for inputting / outputting data, and a positioning result. The GPS according to claim 1, further comprising: a display control unit that reads various map data and the like to generate display data for displaying a current position, and a control unit that receives an input from the operation unit and controls the whole. Receiver.