JPS62298785A - Gps position measuring apparatus - Google Patents

Abstract

PURPOSE:To enable quicker measurement of a position, by update the current position requiring registration as initial value each time a moving station detects the passage of a boundary according to a received electric field from a base station located at each area to determine the newest position using multiple satellite data. CONSTITUTION:Base stations T1 and T2 are arranged at respective areas A1 and A2 and connected to a central base station TC with wires L1 and L2. A moving object No detects electric fields from the areas A1 and A2 with a receiv er carried, the number of a vehicle and a position data thereof are registered at each detection of the electric field with a wireless apparatus into a memory M of the central base station TC through base stations T1 or T2 and each time the vehicle passes a boundary, they are updated as initial value of the moving body. The central base station TC starts up a satellite navigator to determine the position of the moving body using the newest data of several satellites and a initial position data constantly updated and the results are displayed. Thus, the initial position is automatically set by a wireless telephone to eliminate the need for manual inputting thereby enabling quicker measure ment of a position.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention [Field of Industrial Application] This invention is based on GPS (G 1 obal po
The present invention relates to a position measuring device using a positioning system.

[Prior Art] A GPS position measuring device measures the distance between an aircraft, ship, vehicle, or other object to be positioned and each satellite by receiving radio waves from the Man II star for multiple satellites necessary for positioning. The position is calculated by convergence calculation, and its principle and method are described in Japanese Patent Application Laid-Open No. 1557-1983.
3. IEICE Technical Research Report Vol. 1.84. No,
78.8 ANE84-12, Automotive Technology 1985. V
OL, 39-1 (Satellite Navigation Global Positioning System), etc.

However, with conventional GPS position measuring devices,
You can manually set the initial position for performing the convergence calculation using the keyboard, or you can memorize the position of the object to be measured when the power is turned off and use this position when the power is turned on next time. Because of this configuration, the former method requires time to set the initial position and there is a risk of setting the wrong position, while the latter method requires that the object to be positioned be moved to another location when the power is turned off. In such a case, there is a problem in that the stored position cannot be used as the initial position when the power is turned on.

[Object of the Invention] The present invention aims to improve the above-mentioned problems and provide a GPS position measuring device that can automatically set an accurate initial position even when the object to be positioned is moved when the power is turned off. purpose.

[Summary of the Invention] In order to achieve the above object, the present invention includes a GPS position measuring device equipped with an antenna capable of wireless communication with each base installed in each region and connected to a central base, and a GPS position measuring device equipped with an antenna capable of wireless communication with each base connected to a central base, and boundary recognition means for detecting the incoming radio field intensity or demodulated S/N and recognizing the boundary of the area; a registration request signal output means for outputting a registration request signal indicating that registration is to be performed, and a registration request signal output means that reads the current region stored in the central base when the satellite navigation device is activated, and sets a predetermined position within the region to the initial position of the object to be measured. An initial position setting means for setting a position, and an initial position set by the means and a satellite position of multiple satellites. and a position calculation means for calculating the current position of the object to be initially positioned by convergence calculation based on the data, so that the initial position for each region can be automatically set.

[Example] Hereinafter, the present invention will be described in detail using the accompanying drawings.

FIG. 1 is a block diagram showing the configuration of a GPS position measuring device for a vehicle according to an embodiment of the present invention, and FIG.
Explanatory diagram of the memory possessed by the S position measuring device, FIG. 2(b)
3 is an explanatory diagram of the memory possessed by the central base station, FIG. 3 is an explanatory diagram showing the communication method of the mobile communication device, and FIG. 4 is a flowchart of positioning processing.

As shown in FIG. 1, the GPS position measuring device generally includes a satellite navigation device 10 that captures GPS radio waves and calculates the vehicle position, and a mobile communication device (8) that provides the device with the initial position of the vehicle. The satellite navigation system 20 includes a display device 30 that displays the positioning results of the satellite navigation device 10.

The satellite navigation device 10 includes a GPS antenna 11, a pseudorange measurement circuit 12, a satellite data reproduction/holding circuit 13, a satellite placement i1 section 14, a satellite selection section 15, and a position calculation section 1.
6, a display control circuit 17, and a memory 18.

The GPS antenna 11 is for capturing satellite radio waves.

The pseudo distance measuring circuit 12 calculates the distance between the antenna 11 and the captured satellite by multiplying the propagation delay time of captured radio waves by the speed of light.

The satellite data reproduction/holding circuit 13 stores and holds the latest satellite data regarding a plurality of captured satellites, and provides the contents to the satellite placement calculation section 14 and the position calculation section 16.

The satellite selection unit 15 inputs satellite orbit data from the satellite data reproducing and holding circuit 13 and learns the actual status of the satellite arrangement at the current time.

The satellite selection unit 15 calculates DOP([) 1lu at the current position based on the satellite configuration recognized by the satellite configuration calculation unit 14.
tion of precision) is calculated, and a capture command is output to the satellite capture means including the pupil similarity measurement circuit 12 to capture the satellites of the calculated combination.

The position calculation unit 16 inputs the satellite data necessary for position calculation from the Wi star data reproduction and holding circuit 13, and also inputs the initial position from the initial position setting unit 19 via the circuit 13 at the time of system startup, and combines these data with the above-mentioned data. The pseudorange inputted from the pseudorange measuring circuit 12 is used to perform a predetermined convergence calculation to calculate the position of the antenna 11, that is, the current position of the vehicle.

The display control circuit 17 performs predetermined display control to cause the display 30 to perform a predetermined display regarding the calculated position.

As shown in FIG. 2(a), the memory 18 stores area identification numbers (A, B, . . . ) for a large number of areas and the corresponding center positions (θA, φA, θB, φB) of each area.・・・
・). In this example, the region means the region where the base station of the wireless telephone is located.

The initial position setting unit 19 sets the mobile communication 12 at the time of system startup.
0, inputs the current area from the mobile communication device 20, reads the area center position corresponding to the area from the memory 18, sets this position as the initial position of the vehicle, and provides it to the position calculation unit 16. It is something to do.

The mobile communication device 20 includes a mobile communication antenna 21, a duplexer 22, a transmitter 23, a receiver 24, a synthesizer 25, a controller 26, and a telephone 27.

The mobile communication antenna 21 is for telephone radio.

The duplexer 22 is a signal input/output section shared by the transmitting section 23, the receiving section 24, and the synthesizer section 25.

The transmitting section 23 is for inputting a signal from the telephone 27 and a signal output by the control section 26 for initial position setting, and outputting a predetermined transmission signal to the duplexer 22.

The receiving unit 24 performs processing when there is a telephone call, and processes signals input from the antenna 21 for initial position setting.

The synthesizer section 25 is for generating an audio signal for the telephone 27.

In addition to controlling the telephone 27, the control unit 26 performs processing to detect the strength or demodulated S/N of radio waves constantly output from each base station (see Fig. 3) for initial position setting, and performs processing for detecting the demodulated S/N of radio waves constantly output from each base station (see Fig. 3). The process includes outputting a predetermined registration request signal R8 in the intrusion area when the satellite enters the area, and receiving registration information from the central base station when the satellite navigation device 10 is started up.

Details of these processes will be explained in detail in FIGS. 3 and 4.

Telephone t127 is an ordinary telephone installed in the vehicle.

The communication system of the mobile communication amplifier 21 is shown in FIG.

First, a central base station TO is provided on the ground, and the central base station TC is connected to base stations T1, . T2・
... and are connected by telephone lines L+, L2...

Each base station T+, T2, . . . is for wireless communication with the telephone 27. Moreover, the central base station Tc is nothing but a computer system connected to these base stations T+, T2, . . . .

As shown in FIG. 2(b), when the central base station Tc receives the registration request signal R8 from the mobile communication f120 via each base station T+, T2, . . . Base station T+ used to communicate the number No. and the signal concerned
, T2 . . . in association with the area identification numbers Δi. Same mobile communication device (No.)
If you have been contacted multiple times in succession, please use the area identification number A.
i is updated with the later one.

On the other hand, the mobile communication device 20 mounted on the vehicle is connected to the base station T+
, T2... By constantly monitoring the radio field strength or m-scale S/N, the boundaries between each area A+, A2... are detected by changes in signal level, etc., and at this point, the intrusion area A is detected.
The registration request signal R8 is output from t via the base station Ti.

The mobile communication device 20 is connected to each region A+, A2...Ai...
・A registration request signal R8 is output every time the terminal passes through the central base station TO, and the area identification number A1 related to the final registration request signal R8 is stored in the memory M of the central base station TO in correspondence with the number (No.) of the mobile communication device.
will be registered.

The mobile communication device 20 obtains its own number (N
Corresponding to O), it is possible to transmit the contents A1 of the memory M of the medium-fired base station TC.

Therefore, the mobile communication 120 can be used when the vehicle is traveling through various regions on the map and stopped in the pear region Ai, or when the vehicle is stopped in a certain region and the GPS position measuring device is powered off. In the case where the mobile communication device 20 is moved to another area A1, it is possible to read out the area Ai of its own weight from the central base station TO, provided that the power of the mobile communication device 20 is always turned on.

The positioning process of the GPS position measuring device having the above configuration will be explained using FIG. 4. In step 401, after the GPS position measuring device is powered on, initial values (excluding the initial position) necessary for subsequent calculations are set.

In step 402, the area identification number Ai is read from the mobile communication 1120.

In step 403, the area identification number Ai read in step 402 is retrieved from memory 18.

In step 404, after the search is completed, the position data (1-1) corresponding to the area identification number Ai (Yomaro, Keika) is read from the memory 18.

In step 405, the read position data is set as the initial position of the vehicle.

In step 406, the current time is set.

The time is set using battery-backed RTC (real time clock).
This is done automatically using a time clock).

In step 407, satellite data is captured for the selected satellite.

In step 408, pseudorange measurements are made.

In step 409, satellite data is collected.

In steps 410 and 411, positioning calculations are performed for the captured satellites. If the number of satellites is insufficient, positioning calculations will not be performed.

In step 412, the satellite configuration is calculated for the next position calculation.

In step 412, a DOP value is calculated.

In step 414, the satellite with the minimum DOP value is selected.

As described above, in this example, since the center position of the area Ai where the vehicle is located is automatically set as initial position data in step 405, subsequent convergence calculations are performed smoothly.

By the way, generally speaking, the service area radius of a car phone is about 5 km in urban areas and about 10 km in suburban areas.

On the other hand, it is known that the initial position of a GPS position measuring device can be used if the distance is within approximately 1100 km from the true position.

Therefore, in the application method of the car phone according to the present invention, the vehicle position can be detected with an error within 10 to 20 km, so an excellent value can be set as the initial value.
It is possible to perform the convergence operation in step 411 more quickly.

[Effects of the Invention] As described above, according to the present invention, an accurate initial position can be automatically set using a wireless telephone station, so the initial position of the object to be measured can be manually input when the radio navigation device is powered on. It is possible to provide a GPS position measuring device that enables quick convergence calculation without the need for the above.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of a vehicle GPS position measuring device according to an embodiment of the present invention, and FIG.
An explanatory diagram of the memory possessed by the position measuring device, FIG. 2(b) is an explanatory diagram of the memory possessed by the central base station, FIG. 3 is an explanatory diagram showing the communication method of the mobile communication device, and FIG. 4 is a flowchart of the positioning process. It is. 10...t! Li star navigation device 11...GPS antenna 12...Pseudo distance measurement circuit 13...Satellite data reproduction and holding circuit 14...Satellite placement calculation section 15...Satellite selection section 16
...Position calculation section 17...Display control circuit 18.
...Memory 19...Intended position setting section 20.
... Mobile communication device 21 ... Mobile communication antenna 22 ... Duplex device 23 ... Transmission section 24 ...
・Receiving section 25...Synthesizer section 26...
・Control unit 27...Telephone 30...Display device Agent Patent attorney Yasuo Miyoshi Figure 4

Claims (2)

[Claims] (1) Recognize the boundaries of the region by detecting antennas that can communicate wirelessly with each base installed in each region and connected to the central base, and the radio wave strength or demodulated S/N sent from each base. a boundary recognition means; a registration request signal output means for outputting a registration request signal to the effect that the current area of the object to be measured should be registered to the central base via a base in the intrusion area based on the boundary recognition of the means; and a satellite. initial position setting means for reading the current area stored in the central base when the navigation device is activated and setting a predetermined position within the area as the initial position of the object to be measured, and the initial position set by the means; A GPS position measuring device comprising: position calculation means for determining the current position of a positioning object by convergence calculation based on satellite data of a plurality of satellites. (2) The GPS position measuring device according to claim 1, wherein the base is a radio wave transmission/reception base for a wireless telephone.