JP2000241526A - Gps positioning system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a GPS positioning system by which the position of a GPS receiving terminal can be controlled in a wide range more than in conventional cases. SOLUTION: A GPS positioning apparatus 10 calculates positions of radio base stations 301,... on the basis of ID information on the radio base stations obtained from GPS receiving terminals 1. Distances up to respective GPS satellites can be calculated precisely from the radio base stations 301,... pseudo distances up to the GPS satellites can be calculated from the GPS receiving terminals 1. Then, not on the basis of the position of the GPS positioning apparatus 10 but on the basis of the positions of the radio base stations 301,... in which the GPS receiving terminals 1 belong to a communication area, the pseudo distances up to the respective GPS satellites from the GPS receiving terminals 1 are calculated. As a result, a distance is not limited as different from conventional cases between the GPS positioning apparatus 10 and the GPS receiving terminals 1. As a result, the positions of the GPS receiving terminals 1 can be controlled in a wide range more than in conventional cases.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a GPS (Global
The present invention relates to a GPS positioning system that receives a signal from a satellite and measures the position of a receiving point.

[0002]

2. Description of the Related Art Conventionally, a GPS receiver that receives a signal (GPS signal) from a GPS satellite and measures its own position includes:
An antenna for receiving a normal GPS signal, a high-frequency converter for down-converting a received signal and converting it to an IF (intermediate frequency) band signal, a CDMA (Code Division Multi)
iple Access: Code division multiple access) A correlator for demodulating a modulated GPS signal to obtain a navigation message and measuring a phase difference of a pseudo-random code, a control function of the correlator, a navigation message demodulation function, A satellite orbit calculation function for calculating a satellite orbit of a GPS satellite based on a navigation message, and a GPS based on data obtained as a result of correlation.
Pseudo distance calculation function to calculate pseudo distance to satellite, positioning calculation function to perform positioning calculation of reception position based on pseudo distance and satellite orbit, GP to search when starting GPS receiver
A visible satellite selection function for determining the S satellite is required. Since these functions require high-speed arithmetic functions,
Usually, a GPS (Digital Signal Proce
ssor) and a high-performance CPU are used.
A ROM and a RAM of several hundred kilobytes are mounted.

Meanwhile, a location management system comprising a GPS receiving terminal mounted on a mobile object such as a person or an automobile, and a location management center for centrally managing the position of the mobile object measured by each GPS receiving terminal. Has conventionally been provided. The GPS receiving terminal of such a location management system is required to be small in size and low in power consumption to be mounted on a mobile object.

In order to reduce the size and power consumption of the GPS receiving terminal and reduce the system cost, a distributed processing type GPS positioning system has been devised. In the GPS receiving terminal in the distributed processing type GPS positioning system, among the above-described configuration and functions of the GPS receiver, a high-frequency conversion unit that down-converts a GPS signal received via an antenna and converts it into an IF band signal, CDMA modulation GP
It has only a correlator for measuring the code phase of the pseudo-random code from the S signal, a control function of the correlator, and a communication interface function, and a positioning calculation function and a satellite orbit calculation function that require other high-speed calculations. , And a pseudo-range calculation and a demodulation function of a navigation message are performed by a GPS positioning device (server) installed in a location management center.

[0005]

As described above, the GPS
Employs a spread-spectrum communication system (CDMA system) using a pseudo-random code unique to each GPS satellite, and a pseudo-random code included in a GPS signal transmitted from the GPS satellite and a GPS receiving terminal internally. The code phase difference in the same pseudo random code is detected by taking the correlation of the generated pseudo random code, and a higher correlation peak is obtained as the code phase difference is smaller. Here, SPs using the C / A code of the L1 band (1575.42 MHz) are open to the private sector.
S (Standard Positioning Service) only. In the case of this SPS, the pseudo-random code length is 1 msec, so that it is approximately 300 km in terms of distance. GP
Since the orbit altitude of the S satellite is about 20,000 km, the pseudo-random code is included in the pseudo-random code a plurality of times. Only shows.

In order to transmit the code phase difference of the pseudo random code detected by the correlator from the GPS receiving terminal to the GPS positioning device, and to calculate the pseudo distance by the GPS positioning device, GP
It is necessary to measure and compensate for a portion of 300 km or more on the S positioning device side. In this case, it is necessary to limit the distance between the GPS receiving terminal and the GPS positioning device to be within a half of the code length of the pseudo-random code, that is, within 150 km. There was a problem that it was not possible.

Further, in a distributed processing type GPS positioning system, it is necessary to communicate with the GPS positioning device every time a GPS signal is received on the GPS receiving terminal side. There was a problem that it became very high.

[0008] The present invention has been made in view of the above problems, and an object of the present invention is to provide a GPS positioning system capable of managing the position of a GPS receiving terminal in a wider range than before. It is in.

Another object of the present invention is to provide a GPS positioning system capable of reducing operation costs in addition to the object of the present invention.

[0010]

According to one aspect of the present invention, there is provided one or more wireless base stations installed at a known location and transmitting a wireless signal including its own ID information. Frequency conversion means for receiving a GPS signal spread-spectrum-modulated by a pseudo-random code and converting it into a digital intermediate-frequency band signal; correlating the intermediate-frequency digital signal with the pseudo-random code to obtain a correlation between the two; Correlation detecting means for detecting information, wireless communication means for receiving ID information from a wireless base station in a communication area to which it belongs, and transmitting the received ID information and the correlation information detected by the correlation detecting means in a wireless signal, correlation detection And a plurality of GPS receiving terminals including control means for controlling the wireless communication means, and ID information of a wireless base station transmitted from the GPS receiving terminals Wireless communication means for receiving the fine correlation information, the GPS receiving terminal based with this pseudo-range and the correlation information for calculating a pseudorange of the GPS satellites captured by the radio base station and the GPS receiving terminal based on the ID information G
G pseudo distance calculation unit for calculating the pseudo distance to the PS satellite, G
And a GPS positioning device including positioning calculation means for calculating the position of the GPS receiving terminal based on each pseudo distance from the PS receiving terminal to a plurality of GPS satellites by calculation. Instead of using the position of the device, the GPS receiving terminal measures the position of the GPS receiving terminal with the GPS positioning device using the position of the wireless base station belonging to the communication area, so that the GPS receiving terminal and the GPS positioning device The restriction on the distance between the two can be eliminated. As a result, the position of the GPS receiving terminal can be managed in a wider range than before.

According to a second aspect of the present invention, in the first aspect of the present invention, the holding means for holding the correlation information obtained from the GPS signals received at predetermined reception intervals and the ID information of the radio base station is provided in the GPS receiving terminal. The control means controls the correlation information and the ID information held in the holding means to be transmitted from the wireless communication means to the GPS positioning device at least at every transmission interval of a predetermined time longer than the reception interval. In addition to the effect of the invention of Item 1, the cost required for communication between the GPS receiving terminal and the GPS positioning device can be reduced, and even when the GPS receiving terminal moves over a long distance, the GPS positioning device uses the GPS. The location of the receiving terminal can be managed.

According to a third aspect of the present invention, in the second aspect of the present invention, the GPS positioning device receives a GPS signal and receives each GPS signal.
GPS signal processing means for acquiring a navigation message of a satellite, storage means for storing data of GPS satellites in the visible area of each GPS receiving terminal based on the navigation message and ID information of the radio base station, and storage means for the storage means Control means for transmitting the data being transmitted from the wireless communication means to the GPS receiving terminal at predetermined time intervals,
In addition to the effect of the invention of claim 2, the GPS receiving terminal
The time required to capture the PS satellite can be reduced,
The power consumption of the GPS receiving terminal can be reduced.

[0013] The invention of claim 4 is the invention of claim 1 or 2 or 3.
In the invention of the present invention, a GPS signal is installed at a known position, a navigation message of each GPS satellite is acquired, and a GP is set based on the navigation message and its own position information.
One or more DGPSs for creating pseudo-range correction information relating to a pseudo-range between the S satellite and the GPS receiving terminal, and transmitting the pseudo-range correction information to the GPS positioning device by radio signals
The GPS positioning device includes a reference station, and the positioning calculation means includes a DG
G based on the pseudo distance correction information obtained from the PS reference station
The position of the GPS receiving terminal is measured by calculation by correcting the pseudo distance from the PS receiving terminal to each GPS satellite, and the position of the GPS receiving terminal is calculated.
The positioning accuracy of the GPS receiving terminal can be improved.

[0014] The invention of claim 5 is the invention of claim 1 or 2 or 3.
In the invention of the above, an FM multiplex broadcast receiver for receiving the pseudo distance correction information transmitted by the FM multiplex broadcast and relaying the pseudo distance correction information to the GPS positioning device is provided, and the positioning calculation means of the GPS positioning device includes the FM multiplex broadcast Based on the pseudo distance correction information obtained from the receiver, each GPS
3. The method according to claim 1, wherein a pseudo distance to the S satellite is corrected, and a position of the GPS receiving terminal is calculated by calculation.
Or, in addition to the function of the invention of the third aspect, the GPS is provided at a relatively low cost.
The positioning accuracy of the receiving terminal can be improved.

[0015]

(Embodiment 1) FIG. 1 shows a system configuration of Embodiment 1 of the present invention. The GPS positioning system according to the present embodiment includes a plurality of GPS receiving terminals 1, a GPS positioning device 10, and a wireless communication network (wireless communication network) W.
It is composed of a plurality of radio base stations 30 ₁ ... belonging to the LN.

The GPS receiving terminal 1 has a GP that has been subjected to spread spectrum modulation (CDMA modulation) using a pseudo random code.
A GPS antenna 2 for receiving an S signal, a frequency conversion unit 3 for converting a GPS signal received by the GPS antenna 2 into a digital intermediate frequency band (IF) signal, and a pseudo random generated internally with the digital IF signal A correlation detection unit 4 for detecting correlation information such as a code phase difference between the two by taking a correlation with a code, and receiving ID information from the wireless base station 30 ₁ ...
A wireless communication unit 5 for transmitting information and correlation information detected by the correlation detection unit 4 as wireless signals, a wireless antenna 6 for transmitting and receiving wireless signals, and a control unit for controlling the correlation detection unit 4 and the wireless communication unit 5 7 is provided. Here, the control unit 7 is configured by a microcomputer, and its function is realized by firmware.

The GPS positioning device 10 includes a GPS antenna 11 for receiving a GPS signal, a frequency converter 12 for converting a GPS signal received by the GPS antenna 11 into a digital IF signal, and a digital IF signal internally generated. GPS for obtaining correlation information such as a code phase difference between them and a navigation message by correlating with the pseudo-random code
A signal processing unit 13, a communication interface unit 14 for transmitting and receiving wireless signals via a wireless antenna 15, and a database unit 16 in which the absolute positions of the wireless base stations 30 ₁ ... are registered.
A pseudo-range calculating unit 17 for calculating a pseudo-range from the GPS receiving terminal 1 to each GPS satellite, a positioning calculating unit 18 for calculating the position of the GPS receiving terminal 1 for positioning, and each of the positioned GPS receiving terminals 1 A display section 19 for displaying the position of
A satellite orbit calculation unit 20 for obtaining a GPS satellite in the visible region of each GPS receiving terminal 1 from almanac information included in the navigation message acquired by the PS signal processing unit 13; Note that the GPS positioning device 10 is configured by a general-purpose computer device, and the pseudo distance calculation unit 17, the positioning calculation unit 18, and the satellite orbit calculation unit 20 are realized by software, and the display unit 19 is configured by a display device. .

The wireless base stations 30 _1, ... Have a conventionally known configuration such as a PHS network, and relay wireless communication performed between each GPS receiving terminal 1 and the GPS positioning device 10.

Next, the operation of this embodiment will be described with reference to the operation sequence diagram of FIG.

The GPS positioning apparatus 10 is always in an operating state, and receives and demodulates GPS signals by the GPS antenna 11, the frequency converter 12, and the correlation detector 13 to collect ephemeris information and almanac information of each GPS satellite.
It is stored in a memory (not shown).

When the power is turned on, the GPS receiving terminal 1 acquires the ID information of the wireless base stations 30 ₁ ... After that, GPS
A call is issued to the positioning device 10 and the obtained ID information is notified via the wireless communication network WLN. In the GPS positioning device 10, G
Based on the ID information received from the PS receiving terminal 1 indexing positions of the radio base station 30 ₁ belongs from the database unit 16 of the GPS receiving terminal 1, the GPS satellites in the visible region of the communication area by using the almanac information It is calculated by the satellite orbit calculation unit 20, and the communication interface unit 14 notifies the GPS receiving terminal 1 from the wireless antenna 15 as search satellite information. The GPS receiving terminal 1 searches for a GPS satellite based on the search satellite information received via the wireless communication network WLN. If the GPS satellite can be captured, the data of the code phase difference of the pseudo-random code detected by the correlation detection unit 13 is transmitted to the GPS positioning device 10 via the wireless communication network WLN.

GPS receiving the code phase difference data
In the positioning device 10, the pseudo distance calculation unit 17 uses the G
The pseudo distance from the PS receiving terminal 1 to each GPS satellite is calculated. Here, a specific method of calculating the pseudo distance from the GPS receiving terminal 1 to each GPS satellite will be described.
First, the position of the GPS satellite calculated by the satellite orbit calculation unit 20 and the distance to each GPS satellite at the point where the wireless base station 30 ₁ ... To which the GPS receiving terminal 1 belongs are calculated. That is, the position of each GPS satellite and the radio base station 3
Since the positions of 0 ₁ ... Can be known exactly, the radio base stations 30 ₁ .
, The distance to each GPS satellite can be accurately calculated. Therefore, since the number of pseudo random codes included in the distance can be extracted, the pseudo random codes (about 1 msec
A distance that is an integral multiple of c) is determined. By adding the code phase difference (1 msec or less) of the pseudo random code of each GPS satellite received from the GPS receiving terminal 1 to this, G
The pseudo distance from the PS receiving terminal 1 to the GPS satellite can be calculated. Then, the GPS receiving terminal 1 thus obtained
Using the pseudo distance from the GPS satellites to the respective GPS satellites, an accurate position of the GPS receiving terminal 1 is calculated by the positioning calculation unit 18 of the GPS positioning device 10 and the position is displayed on the display unit 19.

Here, 1 msec is a pseudo distance of about 3
, A distance of 150 km from at least one of the radio base stations 30 ₁ .
, The pseudo distance to the GPS satellite can be calculated by the GPS positioning device 10 as described above. In fact, since communicable distance between the GPS receiving terminal 1 and the radio base station 30 ₁ ... by the wireless communication is several hundreds to several tens of km, always as described above the position of each GPS receiving terminal 1 Can be measured by the GPS positioning device 10.

As described above, in the GPS positioning system of the present embodiment, not the position of the GPS positioning device 10 but the GPS
Since the receiving terminal 1 calculates the pseudo distance from the GPS receiving terminal 1 to each GPS satellite based on the positions of the wireless base stations 30 ₁ ... Belonging to the communication area, the GPS positioning device 10 and the GPS receiving terminal 1 Is no longer limited as in the conventional example, and as a result, the position of the GPS receiving terminal 1 can be managed in a wider range than in the conventional example.

The GPS positioning system configured as described above is used for nursing care such as detecting the whereabouts of elderly people and wandering elderly people, for security purposes such as detecting the whereabouts of lost children and security guards in play facilities, It is used for managing the position of transport vehicles such as trucks and taxis, and detecting stolen vehicles and stolen bicycles.

In this embodiment, the GPS positioning device 1
0 is provided with a GPS antenna 11, a frequency conversion unit 12, and a correlation detection unit 13. As shown in FIG. 3, a normal GPS receiver 40 including a GPS antenna 41, a frequency conversion unit 42, and a correlation detection unit 43 is provided. The navigation message may be obtained from the GPS receiver 40 by connecting. Further, instead of connecting the GPS positioning device 10 to the wireless communication network WLN, as shown in FIG.
The GPS positioning device 10 is connected to a wired communication network WN (for example, a public telephone line such as ISDN) connected to
Each GPS via the wireless communication network WLN and the wired communication network WN
Communication with the receiving terminal 1 may be performed.

(Embodiment 2) Since Embodiment 2 of the present invention has the same system configuration as Embodiment 2, illustration and description of the system configuration are omitted, and the operation which is a feature of this embodiment is shown in FIG. Will be described based on the operation sequence diagram of FIG.

In this embodiment, the GPS receiving terminal 1 is 2
Built-in timer (not shown) at regular intervals of about 3 hours
, And immediately after the activation, the ID information of the wireless base stations 30 ₁ ...
The PS signal is received, the code phase difference of the pseudo random code of each GPS satellite is detected, and stored in a memory (not shown) together with the ID information. Further, once a day, the GPS receiving terminal 1 calls the GPS positioning device 10 and collectively transmits the ID information and the code phase difference data stored in the memory via the wireless communication network WLN. These controls are performed by the control unit 7.

The GPS positioning device 10 calculates the position of the GPS receiving terminal 1 at each time in the past day based on the received data and displays the position on the display unit 19.

According to the present embodiment, the radio base stations 30 ₁ .
And the data of the code phase difference of the pseudo-random code are collectively transmitted, so that the GPS receiving terminal 1 and the GPS
Communication cost with the positioning device 10 can be reduced,
In addition, since the code phase difference and the ID information are stored as a set in the memory, the position can be calculated even when the GPS receiving terminal 1 moves over several hundred km. In addition, since only a call is made from the GPS receiving terminal 1, it is possible to reduce the cost required for the location registration of the GPS receiving terminal 1 which is indispensable for the incoming call and the power consumption during the standby for the incoming call, thereby reducing the power consumption and the cost. System can be provided.

(Embodiment 3) In the second embodiment, since each GPS receiving terminal 1 needs to search for a GPS satellite, it takes time to acquire the GPS satellite.

Therefore, in the present embodiment, as shown in the operation sequence diagram of FIG.
The activation time at the approximate position of the receiving terminal 1 (2 to 3
The visible satellite information for each time) is calculated in advance and stored in a table in a memory, and the data in the table is transmitted to the GPS receiving terminal 1 via the wireless communication network WLN. In the GPS receiving terminal 1, the GP
By performing a search for a GPS satellite based on the data of the table received from the S positioning device 10, the time required for capturing the GPS satellite can be reduced. As a result, power consumption of the GPS receiving terminal 1 can be reduced.

(Embodiment 4) By the way, the positioning accuracy is deliberately lowered in the ordinary GPS open to the private sector, and it is necessary for the GPS user to improve the positioning accuracy. There is a more well-known differential GPS (DGPS). This D
The GPS is a pseudo-range from each GPS satellite received at a reference station whose exact position has been measured in advance, time information,
The orbit data is compared with the known position data, and an error component for each GPS satellite is calculated. The calculated error component is transferred to another GPS receiver in real time, and by canceling the error, accurate position information can be calculated.

Therefore, in the present embodiment, as shown in FIG. 6, a plurality of the DGPS reference stations 50 are provided every several tens to several hundred km from the area where the GPS receiving terminal 1 moves, and the DGPS reference stations 50 are connected via the wired communication network WN. Respectively connected to the GPS positioning device 10.

The DGPS reference station 50 transmits pseudo-range error information to each GPS satellite measured in each area to the GPS positioning device 10 via the wired communication network WN. GPS
In the positioning device 10, when the position calculating unit 18 calculates the position of the GPS receiving terminal 1,
DGPS reference station 5 in the vicinity of the radio base station 30 ₁ .
Positioning is performed by correcting using the pseudorange error information obtained from 0.

According to the present embodiment as described above, the DGP
Since the pseudo distance from the GPS receiving terminal 1 to each GPS satellite is corrected based on the pseudo distance correction information acquired from the S reference station 50 and the position of the GPS receiving terminal 1 is calculated, the position of the GPS receiving terminal 1 is calculated. There is an advantage that positioning accuracy can be improved.

(Embodiment 5) By the way, at present, JFN
DGPS using FM multiplex broadcasting by 34 members of (National FM Broadcasting Council) and Satellite Positioning Information Center Co., Ltd.
Service is provided. In this service, a DGPS reference station installed by both parties receives a GPS signal from a GPS satellite to create DGPS correction data, transmits this DGPS correction data to the FM station via the center station, and
The broadcast is distributed from a station by DARC (DAta Radio Channel) type FM multiplex broadcasting, the user terminal receives the FM multiplex broadcasting, and corrects the current position in real time.

Therefore, in this embodiment, as shown in FIG. 7, a plurality of DARC receivers 6 for receiving the DGPS correction data (pseudo distance correction information) by the FM multiplex broadcasting are provided.
0 is provided every several tens to several hundred km from the area where the GPS receiving terminal 1 moves, and is connected to the GPS positioning device 10 via the wired communication network WN.

The DARC receiver 60 transmits the received pseudorange error information to the GPS positioning device 10 via the wired communication network WN. In the GPS positioning device 10, when calculating the position of the GPS receiving terminal 1 in the positioning calculating unit 18, the pseudo distance error information obtained from the DARC receiver 60 in the vicinity of the wireless base station 30 ₁ to which the GPS receiving terminal 1 belongs is used. Then, the positioning is performed by correcting.

As described above, according to the present embodiment, the DAR
C based on the pseudo distance correction information received by the receiver 60
Since the pseudo-distance from the PS receiving terminal 1 to each GPS satellite is corrected and the position of the GPS receiving terminal 1 is calculated by calculation, the positioning accuracy of the GPS receiving terminal 1 can be improved, and the cost is uniquely increased. Since there is no need to install a simple DGPS reference station 50, there is an advantage that the cost of the entire system can be reduced.

[0041]

According to the first aspect of the present invention, there is provided one or a plurality of radio base stations which are installed at a known position and transmit radio signals including their own ID information, and a GPS which is spread-spectrum modulated by a pseudo-random code. Frequency conversion means for receiving a signal and converting the signal into a digital intermediate frequency band signal, correlation detecting means for correlating a digital signal in the intermediate frequency band with a pseudo-random code and detecting correlation information between the two, communication to which the self belongs A wireless communication means for receiving ID information from a wireless base station in the area and transmitting the received ID information and the correlation information detected by the correlation detection means as a wireless signal, a correlation detection means, and a control means for controlling the wireless communication means; Done 1
A plurality of GPS receiving terminals, wireless communication means for receiving ID information and correlation information of a wireless base station transmitted from the GPS receiving terminal, a pseudo GPS satellite captured by the wireless base station and the GPS receiving terminal based on the ID information A pseudo-distance calculation unit that calculates a distance and calculates a pseudo-range from a GPS receiving terminal to a GPS satellite based on the pseudo-range and the correlation information; and a GPS receiving unit that calculates a pseudo-range from the GPS receiving terminal to a plurality of GPS satellites. A GPS positioning device having positioning calculation means for positioning the position of the terminal by calculation, so that the GPS receiving terminal does not use the position of the GPS positioning device as in the related art, but the radio base station belonging to the communication area of the GPS receiving terminal. The position of the GPS receiving terminal is measured by the GPS positioning device using the position of
The limitation on the distance to the PS positioning device can be eliminated, and as a result, the position of the GPS receiving terminal can be managed in a wider range than before.

According to a second aspect of the present invention, a GPS receiving terminal is provided with holding means for holding correlation information obtained from a GPS signal received at predetermined reception intervals and ID information of a radio base station. Since the control unit controls the correlation information and the ID information held in the holding unit to be transmitted from the wireless communication unit to the GPS positioning device at every long predetermined time transmission interval, in addition to the effects of the first aspect, G
The cost required for communication between the PS receiving terminal and the GPS positioning device can be reduced, and even when the GPS receiving terminal moves over a long distance, the GPS
There is an effect that the position of the PS receiving terminal can be managed.

According to a third aspect of the present invention, in the GPS positioning device,
GPS signal processing means for receiving a PS signal and acquiring a navigation message of each GPS satellite, and storing data of a GPS satellite in a visible area of each GPS receiving terminal based on the navigation message and ID information of the radio base station. A storage unit and a control unit for transmitting the data stored in the storage unit from the wireless communication unit to the GPS receiving terminal at predetermined time intervals are provided.
The time required for the S receiving terminal to capture a GPS satellite can be shortened, and the power consumption of the GPS receiving terminal can be reduced.

According to a fourth aspect of the present invention, a GPS satellite and a GPS receiving terminal are installed at a known position, receive a GPS signal to acquire a navigation message of each GPS satellite, and based on the navigation message and its own position information. And one or a plurality of DGPS reference stations for generating pseudo distance correction information relating to the pseudo distance and transmitting the pseudo distance correction information to the GPS positioning device by radio signals, and the positioning calculation means of the GPS positioning device obtains the pseudo distance correction information from the DGPS reference station. Since the position of the GPS receiving terminal is determined by calculation by correcting the pseudo distance from the GPS receiving terminal to each GPS satellite based on the pseudo distance correction information, the GPS in addition to the effect of the invention according to claim 1 or 2 is added. There is an effect that the positioning accuracy of the receiving terminal can be improved.

According to a fifth aspect of the present invention, there is provided an FM multiplex broadcasting receiver for receiving pseudo distance correction information transmitted by FM multiplex broadcasting and relaying the pseudo distance correction information to a GPS positioning device, and the positioning operation of the GPS positioning device is performed. The means corrects the pseudo distance from the GPS receiving terminal to each GPS satellite based on the pseudo distance correction information acquired from the FM multiplex broadcast receiver, and
2. The method according to claim 1, wherein the position of the S receiving terminal is determined by calculation.
Or, in addition to the effect of the invention of the second or third aspect, there is an effect that the positioning accuracy of the GPS receiving terminal can be improved at a relatively low cost.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram showing a first embodiment.

FIG. 2 is an operation sequence diagram of the above.

FIG. 3 is another system configuration diagram of the above system.

FIG. 4 is an operation sequence diagram of the second embodiment.

FIG. 5 is an operation sequence diagram of the third embodiment.

FIG. 6 is a system configuration diagram showing a fourth embodiment.

FIG. 7 is a system configuration diagram showing a fifth embodiment.

[Explanation of symbols]

 Reference Signs List 1 GPS receiving terminal 3 Frequency conversion unit 4 Correlation detection unit 5 Wireless communication unit 7 Control unit 10 GPS positioning device 14 Communication interface unit 16 Database unit 17 Pseudorange calculation unit 18 Positioning calculation unit 20 Satellite orbit calculation unit 30 Wireless base station

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Takuya Sueto 1048 Kadoma Kadoma, Osaka Pref.Matsushita Electric Works, Ltd. 72) Inventor Ikuo Tsujimoto 1048 Kadoma, Kadoma, Osaka Prefecture Inside Matsushita Electric Works Co., Ltd. 1048 Kadoma Kadoma Kadoma Matsushita Electric Works Co., Ltd.F-term (reference)

Claims (5)

[Claims] 1. A wireless base station which is installed at a known position and transmits a wireless signal including its own ID information, receives a GPS signal which is spread-spectrum modulated by a pseudo random code, and receives a digital signal. Frequency conversion means for converting into a signal in the intermediate frequency band, correlation detection means for detecting the correlation information between the digital signal in the intermediate frequency band and the pseudo-random code, and detecting the correlation information between them; Wireless communication means for receiving information and transmitting the received ID information and the correlation information detected by the correlation detection means as a wireless signal, one or more GPS units comprising a correlation detection means and a control means for controlling the wireless communication means
A receiving terminal, wireless communication means for receiving ID information and correlation information of a wireless base station transmitted from the GPS receiving terminal, ID
A pseudo distance calculating unit that calculates a pseudo distance between the radio base station and the GPS satellite captured by the GPS receiving terminal based on the information, and calculates a pseudo distance from the GPS receiving terminal to the GPS satellite based on the pseudo distance and the correlation information; A GPS positioning system comprising: a GPS positioning device including positioning calculation means for calculating the position of a GPS receiving terminal by calculation based on each pseudo distance from a GPS receiving terminal to a plurality of GPS satellites. 2. GPS received at predetermined time intervals
The GPS receiving terminal is provided with holding means for holding the correlation information obtained from the signal and the ID information of the wireless base station. GPS from communication means
The GPS positioning system according to claim 1, wherein the control unit controls the transmission so that the positioning device transmits the GPS signal. 3. The GPS positioning device receives a GPS signal and obtains a navigation message of each GPS satellite, a GPS signal processing unit, and the navigation message and an ID of a radio base station.
GP in the visible area of each GPS receiving terminal based on the information
Storage means for storing the data of the S satellite; and data stored in the storage means being transmitted from the wireless communication means to the GP at predetermined time intervals.
The GPS positioning system according to claim 2, further comprising control means for transmitting the signal to the S receiving terminal. 4. It is installed at a known position, receives a GPS signal to acquire a navigation message of each GPS satellite, and uses a GPS message based on the navigation message and its own position information.
One or a plurality of DGPS reference stations for generating pseudo distance correction information relating to a pseudo distance between the satellite and the GPS receiving terminal and transmitting the pseudo distance correction information to the GPS positioning device by a radio signal, wherein the positioning calculation means of the GPS positioning device includes: , DGP
GP based on pseudo distance correction information obtained from S base station
4. The GPS positioning system according to claim 1, wherein a pseudo distance from the S receiving terminal to each GPS satellite is corrected to determine the position of the GPS receiving terminal by calculation. 5. An FM multiplex broadcasting receiver for receiving pseudo distance correction information transmitted by FM multiplex broadcasting and relaying the pseudo distance correction information to a GPS positioning device, wherein the positioning operation means of the GPS positioning device is FM multiplexing. Each GPS is received from the GPS receiving terminal based on the pseudo distance correction information obtained from the broadcast receiver.
4. The GPS positioning system according to claim 1, wherein the position of the GPS receiving terminal is calculated by calculation by correcting a pseudo distance to a satellite.