JP2003066130A - Positioning system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a convenient positioning system in which positional data are corrected readily by a simple arrangement using an existing GPS positional information portable terminal. SOLUTION: A positioning system is provided with a means for receiving positional signals of GPS and D-GPS, a means for receiving the positional signals of GPS and D-GPS from the receiving means and calculating the difference between both positional signals, and a means for storing the calculated value as a correction value of positional data is further provided with a means for correcting the positional signal from a portable terminal based on the correction value stored in the storing means, and a means for displaying the positional signal corrected by the correcting means on the map of a screen.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a positioning system that uses GPS satellites to acquire position data of latitude and longitude and detect the position of a vehicle or the like.

[0002]

2. Description of the Related Art Generally, GIS (Geographic)
The Information System) uses various information stored in a database including map data, arranges necessary information on a map, and is used for various purposes and purposes. For example, there is a system such as a car navigation system that detects the position of a moving body such as a vehicle and displays the current position on a map stored in a database. At that time, to detect the position of moving objects such as vehicles,
Generally, GPS (Global Positionin)
g System) has been used.

When GPS is used for detecting the position of a vehicle, for example, as shown in FIG. 6, a position signal transmitted from a GPS satellite 101 is received by a receiving antenna 103 of a receiver 102.
Received at, and the latitude and longitude of the vehicle as location information,
It is adapted to be taken into a processing device 104 such as a personal computer and arranged on a map.

[0004]

However, with respect to the positioning accuracy of GPS, in actual operation results, a positioning error of about 5 to 25 m occurs depending on the number and position of satellites, geographical conditions, and the like. In addition, the positioning error due to the difference in the antenna sensitivity of the small mobile terminal becomes very large.

Therefore, in the GIS that uses the map information of a personal computer, the scale of the residential map is about 1/1600, and the road width is clearly displayed on the map. Since the positioning error became large, it was not possible to accurately display the position of the vehicle or the like on a map such as a residential map.

[0006] In addition, the position information portable terminal is usually GP
Since the position is searched by S, the positioning error is large and G
In a position search system that fuses IS and GPS, vehicles and the like cannot be accurately placed on a micro map.
Therefore, GPS has a troublesome problem that it can be used only in a macro map.

Therefore, as a measure for improving the positioning accuracy, the D-GPS (Diffe) which corrects the GPS position data received at the reference station and transmits the correction data using FM radio waves.
rental Positioning System
m) is proposed. When this D-GPS is used to detect the position of a vehicle, for example, as shown in FIG.
After receiving the signal from the satellite 101 at the reference station 105,
The center station 106 corrects the position data, and the FM broadcasting station 107 transmits the correction data to the processing device 104 such as a personal computer by using the FM radio wave. As a result, in the D-GPS, highly accurate position data with an error of 1 m or less can be obtained. As described above, in D-GPS, a highly accurate positioning system can be obtained, while facilities and devices are complicated and large-scale, and the entire system is
There was a problem of becoming expensive.

By the way, in the method of sequentially calculating the traveling distance of the vehicle and correcting the position data, there is a problem that the system becomes complicated, the apparatus becomes large, and the cost becomes high. Couldn't be.

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to simply correct position data with a simple structure even if an existing GPS position information portable terminal is used. To provide an accurate positioning system.

[0010]

SUMMARY OF THE INVENTION The present invention relates to a GPS position data correction system.
The receiving means for receiving the position signals of PS and D-GPS, the calculating means for receiving the position signals of GPS and D-GPS from the receiving means, and calculating the difference between the two position signals, and the calculating means A storage unit that stores the value as a correction value of the position data, and a correction unit that corrects the position signal from the mobile terminal based on the correction value stored in the storage unit; And a display means for displaying the position signal on a map of the screen.

Further, the computing means includes a communication server that receives a position signal from the portable terminal, and is connected to the portable terminal via a communication network. Further, by storing the correction value of the position signal as a database in the storage means and incorporating it in the map information system for use, the above object of the present invention can be achieved more effectively.

Further, the receiving means includes a GPS receiving device for receiving a D-GPS position signal, and the reception of FM and the reception of GPS are selectively switched by a switching operation. The purpose of can be achieved.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION A positioning system according to the present invention will be described below with reference to the drawings.

FIG. 1 shows a schematic configuration of a positioning system for a mobile body using GPS. In the figure, it is a position signal data processing device 1, and the data processing device 1 is provided with receiving means 2 for receiving the GPS and D-GPS position signals, respectively. The receiving means 2 includes a GPS antenna 3 and a D-GPS antenna 4, and the GPS antenna 3
Receives the position signal from the GPS satellite 5. On the other hand, the D-GPS antenna 4 is adapted to receive the position correction data from the reference station 6 and the position signal from the GPS satellite 5.
The position signal is received, the positioning error is calculated, and the position correction data is transmitted by FM multiplex broadcasting. Here, the D-GPS correction data is stored in the GPS and D-
A correction value is obtained by collecting GPS position data and calculating a positioning error from the D-GPS position data as a reference from the comparison data at the same position and the same time. ing.

Further, the data processing device 1 is provided with a computing means 7 connected to the receiving means 2, and from the receiving means 2 the GP
It receives the S and D-GPS position signals and calculates the difference between the two position signals. That is, the correction value is obtained by calculating the difference from the GPS position signal with the D-GPS position signal as a reference.

Further, the data processing device 1 is provided with a storage means 8 for storing the value calculated by the arithmetic means 7 as a correction value of the position signal via the central processing unit 20, and the same position and the same position are stored in advance. A database of correction values is created based on the time comparison data, and the database can be appropriately referred to.

The data processing apparatus 1 is provided with a communication server 9 connected to the central processing unit 20, and from the portable terminal 10 for small position information to the communication server 9 via a communication network such as a telephone line or the Internet. It is designed to connect. As a result, the mobile terminal 10 uses the GPS
The position signal from the satellite 5 is transmitted to the communication server 9 via the network.

Further, the data processing device 1 comprises a correction means 11 connected to the calculation means 7, and corrects the position signal from the portable terminal 10 based on the correction value stored in the storage means 8. Has become.

Further, the data processing device 1 is provided with a display screen 12 such as a display as a display means connected to the correction means 11, and the position signal corrected by the correction means 11 is displayed on the map of the display screen 12. It is supposed to be displayed.

Next, FIG. 2 shows the processing steps of the positioning system.
And it demonstrates based on FIG.

First, in FIG. 2, in step S1 and step S2, the position data of the reference station is input from the GPS antenna 2 and the D-GPS antenna 3 to the receiving means 2 as latitude and longitude information. In step S3, the calculation means 7 calculates the difference between the position data to obtain a correction value. Then, in step S4, the calculated correction value is stored in the storage means 8 as a database using the measured position and the measured time as indexes.

Next, in FIG. 3, in step S5, G
Position data from the PS satellite 5 is received from the mobile terminal 10 via the communication network and the communication server 9.
Further, in step S6, the position data is corrected by the correction means 11 based on the correction value of the database, and in step S7, the corrected position data is incorporated into the map information system to mount, for example, a small mobile terminal. The position of the vehicle is arranged on a map such as a residential map or a road map.

Therefore, in the above-described embodiment, the base station constituted by a simple device such as a personal computer is provided to collect the correct position data of the reference station by the D-GPS system in order to create the correction value data. Along with the normal G
Position data is acquired by the PS system. And
By calculating the difference between the GPS position data and the D-GPS position data, the correction value is stored in the storage means as a database. As a result, if a large amount of comparison data is calculated and a database of correction values corresponding to the positioning position and the positioning time is expanded, the correction process of GPS position data can be easily performed by the base station. The position of the moving body can be detected easily and accurately.
Therefore, the positioning accuracy is improved, and even if the GPS position data is incorporated into a map information system such as a residential map,
Can be accurately placed on the map.

As a modification of the above embodiment, the receiving means 2 is provided with a GPS receiving device 13 for receiving a D-GPS position signal and an FM receiving device 14 for receiving FM and GPS. It is conceivable that reception is selectively switched by the switching device 15 and used. 1
Reference numeral 6 is an FM antenna that receives FM radio waves.

Thus, for example, first, the receiving means 2 is caused to function as an FM receiving device, the position data of the vehicle or the like is measured, and then the receiving means 2 is caused to function as a GPS receiving device, whereby the vehicle or the like is obtained. The position data of may be collected twice by switching operation,
It is possible to obtain the same effect as that of the above embodiment.

The switching device 15 is not limited to a switch for switching the internal wiring of the receiving means 2 to GPS or D-GPS, and the operator manually operates the internal wiring of the receiving means 2. You may switch by.

When the position (latitude, longitude) of the measurement point is known from the beginning, it is necessary to measure the position data of the measurement point using D-GPS to create the correction value data. Absent. Therefore, as shown in FIG. 5, a system for receiving the position correction data from the reference station, for example, DG
The PS antenna and the like can be omitted.

[0028]

As described above, according to the positioning system of the present invention, the receiving means for receiving the GPS and D-GPS position signals, and the receiving means for receiving the GPS and D-GPS position signals, respectively. Comprising: a calculation means for calculating the difference between the two position signals; and a storage means for storing the value calculated by the calculation means as a correction value for the position data, and the position signal from the portable terminal is stored in the storage means. Since it is configured to include a correction unit that corrects the position signal based on the corrected value and a display unit that displays the position signal corrected by the correction unit on the map of the screen, Since the GPS position data is corrected based on the correction value of the database stored in the storage means,
The positioning error due to the difference in antenna sensitivity can be eliminated, and the position of the moving body can be accurately detected with a simple configuration, and even when used in a map information system, the position of the moving body such as a vehicle can be displayed on the map. Can be placed accurately. Therefore, the position data obtained by GPS can be obtained as accurately as D-GPS, and the position data can be incorporated in a map information system such as a residential map. Further, in this positioning system, the base station is provided with a communication server, a GPS antenna, and a DG.
A personal computer equipped with a PS antenna may be provided, and it may be connected to a personal computer or the like having a memory for storing a database of correction values from a mobile terminal via a network and a communication server. It is possible to reduce the cost of equipment and facilities. Further, since the base station has a simple structure, the base station can be easily installed anywhere. In the experiment, the positioning system according to the present invention has obtained a positioning error within 1 m.

[Brief description of drawings]

FIG. 1 is a block diagram showing a system configuration example of the present invention.

FIG. 2 is a flowchart showing a process of generating a correction value for position data.

FIG. 3 is a flowchart showing a processing flow of position data.

FIG. 4 is a schematic block diagram showing a receiving system by a receiving means.

FIG. 5 is a diagram showing a modification of the system configuration of the present invention.

FIG. 6 is a diagram showing a GPS data processing process.

FIG. 7 is a diagram showing a data processing process of D-GPS.

[Explanation of symbols]

1 Data processing device 2 Receiving means 3 GPS antenna 4 D-GPS antenna 5 GPS satellites 6 base stations 7 computing means 8 storage means 9 Communication server 10 mobile terminals 11 Correction means 12 Display means 13 GPS receiver 14 FM receiver

Claims (5)

[Claims] 1. Receiving means for receiving GPS and D-GPS position signals, and GPS and DG from the receiving means.
The position signal of PS is received, the calculating means which calculates the difference of both position signals, and the storage means which memorize | stores the value calculated by this calculating means as a correction value of position data were memorize | stored in this memory means. A positioning system comprising: a correction unit that corrects a position signal from a mobile terminal based on a correction value; and a display unit that displays the position signal corrected by the correction unit on a map on a screen. 2. The positioning system according to claim 1, wherein the arithmetic means includes a communication server connected to the mobile terminal via a communication network, and receives a position signal from the mobile terminal. 3. The positioning system according to claim 1, wherein the correction value of the position signal is stored as a database in the storage means and is incorporated into a map information system for use. 4. The receiving means includes a GPS receiving device for receiving a D-GPS position signal, and receives FM and G signals.
The positioning system according to claim 1, wherein reception of PS is selectively switched by a switching operation. 5. Receiving means for receiving a GPS position signal,
Arithmetic means for receiving the GPS position signal and calculating a difference between the position signal and known position data at a measurement point; and storage means for storing the value calculated by the arithmetic means as a correction value of the position data. Correction means for correcting the position signal from the mobile terminal based on the correction value stored in the storage means, and display means for displaying the position signal corrected by the correction means on a map on the screen. A positioning system comprising: