JP3314490B2 - Mobile location management system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile location management system using GPS.

[0002]

2. Description of the Related Art In recent years, there has been an increasing need for a business support system based on mobile location management. The signpost and the GPS are used for the basic position determination of the moving body. Recently, GPS is often used since signposts require equipment according to the location control point. However, in the position locating using GPS, even if dead reckoning is included, the locating accuracy is not good. On the other hand, Japanese Patent Application Laid-Open No. 4-174487 and Japanese Patent Application Laid-Open No.
In Japanese Patent Application Laid-Open No. 8-208, a position of a base station calculated by a GPS receiver at a base station is compared with position data of the base station input in advance to obtain correction data.
The position data of the moving body is sent from the receiver, and the position of the moving body is corrected from the position data of the moving body and the correction data. A so-called DGPS (Differential GPS) positioning method is applied to improve the position monitoring accuracy of a moving object.

[0003]

However, the positioning accuracy of the GPS alone is still constant on the moving body side, and the precise position of the moving body is not known, which is not satisfactory from a practical point of view.

An object of the present invention is to provide a mobile position management system capable of detecting a position with high accuracy in both a base station and a mobile.

[0005]

SUMMARY OF THE INVENTION The present invention is a system formed by a base station having a GPS receiver and having a known location, and a mobile having the GPS receiver.
The base station and the mobile unit can perform two-way communication using the MCA communication system, and the base station transmits correction data for correcting an error between its own position measured using a GPS receiver and a true position. The base station and the mobile unit communicate the correction data and the mobile unit position data measured using the mobile unit's GPS receiver at the same timing between the base station and the mobile unit by the MCA communication system. And to calculate the position of the moving body with high accuracy , and
The base station receives the mobile location data and correction data received from the mobile.
The position of the moving object is determined based on the
In both cases, the position evaluation result can be transmitted to the mobile station.
When the mobile station receives the position evaluation result from the base station,
Displays the position evaluation result and ranks from the base station.
If the evaluation result has not been received,
Data and calculate and display moving body position data.
The mobile location management system urchin as its gist.

[0006]

In the base station, correction data for correcting an error between the position of the own station measured by using the GPS receiver and the true position is generated. Then, the correction data and the GP
The moving object position data measured using the S receiver is the MCA
The base station and the mobile unit communicate with each other at the same timing by the communication system of the system, and the base station and the mobile unit calculate the position of the mobile unit with high accuracy. Mobile station
Will receive the location result from the base station,
In addition to displaying the position evaluation result, the position evaluation is performed from the base station.
If no correction result has been received, the
To calculate and display moving object position data
Therefore, when the position evaluation result is received from the base station,
High-precision positioning of the mobile body without recalculation at the mobile station
Can be displayed.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is embodied in a truck position management system in the transportation business will be described below with reference to the drawings.

FIG. 1 shows the overall configuration of the track position management system of this embodiment. The present system includes one base station 1 and a large number of mobile units (transportation trucks) 2. The base station 1 includes a GPS antenna 3, a GPS receiver 4, a mobile position management device 5, a display unit 6, an MCA communication device 7,
And a CA communication antenna 8. The GPS antenna 3 receives radio waves from a plurality of GPS satellites.
The GPS receiver 4 receives the GPS signal received by the GPS antenna 3
The positioning of the base station 1 is performed based on the propagation time of the radio wave of the satellite.
The mobile object position management device 5 is connected to the GPS receiver 4, the MCA communication device 7, and the display unit 6.
The positioning time, the combination of GPS satellites, and the positioning result are obtained for all combinations of GPS satellites that can be received at present.
The position of the moving body 2 is displayed on the display unit 6. Further, the mobile object position management device 5 stores the position of the base station 1 in advance. MC
The A communicator 7 sets the MC according to the instruction of the mobile position management device 5
A radio wave is output from the A communication antenna 8 to the MCA control station 9, and a radio wave from the MCA control station 9 is received through the MCA communication antenna 8.

A mobile unit (transportation truck) 2 includes a GPS antenna 10, a GPS receiver 11, a position management device 12, a display unit 13, an MCA communication unit 14, and an MCA communication antenna 1.
And 5. The GPS antenna 10 receives radio waves from a plurality of GPS satellites. GPS receiver 11
Performs the positioning of the mobile unit 2 based on the propagation time of the radio wave of the GPS satellite received by the GPS antenna 10. The position management device 12 includes a GPS receiver 11, an MCA communication device 14, and a display unit 1.
3 and connected to the GPS receiver 11 for positioning time,
The combination of the GPS satellites and the positioning result are obtained, and the position of the mobile unit 2 is displayed on the display unit 13. The MCA communicator 14 outputs a radio wave from the MCA communication antenna 15 to the MCA control station 9 in accordance with the instruction of the position management device 12,
Radio waves from the CA control station 9 are received through the MCA communication antenna 15.

As described above, in the present embodiment, the base station 1 and the mobile unit 2 can perform bidirectional communication in the MCA communication system. Next, the operation of the track position management system thus configured will be described.

FIG. 2 is a flowchart showing the operation of the mobile station position management device 5 on the base station side and the flowchart showing the operation of the position management device 12 on the mobile object side. The mobile position management device 5 of the base station 1 obtains the positioning time and the positioning result for all combinations of GPS satellites currently available from the GPS receiver 4 in step 200, and obtains the difference from the known base station position. To calculate the correction value of each combination (hereinafter, referred to as positioning correction data). Then, the mobile unit position management device 5 determines whether or not to start the communication in step 201. If the communication is to be started, the correction data for positioning is used in step 202. If the position of the mobile unit 2 is located, the positioning result, the mobile unit code Preparation of transmission data such as After that, the mobile object position management device 5
In step 203, transmission data is transmitted through the MCA communication device 7 and the MCA communication antenna 8. This data is M
It is sent to the MCA communication device 14 via the MCA communication antenna 15 of the mobile unit 2 via the CA control station 9. After transmitting the transmission data in step 203, the mobile position management device 5 of the base station 1 resets the communication start condition in step 204.

On the other hand, the location management device 12 of the mobile unit 2 determines in step 104 whether or not data is received from the base station 1 by the MCA system. If the data is received, the received data is decoded in step 105. Then, the position management device 12 updates the positioning correction data in step 106. Further, the location management device 12 determines whether or not the location is determined by the base station 1 in step 107.
At 08, the location determined by the base station 1 is set as the position of the mobile unit 2. At step 110, the location determined by the base station 1 is displayed on the display unit 13. Further, the position management device 12 executes step 1
If there is no reception by the MCA system from the base station 1 in 04, or if there is no orientation by the base station 1 in step 107, the mobile unit 2 obtained by using the GPS receiver 11 in step 100 described later in step 109 is used alone. For the positioning result, a position correction calculation (current position determination) is performed using positioning correction data corresponding to the GPS satellite combination. Then, the position management device 12 executes step 11
At 0, the current position of the moving body 2 is displayed on the display unit 13.

Further, the position management device 12 of the mobile unit 2 calculates the positioning time of the mobile unit 2 and the determination of the combination of GPS satellites in step 100, and determines in step 101 whether or not communication has started. When the position management device 12 determines that communication has started, in step 102, it prepares transmission data including the positioning time, the combination of GPS satellites, the positioning result obtained in step 100, and the code of the mobile unit 2 concerned. And
In step 103, the position management device 12
Then, the transmission data is transmitted through the MCA communication antenna 15. This data is transmitted to the MCA communication device 7 via the MCA communication antenna 9 of the base station 1 via the MCA control station 9. If the position management device 12 determines in step 101 that the communication has not been started, it proceeds to steps 102 and 1.
The process moves to step 104 without performing the process of step S03.

On the other hand, the mobile object position management device 5 of the base station 1
Determines in step 205 whether data is received from the mobile unit 2 by the MCA system.
At 06, the received data is decoded. Further, the mobile unit position management device 5 performs a position correction calculation of the mobile unit 2 based on the positioning correction data corresponding to the positioning time and the GPS satellite combination in step 207. And the mobile object position management device 5
Sets the communication start condition in step 208,
In step 209, the position of the moving body 2 is displayed on the display unit 6.

As described above, in the mobile position management device 5 on the base station 1 side, the positioning time and the positioning result are obtained for the GPS receiver 4 for all currently available combinations of GPS satellites.
Then, the difference from the known base station position is calculated and recorded as the correction value (positioning correction data) of each combination,
When transmitting by the A system, when the positioning correction data and the position of the mobile unit are located, the transmission data including the result is generated and transmitted, and when receiving by the MCA system, the positioning time from the mobile unit 2, the GPS satellite combination, Based on the positioning result, the current position of the mobile unit 2 is located with high accuracy using the correction data for positioning (using time and combination correspondence data) and transmitted.

On the other hand, in the position management device 12 on the side of the mobile unit 2, the positioning time, G
The transmission data including the combination of the PS satellites and the positioning result is generated and transmitted, and upon reception by the MCA system, the correction data for positioning is updated, and the base station 1 updates the data to the high-precision location. If the target position is not received, the positioning of the moving object alone is performed, the correction operation is performed using the positioning correction data corresponding to the GPS satellite combination, and the current position is determined with high accuracy.

The following conditions can be considered for the communication start condition. (B) When business requirements arise,
(B) at a predetermined time, (c) at a predetermined time, (d) at a predetermined distance, (e) at the time of passing through a set place, (f) under a set environment (whether or not it is a communicable place, in an urban area) Or (g), (g) every predetermined time or every predetermined traveling distance in the effective range of the positioning correction data, (h) occurrence of an emergency, (i) combinations of the above, (nu) other high-precision positions When orientation is required.

As described above, in the present embodiment, the base station 1 and the mobile unit 2 can be bidirectionally communicated by the MCA communication system, and the base station 1 measures its own station position using the GPS receiver 4. Correction data for correcting an error between the mobile station 2 and the true position, and the correction data and the mobile body position data measured using the GPS receiver 11 of the mobile body 2 are transmitted to the base station by the MCA communication system. 1 and the mobile unit 2 communicate with each other, and the base station 1 and the mobile unit 2 calculate the position of the mobile unit 2 with high accuracy. Therefore, highly accurate position detection can be performed in both the base station 1 and the mobile unit 2.

The present invention is not limited to the above-described embodiment. In the above-described embodiment, the base station 1 calculates a high-accuracy location by bidirectional communication between the base station 1 and the mobile unit 2. The moving body 2 may calculate.

In the above embodiment, all the GPS satellites currently available are used. However, the number of combinations can be reduced by determining the GPS satellite to be used. Further, in the above-described embodiment, the combination of all currently available GPS satellites is used. In this case, occurrence of a combination change is added to the communication start condition.

Further, in the above embodiment, the G of the base station 1
The positioning result is obtained from the PS receiver 4 and the mobile object position management device 5 is obtained.
Performs the calculation of the correction data, but the positioning result is not limited to the position, but may be a pseudorange of a GPS satellite. In this case, the mobile object position management device 5 also performs the positioning calculation.

In the above embodiment, the present invention is embodied in a truck position management system in the transportation business, but may be embodied in a position management system for a taxi or the like.

[0023]

As described in detail above, according to the present invention,
An excellent effect that high-precision position detection can be performed in both the base station and the mobile body is exhibited.

[Brief description of the drawings]

FIG. 1 is a schematic diagram illustrating an overall configuration of a mobile location management system according to an embodiment.

FIG. 2 is a flowchart for explaining the operation of the mobile location management system according to the embodiment;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Base station, 2 ... Mobile body, 4 ... GPS receiver, 5 ... Mobile body position management apparatus, 7 ... MCA communication antenna, 8 ... MCA communication antenna, 9 ... MCA control station, 11 ... GPS receiver, 1
2: Location management device, 14: MCA communication device, 15: MCA
Communication antenna.

Continuation of front page (56) References JP-A-4-174387 (JP, A) JP-A-4-354098 (JP, A) JP-A-5-232210 (JP, A) JP-A-6-289120 (JP) , A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G01S 5/00-5/14 G08G 1/00-9/02

Claims (1)

(57) [Claims] 1. A system formed by a base station having a GPS receiver and having a known position and a mobile unit having a GPS receiver, wherein the base station and the mobile unit are provided by an MCA communication system. And the base station generates correction data for correcting an error between the position of the own station measured using a GPS receiver and a true position at the base station. The mobile station position data measured using the receiver is communicated at the same timing between the base station and the mobile station by the communication system of the MCA system at the same timing as each other, and the position of the mobile station at the base station and the mobile station is accurately determined. together so as to calculate the said base station, a mobile location data received from the mobile
Based on the correction data, the position of the moving object is
Data and location evaluation results to the mobile station.
The mobile station receives the position assessment result from the base station.
In addition to displaying the position assessment result,
If the position evaluation result has not been received, the received correction
A moving object position management system, which calculates and displays moving object position data based on data .