JPH04369491A - Moving body tracking system - Google Patents

Abstract

PURPOSE:To effectively chase after a stolen car in case of occurrence of car stealing. CONSTITUTION:The information transmitted from a stolen car is received with an antenna 11 and recovered in a receiver 12 and then controlled and processed in a control part 13. If the proper number of the stolen car which is included in the received information coincides with the proper number stored in a memory 14, a message from a base wireless station is indicated on an indicator 15.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention is installed in a mobile body such as a car and performs data communication between the mobile body and a wireless base station, or between a specific mobile body. , relates to a moving object tracking system that tracks the moving object while confirming its existence.

0002

[Background Art] In recent years, the number of car thefts has been increasing, and in order to track the stolen car and arrest the culprit, tracking technology has been developed to measure the position of the stolen car and track it based on the measured information. It has been developed in various ways. Figure 4 shows a currently used system for tracking stolen cars. In this method, a wireless base station a, a plurality of fixed wireless stations b having unique numbers, and A plurality of mobile radio stations c each have a unique number.

(1) In such a system for tracking a stolen car, a sensor detects the broken glass, broken door lock mechanism, tilt of the car, etc. at the time of theft, and tracks the moving vehicle installed in the car. The output from the sensor is input to the wireless station c, and data including at least the unique number of the mobile wireless station c and a message indicating a theft accident is wirelessly transmitted to the fixed wireless station b in the direction of the arrow d.

(2) Fixed wireless station b sends data including at least its own unique number, the received unique number of the stolen vehicle, and a message indicating that the vehicle has been stolen to wireless base station a in the direction of arrow e, by wire or wirelessly. Send. (3) Radio base station a transmits a calling signal containing at least the unique number of mobile radio station c mounted on the stolen vehicle in the direction of arrow f.

(4) The mobile radio station having the unique number that matches the unique number transmitted by the radio base station a, that is, the mobile radio station c installed in the stolen vehicle in this case, receives the paging signal and transmits the PRN. The encoded positioning signal is transmitted in the direction of arrow g. (5) When a plurality of fixed wireless stations b receive the positioning signal, the fixed wireless station b transmits data including at least the unique number of the fixed wireless station b and the positioning signal reception time to the wireless base in the direction of arrow e. Transmit to station a.

(6) The wireless base station a determines the location of the plurality of fixed wireless stations b based on the difference in reception time between the positioning signals (the wireless base station a can identify the position based on the unique number of the fixed wireless station b). Locate mobile radio station c. Note that in order to specify the location of the mobile radio station c, it is necessary that at least three fixed radio stations b receive the positioning signal transmitted by the mobile radio station c.

[0007] Through the above-described procedure, it is possible to identify the occurrence of a car theft incident and the location of the stolen car at the wireless base station a. Also, regarding the movement of stolen cars, as mentioned above (
By repeating the steps 3) to (6), the location of the stolen vehicle can be known from moment to moment. Next, a method for tracking a stolen vehicle will be explained. Police cars that track stolen cars are equipped with mobile radio stations that have unique numbers, and the procedures (3) to (6) above are carried out for the mobile radio stations installed in all police cars. By performing this at regular time intervals, the wireless base station can recognize its location.

The location of a vehicle equipped with a mobile radio station is shown on a map on a display. Here, the person who gives commands to the police car, that is, the commander, when the occurrence of the theft incident and the current location of the stolen car are known, confirms on the display the police car that is operating near the theft incident, and moves to the police car. This system reports the occurrence of a theft incident, the location information of the stolen vehicle, and unique information of the stolen vehicle (for example, manufacturer name, vehicle model, body color, etc.) that can be known from the unique number. The police car will be able to obtain the location information of the stolen vehicle through communication with the dispatcher, and will be able to track the stolen vehicle.

[0009] If the person who gives commands to the police car, that is, the commander, does not intervene, when the occurrence of the theft incident and the location of the stolen car are determined by the wireless base station, the occurrence of the theft incident and the location of the stolen vehicle are detected.
All police cars are automatically notified of the stolen vehicle's unique information, which can be determined from the stolen vehicle's location information and unique number.

0010

[Problems to be Solved by the Invention] In the conventional method of tracking a stolen vehicle as described above, in which the dispatcher makes an emergency report in the event of a theft incident, it is necessary to confirm the location of the stolen vehicle, confirm the location of the nearest police car, A person who is a dispatcher must give instructions to the police car, which requires human labor, and when multiple theft incidents occur, giving chase instructions is extremely busy. It is. On the other hand, if the dispatcher does not intervene, the above-mentioned drawbacks will be resolved because the police car will be automatically notified of the theft incident. Therefore, the decision as to whether or not to track a stolen car is made by
This will depend on the judgment of the police officer in the police car, which may lead to problems such as police cars operating far away from the stolen car also participating in the chase, or all police cars in action being involved in the chase, which may reduce the efficiency of the investigation. It is extremely inefficient.

In view of the above-mentioned problems, the present invention provides a mobile object tracking system that can automatically issue tracking instructions to police cars and also allows only police cars close to the theft scene to track the stolen car. The purpose is to

0012

[Means for Solving the Problems] In order to solve the above-mentioned problems, a mobile object tracking system according to the present invention includes at least a mobile radio station unique number and a mobile radio station number transmitted from a mobile radio station mounted on a mobile object. A receiving unit that receives first data including a message and second data including a message transmitted by a wireless base station, a display unit that displays a message from the wireless base station, and controls the display unit and the receiving unit. and a storage section that stores a unique address number assigned to a mobile radio station. When the receiving section receives a certain message, the receiving section The address stored in the storage unit stores the address number in the storage unit, and also allows the reception unit to receive the second data for a certain period of time, and if a message from the wireless base station is received within the period, , the control unit controls to extend the reception permission period of the second data again and display the received message on the display unit.

[0013]

[Operation] In order to solve the problem, in the mobile object tracking system according to the present invention having the above-mentioned means, among the police cars equipped with a mobile radio station, only the police cars capable of receiving the signals transmitted by the stolen vehicle use the radio base. It receives information about the stolen vehicle transmitted from the station and uses this information to track the stolen vehicle.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a moving body tracking system according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram of a mobile radio station installed in a police car in the mobile object tracking system according to the present invention, FIG. 2 is a tracking system diagram for explaining a method of tracking a stolen vehicle, and FIG. FIG. 1 is a flowchart showing the flow of control processing in the control unit of the mobile object tracking system according to the present invention shown in FIG.

When the mobile radio station 4 mounted on the stolen vehicle 2 detects the theft state, the mobile radio station 4 transmits information 6 including the unique number of the mobile radio station 4 and information indicating that the vehicle is in the stolen state using the first frequency f1.
Send. The plurality of fixed wireless stations 3 that have received this signal transmit to the wireless base station 1 by wired or wireless means at least information indicating that the vehicle is stolen and the unique number of the mobile wireless station 4 installed in the stolen vehicle 2. Send information including.

[0016] The radio base station 1 that has received the above information,
A calling signal containing at least the unique number of the mobile radio station 4 mounted on the stolen vehicle 2 is transmitted. Next, the mobile radio station 4 installed in the stolen vehicle 2, which has a unique number that matches the unique number transmitted by the wireless base station 1, receives the paging signal and transmits a positioning signal encoded with PRN or the like. That's what I do. When the plurality of fixed wireless stations 3 receive the positioning signal, the fixed wireless stations 3 transmit data including at least the unique number of the fixed wireless station 3 and the positioning signal reception time to the wireless base station 1 by wire or wirelessly. Furthermore, wireless base station 1
is to specify the position of the mobile radio station 4 based on the position of the plurality of fixed radio stations 3 (the radio base station 1 can specify the position by the unique number of the fixed radio station 3) and the reception time difference of the positioning signal. Thus, the location of the stolen vehicle 2 can be specified. Note that the process for positioning the stolen vehicle 2 is repeated at appropriate time intervals.

Each time the wireless base station 1 detects the location of the stolen vehicle 2, the wireless base station 1 transmits data 7 including the unique number of the stolen vehicle 2, the current position, and unique information of the stolen vehicle 2 specified by the unique number. It transmits using the second frequency f2. On the other hand, the police car 8 equipped with the fixed wireless station 5 receives the information 6 transmitted from the stolen vehicle 2 with the antenna 11 as shown in FIG. be. Here, the initial value of the receivable frequency is the first
The frequency is f1, and the receivable range of the signal 6 transmitted by the stolen vehicle 2 is within the range 9 shown by the dotted line in FIG. Therefore, the police car 8 that is in action while existing within this range 9
Only the stolen vehicle 2 can receive the information 6 sent from the stolen vehicle 2.

FIG. 3 shows how the signal demodulated by the receiving section 12 is controlled and processed by the control section 13. When the received information includes a message indicating the theft status, the unique number of the stolen vehicle 2 included in the received information is stored in the storage unit 14 and a timer is set. Once this timer is set, it will time out after a certain period of time. Next, when the receivable frequency is switched to the second frequency f2, the signal 7 transmitted from the radio base station 1 is received in the same manner as when the signal 7 is received at the first frequency f1.

If the unique number of the stolen vehicle 2 included in the received information matches the unique number stored in the storage section 14, the control section 13 controls the stolen vehicle 2's unique number included in the received information. The position and unique number are displayed on a display unit 15 such as an LCD.
and set the timer. The wireless base station 1 will continue to transmit a signal containing the location information of the stolen vehicle 2 until the stolen vehicle 2 is discovered, so the display unit 15 will show the stolen vehicle during that time interval. Information regarding car 2 is displayed.

[0020]

Effects of the Invention The moving body tracking system according to the present invention is constructed as described above and has the following effects. In other words, when a car theft occurs, reporting is done without the intervention of a human such as a dispatcher, which not only saves labor, but also eliminates the need for complex processing during tracking operations. The system has the advantage that the location of the stolen vehicle can be reported only to police cars operating near the stolen vehicle, and the discovery of the stolen vehicle can be confirmed by erasing the display.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a mobile receiving station mounted on a police car in a mobile object tracking system according to the present invention.

FIG. 2 is a tracking system diagram for explaining a method of tracking a stolen vehicle.

FIG. 3 is a flowchart showing the flow of control processing in the control unit of the moving object tracking system according to the present invention.

FIG. 4 is a diagram showing a currently used system for tracking a stolen vehicle.

[Explanation of symbols]

11 Antenna 12 Receiving section 13 Control section 14 Memory section 15 Display section

Claims (1)

[Claims] 1. Reception for receiving first data including at least a unique number of the mobile radio station and a message transmitted from a mobile radio station mounted on a mobile body, and second data including a message transmitted by a radio base station. a display unit that displays messages from the radio base station; a control unit that controls the display unit and the receiving unit; and a storage unit that stores a unique address number assigned to the mobile radio station. When the receiving unit receives a certain message, the address included in the received data stores the address number in the storage unit, and the second
If the reception unit is permitted to receive data and a message from the wireless base station is received within the period, the second
A mobile object tracking system, characterized in that the control unit controls the control unit to extend the data reception permission period again and display the received message on the display unit.