JPH06317649A - Vehicle position identification device - Google Patents

Abstract

PURPOSE:To find an update vehicle position at a low installation cost by providing a GPS receiver, a border jumping detecting device, a transmitter and a display device. CONSTITUTION:A data processing part 4 compares the vehicle current position with a predetermined border and generates a border jumping signal when the vehicle crosses the border. The border is a border for dividing a service area of a taxi into some blocks. When the vehicle moves to an adjacent block, a border jumping signal is generated. When the processing part 4 generates a border jumping signal, a wireless device 5 transmits current position data together with vehicle identification data from an antenna 6. The transmitted radio wave from the vehicle 1 is received 13 through an antenna 12 of a base station 11, the position data and the vehicle identification data are detected 11 and the detected current position is displayed with a vehicle number on a display part 15. As transmission is conducted when the vehicle jumps a border, congestion of transmission is not so much and the current position of the vehicle can be recognized in a short time. Furthermore, as it is not necessary to provide many sign posts, the installation cost is low.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for identifying the current position of a vehicle such as a taxi.

[0002]

2. Description of the Related Art For example, a taxi company needs to know the current position of each vehicle in order to use the vehicle efficiently. In general, when a user requests a vehicle to be dispatched, the base station of the taxi company wirelessly sends the location of the user to each car, and an empty vehicle near the specified location is sent. The base station knows the current position of the vehicle by returning the identification number of the vehicle to the base station.

However, in such a method of inquiring by voice and reporting of the current position by using the radio, the driver neglects the contents of the radio communication and the operation of the radio to neglect the driving. There is also a problem that the voice from the wireless device is noisy.

Therefore, the operating area of the taxi is divided into several areas, each vehicle is equipped with a low-power transmitter, and a sign post for detecting a radio wave transmitted from each vehicle is provided at a predetermined location in the area. There is a method called "sign post method" which detects that a vehicle has moved from one area to another area.

In addition, "GPS (Global Posi)
There is also proposed a position identification device using a satellite for position identification called "ioning system". That is, each vehicle is provided with a GPS receiver to constantly measure the current position, and the current position of all the vehicles is grasped by sequentially polling each vehicle from the base station via radio.

[0006]

However, in the above-mentioned "signpost system", it is necessary to install a large number of signposts in a case where the taxi operating area is wide, which causes a problem of cost and labor. . Especially, if you want to know the vehicle position in detail, you need more sign posts. In addition, since a wired or wireless communication line for transmitting the position information obtained by each sign post to the base station is required, the cost for securing this communication line is high.

Further, in the "GPS system", it is necessary to poll all the vehicles, but if the number of taxi vehicles is very large, it takes time to know the positions of all the vehicles. is there. For example, if there are 600 vehicles and polling takes 1 second, it takes 1 to complete one cycle.
It takes 0 minutes, and there is a problem that the latest vehicle position cannot be known.

[0008] Therefore, an object of the present invention is to provide a vehicle position identification device which is inexpensive to install and can know the latest position of a vehicle.

[0009]

In order to achieve the above-mentioned object, a vehicle position identification device of the present invention is a GPS receiving device for receiving radio waves from GPS satellites to measure the current position of the vehicle, and the GPS receiving device. A cross-border detection device that generates a cross-border signal when the current position measured by means of a predetermined boundary line and a transmission that transmits data indicating the current position when the cross-border signal is output from the cross-border detection device And a display device for receiving the data indicating the current position of the vehicle transmitted from the transmitter and displaying the current position of each vehicle.

[0010]

The current position of the vehicle is measured by receiving radio waves from GPS satellites, and the current position data is transmitted when the vehicle crosses a predetermined boundary line. The receiving side displays the current position of the vehicle based on this current position.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The features of the present invention will be specifically described below based on embodiments with reference to the drawings.

FIG. 1 is a schematic diagram showing an embodiment of a vehicle position identification device of the present invention. Each vehicle 1 has a GPS
A receiver is provided. GPS receiver is GPS
Antenna 2 for receiving radio waves from the satellite and received G
The GPS core unit 3 calculates the reception position from the PS signal and outputs it as longitude / latitude data. The longitude / latitude data from the GPS core unit 3 is supplied to the data processing unit 4.

The data processing unit 4, as shown in FIG.
PU 4a, interfaces 4e, 4f, ROM 4c, R connected to the CPU 4a via a bus 4b
It is composed of AM4d and the like. The GPS core unit 3 and the data processing device 4 are connected via a GPS interface 4e, and the data processing device 3 and the wireless device 5 are connected via a wireless device interface 4f.

The data processing unit 4 compares the current position of the vehicle with a predetermined boundary and generates a cross-border signal when the vehicle crosses the predetermined boundary. The boundary means a boundary when the taxi service area is divided into some sections 21 to 24 as shown in FIG. In the example of FIG. 3, when the vehicle moves in the same section as when moving from point A to point B, no cross-border signal is generated, but as in the case when the vehicle moves from point B to point C A cross-border signal is generated when moving to the section.

The radio device 5 transmits the current position data together with the vehicle identification data from the antenna 6 when the data processor 4 generates a cross-border signal.

The radio wave transmitted from the vehicle 1 is transmitted to the base station 11
The data is received by the wireless device 13 through the antenna 12, the position data and the vehicle identification data are detected by the data processing unit, and the detected current position is displayed on the display unit 15 together with the vehicle number.

When a plurality of vehicles 1 cross the boundary at the same time, the transmitted radio waves may overlap and the normal reception may not be possible. If it is not received, the vehicle 1 may retransmit it. That is, the position data and the vehicle identification data are transmitted from the vehicle 1, and when the radio wave from the vehicle 1 can be received by the base station 11, a reception confirmation signal is transmitted from the base station together with the vehicle identification data, and the vehicle 1 side transmits the reception confirmation signal. When the reception confirmation signal addressed to itself cannot be received within a certain time from, the position data is transmitted again. In this re-transmission, the re-transmission is started after a random waiting time in each vehicle 1, so that it is possible to avoid the collision of the transmitted radio waves again.

Since the GPS system is originally a geodetic system for military purposes, the number of available satellites may decrease or the accuracy may decrease in an emergency. In this case, the position of each vehicle may be reduced. Measurement accuracy is reduced. Therefore, instead of providing the GPS receiving device only on the vehicle 1, a similar GPS receiving device may be provided on the base station 11 to correct the position data from each vehicle 1. That is, since the position of the base station 11 is fixed, the correction data when the position of the base station 11 measured by GPS is corrected so as to match the actual position is obtained, and this correction data is used as the position data of each vehicle. By applying to, it is possible to know the exact position of each vehicle.

[0019]

As described above, according to the present invention, the current position of the vehicle is measured by GPS and the transmission is performed when the vehicle crosses a predetermined boundary, so that the transmission may be congested. It is possible to identify the current position of each vehicle in a short time and in a short time. In addition, the installation cost is low because it is not necessary to provide a large number of sign posts.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a schematic configuration of a vehicle position identification device of the present invention.

FIG. 2 is a block diagram showing an internal configuration of a data processing unit.

FIG. 3 is an explanatory diagram showing boundaries of service areas.

[Explanation of symbols]

1 ... Vehicle, 2 ... Antenna, 3 ... GPS core part, 4 ... Data processing part, 5 ... Radio, 6 ... Antenna, 11 ... Base station,
12 ... Antenna, 13 ... Radio, 14 ... Data processing unit,
15 ... Display

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Enshijima Tetsuhi 1-9-27 Yanagikawachi, Minami-ku, Fukuoka City Eiritsu Electronic Industry Co., Ltd.

Claims (1)

[Claims] 1. A GPS receiver that receives radio waves from GPS satellites to measure the current position of a vehicle, and a cross-border signal when the current position measured by the GPS receiver crosses a predetermined boundary line. And a transmitter that transmits data indicating the current position when a cross-border signal is output from the cross-border detection device, and a data that indicates the current position of the vehicle transmitted from the transmitter. And a display device for displaying the current position of each vehicle.