JPH0587584A - Inter-vehicle distance measuring device - Google Patents

Abstract

(57) [Summary] [Object] An object of the present invention is to provide a sensor transponder type inter-vehicle distance measuring device capable of not only simply obtaining an inter-vehicle distance from a partner vehicle but also easily obtaining a relative positional relationship. And [Configuration] Based on the GPS information from the GPS information receiver 1, the information processing unit 3 determines the absolute position of the own vehicle A from the latitude / longitude, and the information processing unit 3 performs the communication while communicating with the opposite opponent vehicle B. The absolute position of the vehicle A and the absolute position of the other vehicle B are compared and calculated to detect the relative positional relationship with each other and the inter-vehicle distance.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sensor transponder type inter-vehicle distance measuring device capable of not only simply obtaining the inter-vehicle distance from a vehicle of the other party but also easily obtaining the relative positional relationship.

[0002]

2. Description of the Related Art Conventionally, as a device for obtaining an inter-vehicle distance from a vehicle on the other side such as a vehicle in front, for example, Japanese Patent Laid-Open No. 50-1119.
A sensor transponder type inter-vehicle distance measuring apparatus as disclosed in Japanese Patent Publication No. 97 is known.

That is, this inter-vehicle distance measuring apparatus first emits a series of intermittent pulse radio waves in which an information signal is coded from an interrogator of the own vehicle and pulse-modulated into a pulse train as interrogation radio waves, and the interrogation radio waves are responded by the other vehicle Let the machine receive it.

The other vehicle demodulates the information signal by demodulating the pulse train coded from the received interrogation radio wave and reflects the response radio wave in response to the reception of the first interrogation radio wave in the arrival direction of the interrogation radio wave. It fires from the responder.

Further, a response radio wave from the other vehicle is received by the interrogator of the own vehicle, and the elapsed time from the start of emission of the inquiry radio wave to the arrival of the response radio wave is measured,
It is configured to measure the distance between the own vehicle and the other vehicle.

[0006]

However, in such a conventional inter-vehicle distance measuring method, although it is possible to measure the inter-vehicle distance to the other vehicle, the relative positional relationship between the other vehicle and the own vehicle is obtained. It has a problem that it is not possible.

On the other hand, in recent years, no matter where a stationary object or a moving object is located, the position is accurately measured in real time in 24 hours without any breaks, that is, based on latitude and longitude. The use of so-called GPS (Global Positioning System) has been studied as a means for measuring position.

The present invention has been made in view of such circumstances, and its purpose is to compare and calculate the absolute positions of the own vehicle and the other vehicle,
An object of the present invention is to provide an inter-vehicle distance measuring device that can easily obtain not only the inter-vehicle distance but also the relative positional relationship.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention encodes a vehicle between a partner vehicle, which is a front vehicle or a rear vehicle, and a host vehicle through respective transceivers. A sensor transponder type inter-vehicle distance measuring apparatus for transmitting and receiving the generated information signal as a coded radio wave is provided with a GPS information receiver,
A processing unit to which the S information receiver and the transceiver are connected, the absolute position based on the latitude and longitude of the own vehicle is obtained based on the reception information from the GPS information receiver, and the reception information from the other vehicle It is characterized by comprising an information processing unit for reading the absolute position of the other vehicle based on the above, and comparing and calculating the absolute positions of the other vehicle to detect the relative positional relationship with the other vehicle and the inter-vehicle distance.

[0010]

According to the present invention, the absolute position of the own vehicle determined from the latitude and longitude is obtained based on the GPS information. Therefore, the absolute position of the own vehicle and that of the other vehicle can be obtained while communicating with the opposite vehicle. The absolute position is compared and calculated, and the inter-vehicle distance is detected together with the relative positional relationship with each other.

[0011]

Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a block diagram showing a schematic configuration of an inter-vehicle distance measuring apparatus according to the present invention. Reference numeral 1 is a GPS information receiver, 2 is a transceiver for communicating with a partner vehicle, and specifically, a communication with a vehicle ahead. It is composed of a transmitter / receiver 2a for carrying out communication and a transmitter / receiver 2b for communicating with a rear vehicle. Also, 3
Is an information processing unit connected to the GPS information receiver 1 and the transceivers 2a and 2b.

The GPS information receiver 1, the transmitters / receivers 2a and 2b, and the information processing unit 3 described above can be constructed by using various conventionally known communication devices and microcomputers. The detailed description is omitted because it belongs to the design change.

Next, the case where the opponent vehicle B is traveling in front of the host vehicle A as shown in FIG. 2 will be described with reference to the sequence operation diagram shown in FIG.

First, the vehicle A receives information from GPS (not shown) by the GPS information receiver 1 (see FIG. 3 (a)-
1) Based on this, the absolute position of the host vehicle A calculated from the latitude and longitude in the information processing unit 3 is obtained (FIG. 3).
(A) -2).

Next, pulse modulation is carried out as a pulse train in which the information on the absolute position of the own vehicle A and the car number is coded, and transmitted as a coded radio wave by the transceiver 2a to the other vehicle B ahead (FIG. 3 (a)-). 3).

On the other hand, the forward vehicle B receives the information from the GPS by its own GPS information receiver 1 '(Fig. 3 (b)-
1), the information processing unit 3'determines the absolute position (FIG. 3 (b) -2).

Then, the front vehicle B receives the coded radio wave from the rear vehicle A (FIG. 3 (b) -3) and, thereafter, processes the read absolute position of the rear vehicle A and its own absolute position. The part 3'compares and calculates the inter-vehicle distance and the relative position of each other (FIG. 3 (b) -4).

Next, the front vehicle B is pulse-modulated as a pulse train in which the information on the measured inter-vehicle distance, relative position and own car number is coded, and is transmitted to the rear vehicle A as a coded radio wave by the transceiver 2b '( Fig. 3 (b)-
5).

The own vehicle A, which is the rear vehicle, receives the coded radio wave transmitted from the front vehicle B by the transmitter / receiver 2a, demodulates the pulse in the information processing unit 3, and the inter-vehicle distance and the relative positional relationship with the front vehicle B. (FIG. 3 (a) -4). This information is then used as a source of information for displays, warnings, automatic braking, etc.

The absolute position on the receiving side is compared and calculated with the absolute position at the same time as the time included in the transmitted coded radio wave.

An example of the coded radio wave is shown in FIG. In the figure (a), the car number of the own vehicle A is "Osaka 55a108.
2 "and its absolute position is" 132 ° 26'4 "east longitude
0 ", north latitude" 57 ° 32'52 "", time "13: 2
The case where the case of 1:15:02 ”is coded as a pulse train is shown. In this case, the hour and minute information is not necessary and therefore omitted.

The forward vehicle B which has received the coded radio wave as described above compares and calculates its own absolute position and the previous absolute position, for example, the inter-vehicle distance is 52 m and the relative position is right. It is measured that the direction is 2 °. In this case, a coded radio wave having a pulse train as shown in FIG.

Although 01 at the right end of the pulse train represents right as shown, it may be represented as 02 in the case of left and 00 in the case of front.

Next, a second embodiment will be described. In this embodiment, the vehicle A does not receive the information from the GPS information receiver 1 and obtains the absolute position of the vehicle A based on the information, but first, the pulse train in which the information of the vehicle number of the vehicle A is encoded. This is a case where the coded radio wave of 1 is transmitted to the other vehicle B ahead by the transceiver 2a.

Therefore, when the forward vehicle B receives the above-mentioned coded radio wave by its transmitter / receiver 2b ', its own GPS
Based on the GPS information received via the information receiver 1 ', the absolute position is obtained in the information processing section 3'.

Next, the front vehicle B transmits to the rear vehicle A by the transmitter / receiver 2b 'as a coded radio wave of a pulse train that encodes the information of its own absolute position and its own car number, and the own vehicle A is in front of the front vehicle B. The transmitter / receiver 2a receives the coded radio wave transmitted from the GPS information receiver 1, and receives the information from the GPS information receiver 1 to obtain the absolute position of the vehicle A based on the information.

Then, the information processing unit 3 performs pulse demodulation to compare and calculate the absolute position of the preceding vehicle B and the absolute position of the own vehicle A to grasp the inter-vehicle distance and the relative positional relationship.

Next, a third embodiment will be described. This embodiment is an example of a case where communication is performed from a front vehicle B to a rear vehicle A. First, the forward vehicle B obtains its absolute position by the GPS information receiver 1 ', and
As a coded radio wave of a pulse train in which the absolute position of the vehicle and the car number are coded, the vehicle 2
Send to.

The rear vehicle A receives the above-mentioned coded radio wave by its transmitter / receiver 2b, obtains its absolute position in the information processing section 3 based on the information from its own GPS information receiver 1, and detects its absolute position. The absolute position of the front vehicle B is compared and calculated to understand the inter-vehicle distance and the relative positional relationship.

Thus, according to the above embodiment, the GPS
Since the absolute position of the own vehicle, which is calculated from the latitude and longitude based on the information, is calculated, the absolute position of the own vehicle and the absolute position of the other vehicle are compared and calculated while communicating with the opposite vehicle. The inter-vehicle distance can be detected together with the relative positional relationship.

Therefore, it is possible to accurately grasp the speed condition of the own vehicle A, the location of the own vehicle A, the relative relationship with the opponent vehicle B and the distance between the vehicles, etc. in real time. You can drive well.

[0032]

As described above, according to the present invention, it is possible to obtain the absolute position of the vehicle determined by the latitude / longitude in the information processing section based on the GPS information received by the GPS information receiver. In addition, it is possible to compare and calculate the absolute position of the own vehicle and the absolute position of the other vehicle while communicating with the other vehicle on the opposite side, so it is possible to accurately detect the relative position relationship and the inter-vehicle distance in real time. As a result, safer and more operable operation can be performed as compared with the conventional method.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration of an inter-vehicle distance measuring device according to the present invention.

FIG. 2 is a plan view showing an example of a communication state.

FIG. 3 is a sequence operation diagram showing an example of a communication state.

FIG. 4 is an explanatory diagram showing an example of a pulse train of coded radio waves.

[Explanation of symbols]

 1 GPS information receiver 2 Transceiver 2a Front transceiver 2b Rear transceiver 3 Information processing unit

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shoji Kamata 10 Odoron-cho, Hanazono-cho, Ukyo-ku, Kyoto

Claims (1)

[Claims] 1. A sensor transponder type inter-vehicle distance measurement in which a coded information signal is transmitted and received between a host vehicle which is a front vehicle or a rear vehicle and an own vehicle via respective transceivers. The device is a processing unit that includes a GPS information receiver and is connected to the GPS information receiver and the transceiver, and the latitude and longitude of the vehicle based on the information received from the GPS information receiver. Information processing to obtain the absolute position based on the other vehicle, read the absolute position of the other vehicle based on the information received from the other vehicle, and compare and calculate the absolute position of each other to detect the relative positional relationship with the other vehicle and the inter-vehicle distance. An inter-vehicle distance measuring device having a section.