JPH09281228A - Secondary radar system and vehicle identification system using the radar system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the vehicle identification system which surely identifies friend or foe of plural vehicles under any condition. SOLUTION: In the vehicle identification system using secondary radar systems, each of plural vehicles is provided with a querying machine 1 or a responding machine 2. The machine 1 aims at a desired machine 2, irradiates the machine 2 with a laser ranger 18 and asks questions through a question pulse generating circuit 17, a transmitter 16, a duplexer 13 and a querying antenna 12. The machine 2 detects the laser irradiation by a laser detector 5, measures the direction of the irradiation and responds to the received querying signals. The machine 2 includes a directional antenna 3, a duplexer 6, a receiver 7, a video processing circuit 8, a querying signal decoding circuit 9, a response pulse generating circuit 10, a transmitter 11 and an antenna direction controller 4. If the machine 1 receives the response, a receiver 14 and a signal processing circuit 15 decodes the response and conducts friend or foe identification operations.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plurality of vehicles using a secondary radar system having an interrogator and an answering machine, in which the answering machine returns a response signal in response to an inquiry signal from the interrogator. In particular, the present invention relates to a vehicle identification system capable of surely identifying an enemy and a friend of a plurality of vehicles in any case.

[0002]

2. Description of the Related Art Generally, a secondary radar system having an interrogator and an answering machine, in which the answering machine returns a response signal in response to an interrogation signal from the interrogator, is used to identify a plurality of vehicles. Vehicle identification systems that perform identification are known. Hereinafter, a conventional example of the vehicle identification system will be described with reference to FIG. FIG. 4 is an illustration of an identification state of a conventional example of a vehicle identification system. As shown in FIG. 4, in this case, the interrogator is installed in the A car, and the answering machines are installed in each of the B, C, D, and E cars. Here, the operation in the case where the vehicle A is trying to identify whether it is an enemy or a friend of the vehicle B will be described with reference to the timing chart of FIG. 5 and FIG. First, as shown in FIG. 5 (a), when the laser is output from the interrogator of the above-mentioned car A toward the above car B, as shown in FIG. The laser is detected. When the responder of car B detects the laser, it becomes ready for reception as shown in FIG. 5C, and the interrogator of car A interrogates from the SUM pattern antenna as shown in FIG. 5D. When the signal is transmitted and the SLS signal is transmitted from the DIFF pattern (see FIG. 4), only the answering machine of the vehicle B receives the inquiry signal. That is, the answering machines of the C vehicle, the D vehicle, and the E vehicle do not detect the laser from the interrogator of the A vehicle and are not in the reception preparation state, and therefore do not receive the interrogation signal.

Next, as shown in FIG. 5 (e), when the interrogation signal is a normal signal, the answering machine of the vehicle B transmits a response signal from the omnidirectional antenna. Here, since the laser range finder of the interrogator of the A car has already received the laser reflection signal from the B car, a reception trigger is applied to the interrogator, as shown in FIG. 5 (f). A response gate is generated. Therefore, the interrogator of the car A extracts the response signal corresponding to the response gate from the response signals received after the application of the laser reception trigger, and the extracted signal is a normal response signal (the car B). Response signal), an identification result according to the content of the response signal is output. here,
For example, when there is an interfering signal from the answering machine of the E car, the interrogator of the A vehicle receives the interfering signal together with the response signal from the answering machine of the B car. Since the gate can be correlated with the time (distance), only the response signal from the vehicle B transponder can be regarded as the normal response signal.

[0004]

However, the conventional vehicle identification system as described above has a problem that identification becomes difficult in the following cases. That is, when the problem occurs, as shown in FIG. 6, the interrogator is installed in each of vehicles A and F, and the answering machine is installed in each of vehicles B, C, D, and E. If
It is time for the car A to discriminate between the car B's enemy and ally, and the car F to discriminate between the car C's enemy or ally. The operation at the time of the above problem will be described below with reference to the timing chart of FIG. First, as shown in (a) and (b) of FIG. 7, laser is output from the laser rangefinder of the interrogator of the A vehicle toward the B vehicle, and the laser of the interrogator of the F vehicle is output. A laser is output from the distance measuring device toward the C vehicle. Then, as shown in FIG.
As shown in (d), the lasers from the vehicles A and F are detected by the transponders of the vehicles B and C, respectively.
As shown in FIGS. 7E and 7F, the answering machines of the vehicles B and C are ready for reception. And FIG. 7 (g),
As shown in (h), each of the interrogators of cars A and F is S
When the interrogation signal is transmitted from the UM pattern antenna, the transponders of the vehicles B and C receive both interrogation signals from the vehicles A and F (see FIG. 6). However,
Here, the interrogation signal of the car A is received by the answering machine of the car C, and the interrogation signal of the interrogator of the car F is received by the answering machine of the car B. Then, there was a case where a failure occurred in the subsequent transmission operation.

Next, as shown in FIGS. 7 (k) and (l), in each of the transponders of the vehicles B and C, when the inquiry signal is a regular signal, the response signal is transmitted from the omnidirectional antenna. Send. Here, since the laser range finder of each of the interrogators of the A car and the F car has already received the laser reflection signal from the B car and the C car, it is received by each of the interrogators of the A car and the F car. A trigger is applied and a response gate is generated as shown in FIGS. 7 (i) and 7 (j). Therefore, although the interrogator of the A car operates so as to extract the response signal corresponding to the response gate from the response signals received after the application of the laser reception trigger, both the B car and the C car operate. Since the response signal from the answering machine is received, there is a problem that it is difficult to extract the response signal from the vehicle B, which should be originally extracted (see FIG. 7 (m)). Further, if there is no response signal from the answering machine of the B vehicle in the above state, there is a problem that the response signal from the answering machine of the C vehicle is mistaken for the response signal from the B vehicle. as a result,
Vehicle A may be identified as an ally even if vehicle C is an enemy, and there is a high possibility that vehicle B and vehicle C will be confused. On the other hand, the interrogator of the F car also operates to extract the response signal corresponding to the response gate from the response signals received after the application of the laser reception trigger.
Since the response signals from the responders of both the B car and the C car are received, it is difficult to extract the response signal from the C car that should be originally extracted. If there is no response signal from the answering machine, the same problem arises that the response signal from the answering machine of the vehicle B is mistaken for the response signal from the vehicle C and is determined.
The present invention has been made in view of the above circumstances, and provides a secondary radar system having an interrogator and an answering machine, in which the answering machine returns a response signal in response to an interrogation signal from the interrogator. An object of the present invention is to provide a vehicle identification system capable of surely identifying an enemy or an ally of the plurality of vehicles when identifying a plurality of vehicles using the same.

[0006]

In order to achieve the above object, the present invention is a secondary radar system for identifying a transponder by returning a response signal from the transponder to an interrogation signal from the interrogator. In the above, the interrogator is a laser irradiation means for aiming a laser at a responder desired to respond and irradiating a laser, a question signal sending means for sending a question signal after the laser irradiation, and a response signal from the responder. Receiving means for receiving, the responder, laser detection means for detecting the laser emitted from the interrogator, and the interrogation signal from the interrogator only when the laser is detected by the laser detection means A response signal transmitting means for transmitting a response signal to the laser detecting means, the laser detecting means having a function of detecting an incident direction of the laser, and the response signal transmitting means. Characterized in that toward the incident direction of the detection laser by The detection means is configured so as to deliver the response signal. Another feature of the present invention is a vehicle identification system that identifies a plurality of vehicles by using a secondary radar that identifies the answering machine by returning a response signal from the answering machine in response to an inquiry signal from the interrogator. In the above, each of the plurality of vehicles is equipped with the interrogator or responder, the interrogator is a laser irradiation unit that irradiates a laser by aiming at a responder that desires a response, and an interrogation signal after the laser irradiation. An inquiry signal transmitting means for transmitting
Only when the responder has a receiving means for receiving a response signal from the responder, the responder detects a laser emitted from the interrogator, and only when the laser is detected by the laser detector. A response signal transmitting means for transmitting a response signal to the inquiry signal from the interrogator, the laser detecting means having a function of detecting the incident direction of the laser, and the response signal transmitting means, It is characterized in that the response signal is transmitted in the incident direction of the laser detected by the laser detection means. Another feature of the present invention is that the receiving means of the transponder comprises:
It is to receive only the interrogation signal from the direction in which the laser signal is incident. Another feature of the present invention is that the response signal transmitting means controls the direction of the directional antenna and the antenna direction control for directing the beam direction of the directional antenna to the incident direction of the laser detected by the laser detecting means. It is to have a vessel.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below based on the illustrated embodiments. FIG. 1 is a configuration diagram showing an embodiment of a secondary radar of a vehicle identification system according to the present invention.
This vehicle identification system uses a secondary radar system having an interrogator 1 and a responder 2 as shown in FIG. 1, and normally, a plurality of interrogators 1 and responders 2 are provided in a plurality of vehicles.
Are installed and used respectively. As shown in FIG. 1, the transponder 2 includes a directional antenna 3 for a transponder, an antenna direction controller 4 connected to the directional antenna 3, and a laser detector connected to the antenna direction controller 4. Bowl 5
A duplexer 6 connected to the directional antenna 3, a receiver 7 connected to the duplexer 6,
A video processing circuit 8 connected to the receiver 7, an interrogation signal decoding circuit 9 connected to the video processing circuit 8 and the laser detector 5, and a response pulse generation circuit 10 connected to the interrogation signal decoding circuit 9. And a transmitter 11 connected to the response pulse generating circuit 10 and the duplexer 6. The interrogator 1 includes, as shown in FIG. 1, an interrogator antenna 12, a duplexer 13 connected to the antenna 12, and the duplexer 13.
To the receiver 14, a signal processing circuit 15 connected to the receiver 14, a transmitter 16 connected to the duplexer 13, and an inquiry pulse connected to the transmitter 16 and the signal processing circuit 15. It has a generation circuit 17 and a laser range finder 18 connected to the signal processing circuit 15. A feature of the vehicle identification system according to the present invention resides in the function of the transponder 2, in which the transponder antenna 3 is a directional antenna, and the directivity is based on the laser angle information detected by the laser detector 5. The beam direction of the antenna 3 is controlled.

Next, the operation of the vehicle identification system having the above configuration will be described. Here, the operation at the time of the problem described in the problem to be solved by the invention will be described with reference to the identification state explanatory diagram of FIG. 2 and the timing chart of FIG. First, as shown in FIG. 2, when the above problem occurs, the interrogators are installed in vehicles A and F, and vehicles B, C, D,
When the answering machine is installed in each of the E and E vehicles, the A vehicle tries to identify whether the B vehicle is an enemy or an ally, and the F vehicle identifies whether the C vehicle is an enemy or an ally. It is time to First, as shown in FIGS. 3A and 3B, laser is output from the laser distance measuring device 18 of the interrogator 1 of the A car to the B car, and the interrogator of the F car is also output. Laser is output from the first laser range finder 18 toward the C vehicle. Then, as shown in FIGS. 3 (c) and 3 (d), the laser detector 5 of the transponder 2 of the vehicles B and C is used.
Then, the lasers from the vehicles A and F are detected respectively, and as shown in FIGS. 3 (e) and 3 (f), the transponders 2 of the vehicles B and C are ready for reception.

Here, the antenna direction controller 4 of the transponder 2 determines the direction in which the directional antenna 3 is received based on the laser angle information detected by the laser detector 5. Control so that As a result, the receiving direction of the directional antenna 3 of the answering machine 2 of the B car is the direction of the A car, and the receiving direction of the directional antenna 3 of the answering machine 2 of the C car is the direction of the F car. Become. As shown in FIGS. 3 (g) and 3 (h), when each interrogator 1 of the A vehicle and the F vehicle transmits an interrogation signal from the interrogator antenna 12, the directional antenna 3 of the responder 2 of the B vehicle is transmitted. Since the reception direction of the vehicle is toward the vehicle A, the answering machine 2 of the vehicle B receives only the inquiry signal from the vehicle A, and the directional antenna 3 of the answering machine 2 of the vehicle C is received. Since the direction is toward the F car, the answering machine 2 of the C car receives only the interrogation signal from the F car (see FIG. 2). As shown in FIG. 1, the interrogation signal received by the directional antenna 3 of each transponder 2 is input to the interrogation signal decoding circuit 9 via the duplexer 6, the receiver 7 and the video processing circuit 8, and It is determined whether the interrogation signal is a legitimate signal.

Next, in each of the transponders 2 of the B car and the C car, when the inquiry signal is a normal signal, the response pulse generating circuit 10 generates a response pulse, and the response pulse is transmitted by the transmission. As shown in FIGS. 3 (k) and 3 (l), the response signal is transmitted from the directional antenna 3 via the machine 11 and the duplexer 6, but the transmission direction of the directional antenna 3 of the response machine 2 of the B vehicle is transmitted. Is directed to the above-mentioned vehicle A, and the transmission direction of the directional antenna 3 of the answering machine 2 of the above-mentioned vehicle C is directed toward the above-mentioned vehicle F. Therefore, the response signal from the above-mentioned vehicle B is that of the above-mentioned vehicle A. Only the interrogator 1 receives it, and the response signal from the car C is received only by the interrogator 1 of the car F. Therefore, the response signal from the answering machine 2 of the B car is received by the interrogator 1 of the F car, or the response signal from the answering machine 2 of the C car is received by the interrogator 1 of the A car. There is no possibility that it becomes difficult to extract the response signal.

If there is no response signal from the answering machine 2 of the B-vehicle, the interrogator of the A-car mistakes the response signal from the answering machine of the C-car for the response signal from the B-vehicle. There is no judgment. More specifically, the reception operation of the interrogator 1 will be described in detail.
Since the laser reflected signal from the car has already been received, a reception trigger is applied to the signal processing circuit 15 of each of the interrogators of cars A and F, and the response gate is displayed as shown in FIGS. 3 (i) and 3 (j). Is being generated. Therefore, the signal processing circuit 15 of each of the interrogators 1 of the vehicles A and F extracts the response signal corresponding to the response gate from the response signals received after the application of the laser reception trigger, and extracts the response signal. When the signal is a normal response signal, it operates so as to output an identification result according to the content of the response signal.

[0012]

As described above, the present invention uses the directional antenna as the transponder antenna and controls the beam direction of the directional antenna based on the laser angle information detected by the laser detector. As a result, the interrogators are installed in cars A and F, and cars B, C, D, and E
If the answering machine is installed in each car,
While trying to identify whether the car is an enemy or a friend of the above-mentioned car B,
When the F car is trying to identify whether it is an enemy or a ally of the C car, the interrogator of the A car outputs the response signal output from the responder of the C car and the response signal output from the responder of the B car. Even when they are output at the same timing, it is possible to reliably extract only the response signal of the vehicle B, and to reliably identify the enemy and ally of the vehicle B.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of a secondary radar of a vehicle identification system according to the present invention.

FIG. 2 is an explanatory diagram of an identification state of a vehicle identification system using the secondary radar shown in FIG.

3 (a) to 3 (l) are timing charts of the identification operation of the vehicle identification system using the secondary radar shown in FIG.

FIG. 4 is an explanatory diagram of an identification state of a conventional vehicle identification system.

5A to 5F are timing charts of the identification operation of the vehicle identification system shown in FIG.

FIG. 6 is an explanatory diagram of an identification state when a problem occurs in the conventional vehicle identification system.

7A to 7M are timing charts of the identification operation of the vehicle identification system shown in FIG.

[Explanation of symbols]

1 ... interrogator, 2 ... responder, 3 ... directional antenna for responder, 4 ... antenna direction controller, 5 ... laser detector,
6, 13 ... Duplexer, 7, 14 ... Receiver, 8 ... Video processing circuit, 9 ...
Interrogation signal decoding circuit, 10 ... Response pulse generation circuit, 11, 16 ... Transmitter,
12 ... Interrogator antenna, 15 ... Signal processing circuit,
17 ... Interrogation pulse generation circuit, 18 ... Laser range finder,

Claims (6)

[Claims] 1. A secondary radar system for identifying a transponder by returning a response signal from a transponder to an interrogation signal from the interrogator, wherein the interrogator desires a response. A laser irradiating means for irradiating a laser aiming at, a question signal transmitting means for transmitting an inquiry signal after the laser irradiation, and a receiving means for receiving a response signal from the responder, wherein the responder is A laser detecting means for detecting the laser emitted from the interrogator, and a response signal transmitting means for transmitting a response signal to the interrogation signal from the interrogator only when the laser detecting means detects the laser. And the laser detection means has a function of detecting an incident direction of the laser, and the response signal sending means is provided in the incident direction of the laser detected by the laser detection means. A secondary radar system, characterized in that it is configured to send a response signal toward it. 2. The secondary radar system according to claim 1, wherein the receiving means of the transponder receives only the interrogation signal from the direction in which the laser signal is incident. 3. The response signal sending means includes a directional antenna and an antenna direction controller for controlling the beam direction of the directional antenna to be directed to the laser incident direction detected by the laser detecting means. The secondary radar system according to claim 1, further comprising: 4. A vehicle identification system for identifying a plurality of vehicles using a secondary radar for identifying the answering machine by returning a response signal from the answering machine in response to an inquiry signal from the inquiry machine. , The interrogator or answering machine is mounted on each of the plurality of vehicles, the interrogator is a laser irradiation means for irradiating a laser with aiming at a responder desired to respond, and an interrogation signal after the laser irradiation. A laser detecting means for transmitting a question signal transmitting means for transmitting and a receiving means for receiving a response signal from the responder, wherein the responder detects a laser emitted from the interrogator; and the laser detecting means. And a response signal sending means for sending a response signal to the interrogation signal from the interrogator only when the laser is detected by A vehicle identification system having a detecting function, wherein the response signal emitting means is configured to send a response signal in the incident direction of the laser detected by the laser detecting means. 5. The vehicle identification system according to claim 4, wherein the receiving means of the transponder receives only the interrogation signal from the direction in which the laser signal is incident. 6. The response signal transmitting means includes a directional antenna and an antenna direction controller for controlling the beam direction of the directional antenna to be directed to the laser incident direction detected by the laser detecting means. The vehicle identification system according to claim 4, characterized by comprising: