JPH0921867A - Cooperative transfer method of target between two radars - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make long distance target detection in which is received cueing from another radar possible and make extension of target detection distance possible without giving hindrance to regular target search or target pursuit action in a radar to be cued. SOLUTION: When detection of a target body 3 is transferred to a being-cued radar 2 locating in the flight direction of the tare body 3 from a cueing radar 1 which already pursues the target body 3, target body position information and radio wave sending timing to the target body 3 of the cueing radar 1 itself are transmitted. The being-cued radar 2 synchronizes with radio wave sending timing to the target body 3 of the cueing radar 1 based on information from the cueing radar 1, rotates an antenna 2a in the target body approaching direction, and receives in passive state reflecting wave 12 sent from the target body 3 caused by sending radio wave 11 of the cueing radar 1 to detect the target body 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for coordinating and delivering a target object between two radars, which transfers detection of a target object from a cueing radar to a cueed radar.

[0002]

2. Description of the Related Art A radar is generally used as a detecting device for detecting a flying object. In order to cope with a flying object approaching at high speed, it is necessary to detect the flying object at an early stage, and a method based on queuing is used as a means for extending the detection distance of a radar. The queuing is a method in which the active array radar is provided with information on a target object previously captured by another radar, and the target area is intensively searched for an airspace in a limited direction. By this concentrated search, the search pulse of the radar is accumulated in the approaching direction of the target object to improve the target detection efficiency and extend the detection distance.

FIG. 3 shows a conventional detection method by queuing. In the figure, 1 is a cueing radar and 2 is a cueed radar. The queuing radar 1 detects the target object 3 and tracks the target object 3 by transmitting a radio wave 4 from the antenna 1a in the search direction and receiving a reflected wave 4'from the target object (flying object) 3. .

The cueing radar 1 transmits the position information of the tracked target body 3 to the cueed radar 2 in the flight direction of the target body 3. The cueed radar 2 intensively searches the limited air space in the direction in which the target 3 approaches based on the position information from the cueing radar 1, that is, the target 3 approaches. The radio wave 5 is transmitted from the antenna 2'in the incoming direction and the reflected wave 5'from the target body 3 is received to detect the target body 3.

[0005]

However, since the distance to the target body 3 of the cueed radar 2 is much longer than the distance between the cueing radar 1 and the target body 3,
It is necessary to accumulate a plurality of pulses to improve the detection probability. Therefore, it is difficult for the cueed radar 2 to detect a long-range target that has been cueed by another radar while performing a normal target search or a target that has already been captured.

The present invention has been made in order to solve the above problems. A cueed radar is a long-distance that has been cueed by another radar without hindering a normal target search or tracking activity. It is an object of the present invention to provide a target object symmetry transfer method between two radars capable of target detection and further extending the target detection distance.

[0007]

SUMMARY OF THE INVENTION A target object co-ordination transfer method between two radars according to the present invention is from a first radar which is already tracking a target object to a second radar which is in the flight direction of the target object. When passing the detection of the target body, the target body position information and the radio wave transmission timing of the first radar itself to the target body are transmitted, and the second radar transmits the target radar position information based on the information from the first radar. The target object is detected by passively receiving a reflected wave from the target object by the transmitted radio wave of the first radar by rotating the antenna in the direction of approaching the target object in synchronization with the radio wave transmission timing to the target object. To do.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram showing a target object co-ordination method between two radars according to the present invention. As shown in the figure, the cueing radar 1 and the cueed radar 2 are installed at a distance R, and the cueed radar 2 accurately recognizes the position of the cueing radar 1. . Further, the cueing radar 1 and the cueed radar 2 are connected by a data link, and the internal clocks of both are synchronized in time. The cueing radar 1 transmits a radio wave from an antenna 1a to a target body (flying body) 3 that moves from the cueing radar 1 toward the cueed radar 2 and transmits a reflected wave from the target body 3. The target 3 is received, and the target 3 is detected and tracked.

When the cueing radar 1 passes the detection of the target to the cueed radar 2 which is in the flight direction of the target 3, the cueing radar 2 gives the cueing radar 2 the position information of the target 3 and the cue. The radio wave transmission timing of the ingress radar 1 itself to the target 3 is queued. The cueed radar 2 rotates the antenna 2a in the approaching direction of the target body 3 and switches from the active state to the passive state only when the cueing radar 1 transmits radio waves to the target body 3, and the cueing radar 1 The position of the target body 3 is detected by receiving the reflected wave 12 from the target body 3 by the transmission radio wave 11 of the above, and the normal search / tracking operation is performed at other timings.

Next, the operation of the above embodiment will be described. The present invention is carried out under the following conditions when the detection of the target 3 is transferred from the cueing radar 1 to the cueed radar 2.

1. Target 3 is queuing radar 1
To the queuing radar 2 direction. 2. The queuing radar 1 has already detected the target object 3,
Being tracked.

3. The cueed radar 2 must accurately recognize the position of the cueing radar 1. 4. The queuing radar 1 and the queuing radar 2 are synchronized in time.

5. The queuing radar 1 and the queuing radar 2 should be connected by a data link. Under the above conditions, the detection of the target object 3 is passed from the cueing radar 1 to the cueed radar 2.

(A) The queuing radar 1 queues position information of the target body 3 and transmission timing of the target search radio wave 11 via a data link. When the cueed radar 2 is cueed by the cueing radar 1, the antenna 2a is moved in the direction in which the target 3 approaches in synchronization with the transmission timing of the radio wave 11.
And operate in a passive state. (B) After performing the queuing, the queuing radar 1 continues to transmit the radio wave 11 to the target body 3 at the timing when the queuing radar 2 cues.

(C) The queuing radar 2 receives the reflected wave 12 of the target body of the transmitted radio wave 11 of the queuing radar 1.
Receive passively. (D) The cueed radar 2 is calculated by the following equation.
Distance R1 from the cueed radar 2 to the target 3
Is calculated and the position of the target body 3 is detected together with the direction of the received target body reflected wave 12.

[0016] ^{R1 = (R 2 + R2 2} +2 · R · R2 · cos α) 1/2 where, R1: distance R between the target queuing radar 2 and the target body 3: a queuing radar 1 to be Distance between cueing radar 2 (known by precondition) R2: Distance between cueing radar 1 and target 3 (identified by cueing information) α: Cueing radar 1 and target 3 Angle formed (identified by cueing information) By using the above method, the cueed radar 2 causes the cueing radar 1 to send a radio wave 11 to the target 3.
Since it suffices that the antenna 2a face the target 3 only when transmitting, the normal search / tracking is not hindered. Since the cueing radar 1 is closer to the target 3 than the cueed radar 2, the cueed radar 2 passively receives the target reflected wave 12 of the cueing radar transmission radio wave 11. The received power is stronger than the conventional method, that is, the method of receiving the radio wave transmitted by the cueed radar itself. Therefore, the target detection distance of the cueed radar 2 can be extended, and the timing of delivery of the target from the cueing radar 1 can be advanced.

As shown in FIG. 2, the normal detection distance of the cueing radar 1 and the cueed radar 2 is 1
Assuming that the distance between the queuing radar 1 and the target body 3 is 50 km, and the radio wave reflection area of the target body 3 is equal regardless of the direction, the reception power is increased by 7 dB. The target detection distance of the cueed radar 2 is 224 km. The reflected power is 7
As long as the target object has a reduction in dB, the received power of the target object reflected wave by the method of the present invention can be higher than that of the conventional method. It should be noted that the reflected wave of the target does not always reflect most strongly in the direction of the radio wave transmission source, depending on the shape of the target. Therefore, in the above example, it is assumed that the reflection area of the radio wave transmitted from the queuing radar 2 on the target 3 is the same.

[0018]

As described above in detail, according to the present invention, the cueing radar is
The queuing radar position information and the radio wave transmission timing of the cueing radar itself to the target body are cueed, and the cueed radar sets the antenna in the approaching direction only when the cueing radar transmits the radio wave to the target body. Since it is rotated to operate in a passive state, it does not interfere with normal search / tracking activities by the cueed radar. In addition, by passively receiving the reflected wave of the target wave of the queuing radar transmitted wave by the queuing radar, the queuing radar's proximity to the target object is greater than that of the queuing radar. The total route length can be shortened. Therefore, the received power of the cueed radar becomes stronger than the conventional method of receiving the radio wave transmitted by the cueed radar itself, the target detection distance of the cueed radar is extended, and the target object from the cueed radar is extended. The delivery time of can be accelerated.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a method for passing a target object in harmony between two radars according to an embodiment of the present invention.

FIG. 2 is an operation explanatory diagram in the same embodiment.

FIG. 3 is a diagram for explaining a conventional target object symmetry passing method between two radars.

[Explanation of symbols]

 1 cueing radar 1a antenna 2 cueed radar 2a antenna 3 target object 11 cueing radar transmitted radio wave 12 target object reflected wave

Claims (1)

[Claims] 1. When passing a detection of a target object from a first radar which has already tracked the target object to a second radar in the flight direction of the target object, the target object position information and the first radar itself are transmitted. The second radar transmits the radio wave transmission timing to the target body, and the second radar rotates the antenna in the direction toward the target body in synchronization with the radio wave transmission timing of the first radar to the target body based on the information from the first radar. A target object symmetry transfer method between two radars, characterized in that a reflected wave from a target object by a radio wave transmitted from a first radar is passively received to detect the target object.