JPH10170644A - Radar control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of tracking impossible short distance targets by setting a TOT(time-on target) upper limit value to a long distance target smaller than an upper limit value of a short distance target. SOLUTION: A tracking control device 6 prepares a tracking item with every target, and inputs it to a target range classifying device 8. The target range classifying device 8 classifies targets exceeding a maximum detecting distance into long distance targets and those not more than that into short distance targets on respective tracking targets. A short distance target TOT upper limit value setting device 9 holds the whole target tracking possible values within the maximum detecting distance as a TOT upper limit value to the short distance targets, and outputs them to a tracking synchronous processor 7 by adding this TOT upper limit value data to tracking items of the short distance targets. A long distance target TOT upper limint value setting device 10 holds a value smaller than an upper limit value of the short distance targets, and outputs it to the tracking synchronous processor 7 by adding this upper limit value data to a long distance target tracking item. The tracking synchronous processor 7 performs PRF synchronous processing between antenna surfaces when TOT upper limit value data-added respective target tracking items are inputted, and decides an item of a tracking beam, and sends it to a beam control device 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, a radar control device for a fixed-on-ground or on-board radar.

[0002]

2. Description of the Related Art FIG. 6 is a block diagram of a conventional electronic scanning radar having a function of synchronizing transmission timing by PRF synchronization processing of beams irradiated on a plurality of antenna surfaces.
, 1 is an antenna, 2 is a signal processing control device, 3
Is a tracking information processing device that creates tracking beam information in response to a tracking request sent from the signal processing control device 2, 4 is a radar control device that creates tracking beam data based on the tracking information sent from the tracking information processing device 3, and 5 is a radar. This is a beam control device that performs beam scanning with the tracking beam specifications sent from the control device 4.

FIG. 7 is a block diagram of a device relating to the generation of a tracking beam of the conventional radar control device 4. In FIG.
6 is a tracking control device that creates tracking data for each tracking target, 7
Is a tracking synchronization processing device that performs PRF (pulse repetition cycle) synchronization processing between antenna surfaces from tracking data created for each tracking target.

In an electronic scanning radar having a plurality of antenna surfaces, in order to avoid interference of beams radiated from the plurality of antenna surfaces, PRF synchronization processing must be performed on a tracking beam radiated on each antenna surface to synchronize transmission timing.
In the conventional method, in the PRF synchronization process, a time-on target (hereinafter referred to as TO) which is a tracking beam irradiation time for one target.
It is called T. ) Has an upper limit, so that it is possible to avoid allocating a long beam irradiation time to one target and irradiating another target with the tracking beam. This TOT upper limit is the same value for all targets. When the tracking synchronization processing device 7 performs PRF synchronization of the beam with respect to the target on each antenna surface, the tracking synchronization processing device 7 performs PRF synchronization processing in the order of input from the tracking information device 3 to the radar control device. The tracking beam data obtained by this PRF synchronization processing is sent to the beam controller 5.

[0005]

FIG. 8A shows a situation in which a radar is at the center and a plurality of targets exist around the radar. Target A within the circumference centered on the radar
1 to A5 are short-range targets having a high threat level for the radar, and targets B1 to B3 outside the circumference are long-range targets having a low threat level for the radar. In the conventional processing, the upper limit of the TOT is set to the same value for the long-distance tracking target and the short-distance tracking target.

At this time, the conventional radar control device has the following problems. FIG. 8B shows a situation where only the short distance targets A1 to A5 exist.
If the target distance is short, the tracking beam irradiation time can be shortened. Therefore, in FIG. 8B, it is assumed that the tracking beam can be irradiated to all short-distance targets. A long-distance target in which the upper limit value of TOT is set on another antenna surface occurs, and the situation of FIG. 8B changes to the situation of FIG. 8A, and A1 and B1, A2 and B2, and A3 and B3. Consider a case where PRF synchronization processing is performed in combination. In this situation, the TOFs of the short distance targets A1 to A3 in FIG.
T is set to the TOT upper limit. Goals A1 to A3
Is set to be larger than the actually required value, the A4 and A5 may not be able to irradiate the tracking beam.

As shown in the above example, when there are many short-range targets on one plane and only long-range targets on another antenna plane, the PRF of the tracking beam between the antenna planes
As a result of the synchronization processing, the TOT of the short distance target becomes the T of the long distance target.
The value is reset to the same value as the OT, and as a result, the TOT is applied unnecessarily to the short distance target. In such a case, even when all short-range targets can be tracked when there is no long-range target, a situation arises in which the short-range target cannot be tracked due to the presence of long-range targets. For land-based or on-board radar, short-range targets have a higher threat rating than long-range targets, and situations in which long-range targets are tracked and short-range targets are not tracked must be avoided.

The present invention has been made to solve such a problem, and has as its object to manage a beam irradiation time so as to preferentially track a short-distance target having a high threat level.

[0009]

In the radar control apparatus according to the present invention, the upper limit of the TOT of a long-distance target is set in advance as a value smaller than the upper limit of the short-distance target, and the TOT of the short-distance target is set. The control is performed so that the size does not become larger than necessary due to the PRF synchronization processing with the long-distance target existing on another antenna surface.

Further, the radar control device according to the present invention comprises:
The upper limit value of the TOT of the long-distance target is calculated for each antenna surface from the number of long-distance tracking of each antenna surface and the maximum sum of the TOT of the short-distance target of each antenna surface for each radar beam management calculation cycle. Thus, the upper limit value of the TOT of the long-distance target of the entire radar system is calculated so that the short-distance target can be preferentially tracked.

Further, the radar control device according to the present invention comprises:
By generating information that only the short-range target is tracked, the tracking beam of the long-range target is not irradiated, and the tracking beam is irradiated only to the short-range target.

Further, the radar control device according to the present invention comprises:
The tracking beam for the short-distance target and the tracking beam for the long-distance target are PRF-asynchronous, and the short-distance targets or the long-distance targets are processed as PRF-synchronous, so that the short-distance target tracking beam is preferentially irradiated. Things.

[0013]

According to the present invention, the upper limit of the TOT for a long-distance target is set to be smaller than the upper limit of the TOT for a short-distance target. , And as a result, it becomes possible to reduce the number of short distance targets that cannot be tracked due to PRF synchronization processing with long distance targets.

Further, according to the present invention, the upper limit value of the TOT for a long distance is calculated so as not to increase the TOT of a short distance target in each radar beam management calculation cycle. The TOT for the distance target is not increased unnecessarily, and as a result, the number of short distance targets that cannot be tracked due to the PRF synchronization processing with the long distance target can be set to zero.

Further, according to the present invention, in order to track only a short-distance target without tracking a long-distance target, when performing PRF synchronization processing between antenna surfaces, the TOT for the short-distance target is compared with the PRF synchronization processing with the long-distance target. Therefore, the number of short-range targets that cannot be tracked due to PRF synchronization processing with a long-range target can be set to 0 as a result.

Further, according to the present invention, the short-range target and the long-range target are asynchronous, and the tracking beam for the short-range target is preferentially irradiated. PRF with long distance target
The number of short-range targets that cannot be tracked due to the PRF synchronization process with the long-range target can be reduced to zero as a result of preventing the size from becoming unnecessarily large for the synchronization process.

[0017]

【Example】

Embodiment 1 FIG. FIG. 1 shows a radar control apparatus according to a first embodiment of the present invention. In FIG. 1, 6
Is a tracking control device, 7 is a tracking synchronization processing device, 8 is a target range classification device, 9 is a short-range target TOT upper limit value setting device, 1
0 is a long-distance target TOT upper limit value setting device.

The principle of operation of the radar control device configured as described above will be described with reference to FIG. The tracking control device 6 creates tracking data for each target, and uses this data as a target range classification device 8.
Enter The target range classification device 8 classifies each tracking target into a long-range target exceeding the maximum detection distance or a short-range target less than the maximum detection distance. Short distance target TOT upper limit setting device 9
Holds a value such that all targets within the maximum detection distance can be tracked as the TOT upper limit value for the short-distance target, adds the data of the TOT upper limit value to the tracking data of the short-distance target, and performs tracking synchronization processing device 7. Output to The long-distance target TOT upper limit value setting device 10 holds a value smaller than the TOT upper limit value for the short-distance target as the TOT upper limit value for the long-distance target, and adds the data of this TOT upper-limit value to the tracking specifications of the long-distance target. And outputs it to the tracking synchronization processing device 7. The tracking synchronization processing device 7 receives the tracking data of each target to which the data of the TOT upper limit is added, performs PRF synchronization processing between the antenna surfaces, determines the data of the tracking beam, and performs beam control on the data. Send to device 5.

Embodiment 2 FIG. FIG. 2 shows a radar control device according to a second embodiment of the present invention. In FIG. 2, 6 is a tracking control device, 7 is a tracking synchronization processing device,
8 is a target range classification device, 9 is a short-range target TOT upper limit value setting device, 11 is an antenna unit maximum TOT sum calculation device,
12 is an antenna unit long-distance target TOT upper limit value calculating device,
Reference numeral 13 denotes a long-distance target TOT upper limit value calculating device.

The principle of operation of the radar control device configured as described above will be described with reference to FIG. The tracking control device 6 creates tracking data for each target, and uses this data as a target range classification device 8.
Enter The target range classification device 8 classifies each tracking target into a long-range target exceeding the maximum detection distance or a short-range target less than the maximum detection distance. Short distance target TOT upper limit setting device 9
Holds a value such that all targets within the maximum detection distance can be tracked as the TOT upper limit value for the short-distance target, adds the data of the TOT upper limit value to the tracking data of the short-distance target, and performs tracking synchronization processing device 7. Output to Antenna unit maximum T
The OT sum calculation device 11 calculates the total sum of the TOTs of the short-range targets for each antenna plane, and calculates the TOD of the short-range target of each antenna plane.
The sum of T, the maximum value of the sum of TOT, and the number of long-distance targets existing on each antenna surface are represented by the antenna-distance long-distance target TOT.
Output to the upper limit value calculation device 12. The antenna unit long-distance target TOT upper limit value calculating device 12 calculates the antenna unit maximum TO
The upper limit value of the TOT for the long-distance target is calculated for each antenna surface from the data input from the T sum calculation device 11.

TOT for long-distance targets for each antenna plane
When calculating the upper limit of, if there is no long distance target on the antenna surface for which the TOT upper limit is being calculated, the TOT upper limit for the long distance target is set to the same value as the TOT upper limit for the short distance target. T for long-range targets per antenna plane
When calculating the upper limit of the OT, if the long-distance target exists and the short-distance target does not exist on the antenna surface for which the TOT upper limit is being calculated, that is, if the situation shown in FIG. The TOT upper limit value for the target is calculated as follows.

[0022]

(Equation 1)

Where tot _far is the TOT upper limit value for a long-distance target on the antenna surface being processed, tot _far
max is the maximum value of the sum of the TOT of the short-range target for each antenna surface input from the antenna unit maximum TOT sum calculation device 5,
"far _tgt" is a target number at a long distance on the antenna surface on which processing is being performed.

On the other hand, when calculating the upper limit value of the TOT for the long-distance target for each antenna surface, both the long-distance target and the short-distance target exist on the antenna surface for which the TOT upper limit value is being calculated. When the sum of the TOTs of the targets is equal to the maximum value of the sum of the TOTs for each antenna surface, that is, in the situation shown in FIG. 5B, the upper limit of the TOT for the long-distance target is calculated as follows.

[0025]

(Equation 2)

Here, t is the maximum value of the tracking time in the radar beam management calculation cycle.

When calculating the upper limit of the TOT for the long-distance target for each antenna plane, both the long-distance target and the short-distance target exist for the antenna plane for which the TOT upper-limit value is being calculated. When the sum of the target TOTs is smaller than the maximum value of the sum of the TOTs for each antenna surface, that is, in a situation as shown in FIG. 5C, the upper limit of the TOT for the long-distance target is calculated as follows.

[0028]

(Equation 3)

Here, tot _near is the sum of TOT of a short-range target of the antenna surface on which processing is being performed.

The long-distance target TOT upper limit value calculating device 13
The minimum value of the TOT upper limit value for the long-distance target for each antenna surface calculated by the antenna unit long-distance target TOT upper limit value calculation device 12 is detected, and this is set as the TOT upper limit value for the long-distance target of the entire radar system. Is added to the tracking specification of the long-distance target and output to the tracking synchronization processing device 7. The tracking synchronization processing device 7 receives the information of the tracking target to which the data of the TOT is added, and outputs the PRF between the antenna surfaces.
The synchronization processing is performed to determine the specifications of the tracking beam, and the specifications are sent to the beam control device 5.

Embodiment 3 FIG. FIG. 3 shows a radar control apparatus according to a third embodiment of the present invention. In FIG. 3, 6 is a tracking control device, 7 is a tracking synchronization processing device,
8 is a target range classification device, and 14 is a short distance target detection device.

The principle of operation of the radar control device configured as described above will be described with reference to FIG. The tracking control device 6 creates tracking data for each target, and uses this data as a target range classification device 8.
Enter The target range classification device 8 classifies each tracking target into a long-range target exceeding the maximum detection distance or a short-range target less than the maximum detection distance. The short-distance target detection device 14 holds a value such that all targets within the maximum detection distance can be tracked as the TOT upper limit value for the short-distance target, and adds the data of this TOT upper limit value to the tracking parameters of the short-distance target. The information that tracking is not performed is added to the tracking specifications of all long-distance targets. Further, the tracking specification is output to the tracking synchronization processing device 7. The tracking synchronization processing device 7 receives the tracking data of each target to which the TOT data has been added,
RF synchronization processing is performed to determine the specifications of the tracking beam, and the specifications are sent to the beam control device 5. At this time, the tracking target to which the information that tracking is not performed is added is not processed.

Embodiment 4 FIG. FIG. 4 shows a radar control apparatus according to a fourth embodiment of the present invention. In FIG. 4, 6 is a tracking control device, 7 is a tracking synchronization processing device,
8 is a target range classification device, 15 is a short distance target information setting device, and 16 is a long distance target information setting device.

The operation principle of the radar control device configured as described above will be described with reference to FIG. The tracking control device 6 creates tracking data for each target, and uses this data as a target range classification device 8.
Enter The target range classification device 8 classifies each tracking target into a long-range target exceeding the maximum detection distance or a short-range target less than the maximum detection distance. The short-distance target information setting device 15 adds, to the tracking specifications of the short-distance target, information that the PRF synchronization process is performed between the short-distance targets and information that the priority of the beam irradiation is higher than that of the beam for the long-distance target. Similarly, the long-distance target information setting device 16 adds, to the tracking specifications of the long-distance target, information that the PRF synchronization processing is performed between the long-distance targets and information that the beam irradiation priority is lower than the beam for the short-distance target. I do. When the short-range target and the long-range target coexist, the tracking synchronization processing device 7 inputs the tracking specification of each target to which the data of the TOT upper limit value is added,
PR between antenna surfaces between short-range targets and long-range targets
The data of the tracking beam is determined by performing the F synchronization processing, and the data of the tracking beam is sent to the beam controller 5 in the order of the short-range target and the long-range target. If only the short-range target exists, the short-range targets perform PRF synchronization processing between the antenna surfaces to determine the specification of the tracking beam, and transmit the specification of the tracking beam for the short-range target to the beam control device. If only a long-distance target exists, the PRF between antenna surfaces between the long-distance targets
A synchronization process is performed to determine the specification of the tracking beam, and the specification of the tracking beam for the long-distance target is sent to the beam control device 5.

[0035]

According to the present invention, when performing the PRF synchronization processing between the antenna surfaces, the TOT for the short-distance target is not unnecessarily increased, and as a result, the PR with the long-distance target is prevented.
It is possible to reduce the number of short-distance targets that cannot be tracked due to the F synchronization processing.

According to the present invention, when performing the PRF synchronization processing between the antenna surfaces, the TOT for the short-distance target is not unnecessarily increased, and as a result, the PRF for the long-distance target is prevented.
The number of short-distance targets that cannot be tracked due to the synchronization processing can be set to zero.

According to the present invention, when performing the PRF synchronization processing between the antenna surfaces, the TOT for the short-distance target is not unnecessarily increased, and as a result, the PRF for the long-distance target is prevented.
The number of short-distance targets that cannot be tracked due to the synchronization processing can be set to zero.

According to the present invention, when performing the PRF synchronization processing between the antenna surfaces, the TOT for the short-range target is not unnecessarily increased, and as a result, the PRF for the long-range target is prevented.
The number of short-distance targets that cannot be tracked due to the synchronization processing can be set to zero.

[Brief description of the drawings]

FIG. 1 is a block diagram of a radar control device according to a first embodiment of the present invention.

FIG. 2 is a block diagram of a radar control device according to a second embodiment of the present invention.

FIG. 3 is a block diagram of a radar control device according to a third embodiment of the present invention.

FIG. 4 is a block diagram of a radar control apparatus according to a fourth embodiment of the present invention.

FIG. 5 is a diagram illustrating each case of a target generation situation in a second embodiment of the radar control device according to the present invention.

FIG. 6 shows a PRF with a plurality of antenna planes according to the prior art.
FIG. 3 is a block diagram of an electronic scanning radar having a function of synchronizing transmission timing by a synchronization process.

FIG. 7 is a block diagram of a conventional radar control device.

FIG. 8 is a diagram illustrating a situation in which a problem occurs in a radar control device according to the related art.

[Explanation of symbols]

Reference Signs List 1 antenna, 2 signal processing control device, 3 target information processing device, 4 radar control device, 5 beam control device, 6
Tracking control device, 7 tracking synchronization processing device, 8 target range classification device, 9 short-range target TOT upper limit value setting device, 10
Long-distance target TOT upper limit value setting device, 11 antenna maximum TOT sum calculation device, 12 antenna long-distance target TOT upper limit calculation device, 13 long-distance target TOT upper limit calculation device, 14 short-distance target detection device, 15 short-distance Target information setting device, 16 Long distance target information setting device.

Claims (4)

[Claims] 1. The P of a beam irradiated on a plurality of antenna surfaces
In a radar control device of an electronic scanning radar having a function of synchronizing transmission timing by RF (pulse repetition period) synchronization processing, a tracking control device that creates tracking data for each tracking target, and a tracking created by the tracking control device A target range classifying device that classifies each tracking target into a short-range target and a long-range target based on specifications; and a tracking beam irradiation time (TO) for one target in the tracking specification of a target classified as a short-range target.
A short-distance target TOT upper limit setting device that outputs the upper limit of T) and outputs the TOT upper limit for the long-distance target to the tracking parameters of the target classified as the long-distance target from the TOT upper limit for the short-distance target A long-distance target TOT upper limit value setting device for adding and outputting a small value, and inputting tracking parameters output from the short-distance target TOT upper limit value setting device and the long-distance target TOT upper limit value setting device, and PR
A radar control device comprising a tracking synchronization processing device that performs F synchronization processing. 2. The P of a beam irradiated on a plurality of antenna surfaces.
In a radar control device of an electronic scanning radar having a function of synchronizing transmission timing by RF (pulse repetition period) synchronization processing, a tracking control device that creates tracking data for each tracking target, and a tracking created by the tracking control device A target range classifying device that classifies each tracking target into a short-range target and a long-range target based on specifications; and a tracking beam irradiation time (TO) for one target in the tracking specification of a target classified as a short-range target.
A short-range target TOT upper limit value setting device that outputs the upper limit value of T), a sum of a short-range target TOT of each antenna surface, a maximum value of a sum of a short-range target TOT of each antenna surface, An antenna unit maximum TOT sum calculation device for calculating a long-range target number existing on each antenna surface;
By dividing the maximum value of the sum of the TOT of the short-distance targets of each antenna surface by the number of long-distance targets existing on the surface, or the maximum time during which tracking can be performed within the beam management cycle and the short-distance target of each antenna surface Is divided by the number of long-distance targets existing on the surface, or by dividing the maximum value of the sum of TOTs of the short-distance targets of each antenna surface and the short-distance target existing on the surface. An antenna unit long-distance target TOT upper limit value calculating device for calculating an upper limit value of the TOT for a long-distance target by dividing the difference in TOT by the number of long-distance targets existing on the surface; The minimum value among the upper limit values of the TOT for the long-distance target for each antenna surface calculated by the calculation device is calculated as the long-distance target TOT of the entire radar system, and the long-distance target is calculated. A long-distance target TOT upper limit value calculating device that is added to and outputs a tracking specification of a target classified as a target; a tracking target output from the short-distance target TOT upper limit value setting device and a tracking target that is output from the long-distance target TOT upper limit calculating device A radar control device comprising: a tracking synchronization processing device that inputs a source and performs a PRF synchronization process between antenna surfaces. 3. The P of a beam irradiated on a plurality of antenna surfaces.
In a radar control device of an electronic scanning radar having a function of synchronizing transmission timing by RF (pulse repetition period) synchronization processing, a tracking control device that creates tracking data for each tracking target, and a tracking created by the tracking control device Creates target range classifiers that classify each tracking target into short-range targets and long-range targets based on specifications, and creates information that irradiates tracking beams only to targets classified as short-range targets and adds them to the tracking specifications And a tracking synchronization processing device for inputting tracking data output from the short-range target detection device and performing PRF synchronization processing between antenna surfaces. Control device. 4. The P of a beam irradiated on a plurality of antenna surfaces.
In a radar control device of an electronic scanning radar having a function of synchronizing transmission timing by RF (pulse repetition period) synchronization processing, a tracking control device that creates tracking data for each tracking target, and a tracking created by the tracking control device A target range classifier that classifies each tracking target into short-range targets and long-range targets based on the specifications, information indicating that the PRF synchronization processing with the short-range targets is performed for the short-range target tracking specifications, and a beam for the long-range targets A short-range target information setting device for adding and outputting information indicating that the priority of beam irradiation is higher than that of the short-range target. A long-distance target information setting device for adding and outputting information that the priority of beam irradiation is lower than that of a beam to the target; Radar control device, characterized in that it consists of a tracking synchronization apparatus enter the tracking specifications output from the constant unit performs PRF synchronization between the antenna surface.