JP2018132335A - Radar target detector and method for detecting radar target - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the tracking performances of a target by preventing the results of tracking of the same target from being displayed in pieces in a predetermined limited radar coverage by radar detection.SOLUTION: The radar target detector 5 includes: a radar picture acquisition part 51 for acquiring data on radar pictures in a plurality of frequency bands; a radar picture synthesis part 52 for synthesizing data on radar pictures in a plurality of frequency bands; and a radar target tracking part 53 for tracking the target of radar detection on the basis of the data on the radar pictures in the plurality of frequency bands synthesized by the radar picture synthesis part 52.SELECTED DRAWING: Figure 1

Description

  The present disclosure relates to a technique for improving target tracking performance in radar detection.

  Conventionally, radar detection in various frequency bands has been performed. For example, when detecting a target at a long distance from the radar site, radar detection is performed in the HF band, etc., and when detecting a target at a short distance from the radar site, radar detection is performed in the X band or the like. It has been broken. And in patent document 1, in addition to the radar detection in various frequency bands, when the clutter power is large and the received power is saturated, the target detection is performed by the infrared imaging device.

JP, 2006-075615, A

  Conventionally, radar detection in various frequency bands is performed independently. Here, in radar detection in each frequency band, the target detection distance is limited within a predetermined radar coverage, and a blind of the radar coverage is generated within the predetermined radar coverage. Therefore, in radar detection in each frequency band, even if the tracking result of the same target is displayed in a limited limited radar coverage, it is possible to improve target tracking performance. Can not.

  Therefore, in order to solve the above-described problem, the present disclosure is configured to prevent a radar detection from being displayed in a limited predetermined radar coverage even if the tracking result is the same target. The purpose is to improve the target tracking performance.

  In order to achieve the above object, data of radar images in a plurality of frequency bands are synthesized. That is, a target detection distance and a radar cover blind that cannot be detected by radar detection in a certain frequency band can be detected by radar detection in another frequency band. Based on the combined data of radar images in a plurality of frequency bands, the target that is the object of radar detection is tracked.

  Specifically, the present disclosure includes a radar image acquisition unit that acquires radar image data in a plurality of frequency bands, a radar image synthesis unit that combines the radar image data in the plurality of frequency bands, A radar target tracking device comprising: a radar target tracking unit that tracks a target that is a target of radar detection based on data of the radar video in the plurality of frequency bands synthesized by a radar video synthesis unit. It is.

  The present disclosure also includes a radar image acquisition step for acquiring radar image data in a plurality of frequency bands, a radar image combination step for combining the radar image data in the plurality of frequency bands, and the radar image synthesis. A radar target detection method comprising, in order, a radar target tracking step of tracking a target that is a target of radar detection based on the radar image data in the plurality of frequency bands synthesized in steps. .

  According to this configuration, even if tracking results of the same target are detected in radar detection, the tracking performance of the target is improved by preventing it from being displayed in a limited predetermined radar coverage. be able to.

  Further, according to the present disclosure, the radar image data in the plurality of frequency bands acquired by the radar image acquisition unit or synthesized by the radar image synthesis unit based on characteristics of radar detection in the plurality of frequency bands. A radar image selection unit that selects data of the radar image in a specific radar coverage of the entire radar coverage and in a specific frequency band of the plurality of frequency bands, This is a radar target detection device.

  According to this configuration, before the radar image acquisition unit acquires the radar image data in a plurality of frequency bands to be acquired by the radar image acquisition unit or to be combined by the radar image combination unit, the radar image combination unit It can be pre-selected before synthesis.

  Further, according to the present disclosure, among the targets that are targets of radar detection tracked by the radar target tracking unit, tracking is impossible in a certain frequency band of the plurality of frequency bands, and other targets of the plurality of frequency bands are not available. A radar further comprising: a small radar cross-section target detection unit that detects a target that can be tracked in a frequency band as a target having a small radar cross-section in the certain frequency band of the plurality of frequency bands. It is a target detection device.

  Even if the radar cross section is small, the radar cross section in a certain frequency band is only small, and the radar cross section in other frequency bands is never small. Therefore, even if the radar transmission power in the certain frequency band is not increased, if the radar transmission power in the other frequency band is set to a normal level, a target having a small radar cross-sectional area in the certain frequency band is detected. be able to.

  Further, the present disclosure provides a small radar cross section target detection unit that outputs a warning that a target having a small radar cross section in the certain frequency band among the plurality of frequency bands is detected. The radar target detection apparatus further includes a unit.

  Even if the radar cross section is small, the radar cross section in a certain frequency band is only small, and the radar cross section in other frequency bands is never small. Therefore, even if the radar transmission power in the certain frequency band is not increased, if the radar transmission power in the other frequency band is set to a normal level, a target having a small radar cross-sectional area in the certain frequency band is warned. be able to.

  As described above, in the radar detection, even if the tracking result of the same target is not displayed in a limited predetermined radar coverage, the present disclosure improves the tracking performance of the target. Can be improved.

It is a figure which shows the structure of the radar target detection system of this indication. It is a figure which shows the procedure of the radar target detection processing method of this indication. It is a figure which shows the process of the radar image | video synthetic | combination part of this indication, and a radar target tracking part. It is a figure which shows the process of the radar image | video selection part of this indication. It is a figure which shows the process of the small radar cross-sectional area target detection part of this indication.

  Embodiments of the present disclosure will be described with reference to the accompanying drawings. The embodiments described below are examples of the present disclosure, and the present disclosure is not limited to the following embodiments.

  The configuration of the radar target detection system of the present disclosure is shown in FIG. The procedure of the radar target detection processing method of the present disclosure is shown in FIG. The radar target detection system R includes an HF band radar device 1, an S band radar device 2, a C band radar device 3, an X band radar device 4, a radar target detection device 5, and a radar image display device 6. The radar target detection device 5 includes a radar image acquisition unit 51, a radar image synthesis unit 52, a radar target tracking unit 53, a radar image selection unit 54, a small radar cross section target detection unit 55, and a small radar cross section target warning unit 56. Is done.

  The HF band radar device 1, the S band radar device 2, the C band radar device 3 and the X band radar device 4 can detect the radar in the HF band, the radar detection in the S band, the radar detection in the C band, and the X band. Radar detection is performed independently. The radar image display device 6 visualizes and displays radar image data obtained and processed by the radar target detection device 5.

  The radar image acquisition unit 51 acquires radar image data in a plurality of frequency bands (step S2). The radar image synthesis unit 52 synthesizes radar image data in a plurality of frequency bands (step S3). The radar target tracking unit 53 tracks a target as a radar detection target based on radar image data in a plurality of frequency bands synthesized by the radar image synthesizing unit 52 (step S6). Step S1 will be described later with reference to FIG. Steps S4 and S5 will be described later with reference to FIG. The processing of the radar image synthesizing unit and the radar target tracking unit of the present disclosure is shown in FIG.

  The radar coverages C1, C2, C3, C4, C5, and C6 are arranged one-dimensionally in this order in FIG. 3, but are actually arranged two-dimensionally or three-dimensionally in this order. ing. The closer to the radar coverage C1, the farther away from the HF band radar device 1, the S band radar device 2, the C band radar device 3, and the X band radar device 4, and the closer to the radar coverage C6, the HF band radar device 1, S band. It approaches the radar device 2, the C-band radar device 3, and the X-band radar device 4.

  The radar image acquisition unit 51 acquires radar data DHF in the HF band in the radar coverage areas C1 and C2, and acquires radar data DS in the S band in the radar coverage areas C2, C3, and C5. In C3, C4, and C6, radar data DC in the C band is acquired, and in the radar covered areas C5 and C6, radar data DX in the X band is acquired (step S2).

  Thus, in radar detection in each frequency band, the target detection distance is limited within a predetermined radar coverage, and the blind of the radar coverage is generated within the predetermined radar coverage. In FIG. 3, in the S band, a blind occurs in the radar coverage C4, and in the C band, a blind occurs in the radar coverage C5. Therefore, with only the processing of the radar image acquisition unit 51, even if the tracking result of the same target is displayed in a limited predetermined radar coverage, it is possible to improve target tracking performance. Can not. In FIG. 3, in the S band, the tracking results of the same target are displayed as being cut off in the radar coverages C2 and C3 and the radar coverage C5. In the C band, the tracking results of the same target are displayed in the radar coverages C3 and C4 The area C6 is displayed as being cut off.

  The radar image synthesizing unit 52 synthesizes radar data DHF, DS, DC, and DX in the HF band, S band, C band, and X band in the radar coverage areas C1, C2, C3, C4, C5, and C6 (steps). S3). Radar data DHF and DS in the HF and S bands are superimposed in the radar coverage C2, and radar data DS and DC in the S and C bands are superimposed in the radar coverage C3. In the radar coverage C5, Radar data DS and DX in the S band and X band are superimposed, and radar data DC and DX in the C band and X band are superimposed in the radar coverage C6.

  As described above, the detection distance of the target and the blind of the radar coverage, which cannot be detected by radar detection in a certain frequency band, can be detected by radar detection in another frequency band. In FIG. 3, blinds in the S band can be detected in the C band, and blinds in the C band can be detected in the S band and the X band. Therefore, the tracking performance of the target is improved by the radar image synthesizing unit 52, so that even if the tracking result of the same target is not displayed in a predetermined limited radar coverage, the target tracking performance is improved. Can be made. In FIG. 3, in the combined result of the radar data DS, DC, and DX in the S band, the C band, and the X band, the tracking result of the same target is not displayed in the radar coverages C2, C3, C4, C5, and C6.

  When the same target can be tracked in two or more frequency bands in a certain radar coverage area (YES in step S4), the radar image synthesis unit 52 performs the radar image data in the radar coverage area and those frequency bands. Of these, only radar image data in the frequency band with the highest tracking performance is selected (step S5). In FIG. 3, the radar image synthesis unit 52 selects only the radar data DS in the S band with high tracking performance from the radar data DHF and DS in the HF band and S band in the radar coverage C2, In the area C3, only the radar data DC in the C band with high tracking performance is selected from the radar data DS and DC in the S band and C band, and the radar data in the S band and X band is selected in the radar coverage C5. Only the radar data DX in the X band with high tracking performance is selected from DS and DX, and the radar data DC and DX in the C band and X band in the X band with high tracking performance is selected in the radar coverage C6. Only radar data DX is selected.

  When the same target can be tracked in only one frequency band in a radar coverage area (NO in step S4), the radar image synthesis unit 52 maintains radar image data in that radar coverage area and that frequency band. To do. In FIG. 3, the radar image synthesizing unit 52 maintains the radar data DHF in the only trackable HF band in the radar coverage C1, and the radar data in the only trackable C band in the radar coverage C4. Maintain DC.

  The radar target tracking unit 53 is based on the result of combining radar data DHF, DS, DC, and DX in the HF band, S band, C band, and X band in the radar coverage areas C1, C2, C3, C4, C5, and C6. Thus, radar data DT of the same target in a wide range extending from a long distance to a short distance in the radar covered areas C1, C2, C3, C4, C5, and C6 is generated (step S6).

  The radar image selection unit 54, as radar image data in a plurality of frequency bands acquired by the radar image acquisition unit 51 or synthesized by the radar image synthesis unit 52, based on characteristics of radar detection in a plurality of frequency bands. Data of a radar image in a specific radar coverage of the entire radar coverage and a specific frequency band of a plurality of frequency bands is selected (step S1). As characteristics of radar detection in a plurality of frequency bands, there are distance characteristics, direction characteristics, resolution characteristics, noise characteristics, and the like of radar detection in a plurality of frequency bands. The processing of the radar image selection unit of the present disclosure is shown in FIG.

  First, in the case of the upper left column of FIG. 4, the longer the radar detection wavelength, the longer the target detection distance. Therefore, the radar image selection unit 54 selects the following radar image data as radar image data in a plurality of frequency bands acquired by the radar image acquisition unit 51 or synthesized by the radar image synthesis unit 52. Good: In the farthest radar coverage CHF, the radar data DHF in the HF band is selected, and in the longest radar coverage CS, the radar data DS in the S band is selected, and the radar coverage in the shortest distance is selected. In CX, radar data DX in the X band is selected, and then in radar coverage area CC in the short distance, radar data DC in the C band is selected. Here, the radar coverage in the microwave band may be expanded when the radar horizon is extended to a long distance (radio duct) by reversing the distribution of the refractive index of the atmosphere according to weather conditions. .

  Next, in the case of the upper right column of FIG. 4, in the anti-air target detection, radar detection is usually performed in the HF band and S band, but a blind region may occur in the HF band and S band. In target detection, radar detection is usually performed in the C-band and X-band, but blind regions may occur in the C-band and X-band. Therefore, the radar image selection unit 54 selects the following radar image data as radar image data in a plurality of frequency bands acquired by the radar image acquisition unit 51 or synthesized by the radar image synthesis unit 52. Good: In anti-air target detection, radar data DHF and DS in the HF band and S band are selected in the normal area, and radar data DC and DX in the C band and X band are selected in the blind area. In the water target detection, the radar data DC and DX in the C band and X band are selected in the normal area, and the radar data DHF and DS in the HF band and S band are selected in the blind area. Here, it may be considered that the height pattern of the blind region is generated by reflection of radar electromagnetic waves on the sea surface.

  Next, as shown in the lower left column of FIG. 4, the shorter the radar detection wavelength, the higher the target detection resolution. Therefore, the radar image selection unit 54 selects the following radar image data as radar image data in a plurality of frequency bands acquired by the radar image acquisition unit 51 or synthesized by the radar image synthesis unit 52. Good: Radar data DX in the X band is selected in the shortest radar coverage CX, then radar data DC in the C band is selected in the shortest radar coverage CC, and the farthest radar coverage In CHF, the radar data DHF in the HF band is selected, and in the long-range radar coverage CS, the radar data DS in the S band is selected. Here, the radar coverage in the microwave band may be expanded when the radar horizon is extended to a long distance (radio duct) by reversing the distribution of the refractive index of the atmosphere according to weather conditions. .

  Next, in the case of the lower right column in FIG. 4, in the airborne target detection, the rain clutter decreases in the HF band, but the rain clutter increases in the S band, and the sea surface clutter decreases in the C band in the water target detection. However, sea level clutter increases in the X band. Therefore, the radar image selection unit 54 selects the following radar image data as radar image data in a plurality of frequency bands acquired by the radar image acquisition unit 51 or synthesized by the radar image synthesis unit 52. Good: When there is a lot of rainfall in the anti-air target detection, the radar data DHF in the HF band is selected in a wide / narrow range, and the radar data DS in the S band is selected in a narrow / wide range. When the wave height is high or low in the water target detection, the radar data DC in the C band is selected in a wide / narrow range, and the radar data DX in the X band is selected in a narrow / wide range.

  Then, the radar image data selected by the radar image selection unit 54 is acquired by the radar image acquisition unit 51 or synthesized by the radar image synthesis unit 52 (see FIG. 3).

  Thus, before the radar image acquisition unit 51 acquires radar image data in a plurality of frequency bands to be acquired by the radar image acquisition unit 51 or to be combined by the radar image synthesis unit 52, or the radar image synthesis unit. 52 can be pre-selected before combining.

  The small radar cross-sectional area target detection unit 55 is not capable of tracking in a certain frequency band among a plurality of frequency bands among the targets that are the targets of radar detection tracked by the radar target tracking unit 53. A target that can be tracked in another frequency band is detected as a target having a small radar cross-sectional area in the certain frequency band among a plurality of frequency bands (YES in step S7, step S8). The small radar cross section target warning unit 56 outputs a warning that the small radar cross section target detection unit 55 has detected a target having a small radar cross section in the certain frequency band among the plurality of frequency bands (step S9). ). The processing of the small radar cross-sectional area target detection unit of the present disclosure is shown in FIG.

  First, in the upper case of FIG. 5, the radar image synthesizing unit 52 employs radar data DHF in the HF band in the radar coverage C1, and the radar in the HF band and S band in the radar coverage C2. Data DHF and DS are superimposed, radar data DS and DC in the S band and C band are superimposed in the radar coverage C3, and radar data DC in the C band is adopted in the radar coverage C4. In the radar coverage C5, the radar data DS in the S band is adopted, and in the radar coverage C6, the radar data DC in the C band is adopted.

  Therefore, the small radar cross-sectional area target detection unit 55 determines that there is a target that cannot be tracked in the X band and can be tracked in the HF band, the S band, and the C band (YES in step S7). Then, the small radar cross-section target detection unit 55 detects the target as a target having a small radar cross-section in the X band (step S8). Further, the small radar cross section target warning unit 56 warns the target as a target having a small radar cross section in the X band (step S9).

  Next, as in the case of the lower stage of FIG. 5, as in the case of the middle stage of FIG. 3 (before superimposition removal), the radar image synthesis unit 52 employs the radar data DHF in the HF band in the radar coverage C1. In the radar covered area C2, the radar data DHF and DS in the HF band and the S band are superimposed, and in the radar covered area C3, the radar data DS and DC in the S band and the C band are superimposed. Radar data DC in the C band is adopted in the radar coverage C4, and radar data DS and DX in the S and X bands are superimposed in the radar coverage C5. The radar data DC and DX in the band and the X band are superimposed.

  Therefore, the small radar cross-sectional area target detection unit 55 determines that there is a target that can be tracked in the X band and can be tracked in the HF band, the S band, and the C band (NO in step S7). Then, the small radar cross section target detection unit 55 detects the target as a target having a large radar cross section in the X band (step not shown in FIG. 2). Further, the small radar cross section target warning unit 56 does not need to warn the target as a target having a large radar cross section in the X band.

  Thus, even if the radar cross section is a small target, the radar cross section is only small in a certain frequency band (for example, X band), and other frequency bands (for example, HF band, S band, and C band). ) Radar cross section is not small. Therefore, even if the radar transmission power in the certain frequency band is not increased, if the radar transmission power in the other frequency band is set to a normal level, a target having a small radar cross-sectional area in the certain frequency band can be detected / Can be warned.

  The radar target detection apparatus and the radar target detection method according to the present disclosure are configured so that, even in the radar detection, even if the tracking result of the same target is not displayed in a predetermined limited radar coverage area. The tracking performance of the target can be improved.

R: Radar target detection system 1: HF band radar device 2: S band radar device 3: C band radar device 4: X band radar device 5: Radar target detection device 6: Radar image display device 51: Radar image acquisition unit 52: Radar image synthesis unit 53: Radar target tracking unit 54: Radar image selection unit 55: Small radar cross section target detection unit 56: Small radar cross section target warning unit C1, C2, C3, C4, C5, C6, CHF, CS, CC, CX: Radar coverage DHF, DS, DC, DX, DT: Radar data

Claims (5)

A radar image acquisition unit for acquiring radar image data in a plurality of frequency bands;
A radar image synthesizing unit that synthesizes data of the radar image in the plurality of frequency bands;
A radar target tracking unit that tracks a target that is a target of radar detection based on data of the radar video in the plurality of frequency bands synthesized by the radar video synthesis unit;
A radar target detection apparatus comprising: Based on the radar detection characteristics in the plurality of frequency bands, the radar image data acquired by the radar image acquisition unit or synthesized by the radar image synthesis unit is data of the radar image in the plurality of frequency bands. A radar image selection unit that selects data of the radar image in a specific radar band in the whole and in a specific frequency band of the plurality of frequency bands;
The radar target detection apparatus according to claim 1, further comprising: Among the targets that are the targets of radar detection tracked by the radar target tracking unit, tracking is impossible in a certain frequency band of the plurality of frequency bands, and tracking is possible in other frequency bands of the plurality of frequency bands. A small radar cross section target detection unit that detects a target as a target having a small radar cross section in the certain frequency band of the plurality of frequency bands;
The radar target detection apparatus according to claim 1, further comprising: A small radar cross-sectional area target warning unit that outputs a warning to the effect that the small radar cross-sectional area target detection unit has detected a target having a small radar cross-sectional area in the certain frequency band of the plurality of frequency bands;
The radar target detection apparatus according to claim 3, further comprising: A radar image acquisition step for acquiring radar image data in a plurality of frequency bands;
A radar image synthesizing step of synthesizing data of the radar image in the plurality of frequency bands;
A radar target tracking step for tracking a target that is a target of radar detection based on the data of the radar video in the plurality of frequency bands synthesized in the radar video synthesis step;
In order, a radar target detection method.

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