CN109031232B - Adaptive masking coefficient height line clutter suppression method - Google Patents
Adaptive masking coefficient height line clutter suppression method Download PDFInfo
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- CN109031232B CN109031232B CN201810897281.3A CN201810897281A CN109031232B CN 109031232 B CN109031232 B CN 109031232B CN 201810897281 A CN201810897281 A CN 201810897281A CN 109031232 B CN109031232 B CN 109031232B
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- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/41—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00 using analysis of echo signal for target characterisation; Target signature; Target cross-section
- G01S7/414—Discriminating targets with respect to background clutter
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Abstract
The invention relates to a self-adaptive hiding coefficient height line clutter suppression method, which comprises the following steps: s1: acquiring antenna parameters A corresponding to the antenna when the side lobe gain of the main antenna is higher than the gain of the protection antenna in an actually measured antenna azimuth diagram; s2: acquiring an antenna parameter C corresponding to the current height line clutter incident angle according to parameter information transmitted by the aircraft inertial navigation; s3: and comparing the antenna parameter C value corresponding to the current height line clutter incident angle with the actually-measured antenna parameter A value, if the former falls into the latter range, using the new shading coefficient, otherwise, keeping the shading coefficient unchanged. The self-adaptive masking coefficient height line clutter suppression method can suppress the influence of height line clutter on target detection to the maximum extent, reduce the false alarm rate of the radar and improve the detection performance of the radar.
Description
Technical Field
The invention belongs to the technical field of radar signal processing, and particularly relates to a self-adaptive hiding coefficient height line clutter suppression method.
Background
The detection of a target signal from a strong clutter environment is a basic function of a modern airborne pulse Doppler radar (PD radar for short), and in order to realize the basic function, the radar generally emits waveforms in various forms. The Pulse Repetition Frequency of the waveform may be classified into a High Pulse Repetition Frequency (HPRF), a Medium Pulse Repetition Frequency (MPRF), and a Low Pulse Repetition Frequency (LPRF). The high-repetition waveform is mainly used for front hemisphere echo signals, at the moment, the relative speed of a target and a carrier is high, the Doppler frequency of the echo is high, and the speed of high-repetition frequency emission signals is not fuzzy; the low-gravity waveform is mainly used for a long-distance target, the echo Doppler frequency is fuzzy at the moment, but the distance detection is not fuzzy; the detection of the medium heavy signal waveform is typically ambiguous in both speed and distance. But the ambiguity of speed and distance can be resolved by changing the Period (PRI) of the intermediate Repetition frequency signal.
MPRF in the three types of detection waveforms becomes the preferred waveform of the modern airborne PD radar because of having all-round detection, good distance measurement and speed measurement performances. However, when the medium repetition frequency waveform works, clutter to be countered by the radar is complex, and the clutter includes ground mainlobe echo, ground sidelobe echo and blurred ground clutter. PD radars generally eliminate the main lobe clutter by zeroing the main clutter frequency and setting a low-speed moving target detection guard area through on-board motion compensation, while side lobe clutter is generally solved by guard antenna shadowing.
The side lobe clutter has two effects on the radar performance: firstly, a radar detection false alarm is added, and clutter can be mistakenly detected as a target signal; secondly, the noise threshold of the distance-speed unit where the real target is located is improved, and the target detection probability is reduced; the secondary side lobe clutter is most obviously affected by height line clutter on the performance of the radar, the height line clutter is a ground side lobe echo received from the right below of the airborne radar, and the height line clutter can be detected out sometimes as a target due to a special incident angle, a relatively short incident distance and a large-range irradiation area, so that the performance of the radar is seriously affected. Therefore, the maximum inhibition of the influence of the altitude line clutter in the target detection is of great significance to the improvement of the performance of the airborne PD radar.
Disclosure of Invention
The invention aims to provide a method for suppressing the height line clutter of an adaptive masking coefficient, which is used for solving the problems.
In order to achieve the purpose, the invention adopts the technical scheme that: an adaptive concealment coefficient height line clutter suppression method, comprising:
s1: acquiring antenna parameters A corresponding to the antenna when the side lobe gain of the main antenna is higher than the gain of the protection antenna in an actually measured antenna azimuth diagram;
s2: acquiring an antenna parameter C corresponding to the current height line clutter incident angle according to parameter information transmitted by the aircraft inertial navigation;
s3: and comparing the antenna parameter C value corresponding to the current height line clutter incident angle with the actually-measured antenna parameter A value, if the former falls into the latter range, using the new shading coefficient, otherwise, keeping the shading coefficient unchanged.
Further, the antenna parameters include an antenna azimuth angle, a pitch angle, a beam pointing angle, and an operating frequency.
Further, the inertial navigation parameter information includes a climbing angle and a roll angle.
Further, in step S3, the machine body coordinate system of the climbing roll angle is further converted into an antenna coordinate system.
Further, in step S3, the current height line clutter incidence angle is based on the antenna coordinate system.
Further, the new concealment coefficient is larger than the original concealment coefficient.
The self-adaptive hiding coefficient height line clutter suppression method can suppress the influence of height line clutter on target detection to the maximum extent, and compared with the prior art, the method has the following advantages:
(1) Self-adaptive change of the side lobe hiding coefficient can remove height line clutter false alarm caused by inherent errors of the antenna;
(2) Relevant frequency points and beam pointing angles are collected when the radar leaves a factory, and the hiding coefficient is modified only by looking up a table when the radar works normally, so that complex operation is omitted, calculation resources are greatly saved, and efficiency is improved;
(3) The position of the height line clutter in the frequency spectrum is deducted when the detection is not needed, so that the detection missing of a real target near the height line clutter is avoided;
(4) The method can be applied to the airborne radar to suppress the clutter of the altitude line to the maximum extent in the flight process, reduce the false alarm rate of the radar and improve the detection performance of the radar.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
FIG. 1 is a flowchart illustrating a method for suppressing height line clutter with adaptive concealment coefficients according to the present invention.
FIG. 2 is a measured antenna pattern according to an embodiment of the present invention;
FIG. 3 is a three-dimensional spectrogram of the radar in actual flight corresponding to that of FIG. 2;
fig. 4 is a three-dimensional spectrum diagram after the change of the masking coefficient.
Detailed Description
In order to make the implementation objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be described in more detail below with reference to the accompanying drawings in the embodiments of the present invention.
A radar antenna is a device used in radar to radiate and receive electromagnetic waves and determine the detection direction thereof. In the actual use process, the radar antenna can change the performance of a directional diagram due to factors such as different wave beam centers, frequency points, processing errors and the like, and the actual side lobe gain of the main antenna is higher than that of the protection antenna under certain conditions. In order to minimize its effect, it is indirectly ensured that the side lobe echo is not targeted by changing the masking coefficient within the software. Since the most serious influence in the side lobe echo is caused by the altitude line, the masking method only changes the masking coefficient of the altitude line.
Referring to fig. 1, the adaptive concealment coefficient height line clutter suppression method of the present invention comprises the following steps:
storing the sidelobe angle of the main antenna actually measured when leaving the factory, the sidelobe gain of the main antenna being higher than the corresponding sidelobe angle of the protection antenna, the frequency point and the beam pointing azimuth pitch angle, putting the stored sidelobe angle and the frequency point and the beam pointing azimuth pitch angle into a set A, and recording the set A as a set A (f) 0 ，θ 0 ，φ 0 ，θ 1 ，φ 1 ) Wherein f is 0 Is the frequency point of operation, theta 0 Is the beam pointing azimuth angle, phi 0 Is the beam pointing pitch angle, theta 1 The side lobe gain of the main channel antenna exceeds the azimuth angle phi of the protection channel 1 Is the pitch angle.
When the radar works normally, the information of the climbing angle and the roll angle of the carrier transmitted by the inertial navigation is received and passes through the machine bodyConverting the coordinate system into an antenna system, calculating the azimuth angle and the pitch angle of the antenna coordinate system corresponding to the incidence angle of the altitude line clutter and putting the azimuth angle and the pitch angle into a set C (f) 1 ，θ 4 ，φ 4 ，θ 3 ，φ 3 ) Wherein f is 1 Is the frequency point of operation, theta 4 Is the beam pointing azimuth angle, phi 4 Is the beam pointing pitch angle, theta 3 Is the azimuth angle of the elevation line clutter in the antenna coordinate system, phi 3 Is the pitch angle.
If the value of C is in the set A, the radar uses a new hiding coefficient value which is inversely proportional to the difference between the main channel power value and the protection channel power, so that the power of the hiding coefficient multiplied by the main antenna return is smaller than that of the protection antenna, and the hiding is successful.
In general, the value of the hidden coefficients is increased, that is, the new hidden coefficients are larger than the original hidden coefficients.
If the value of C is not in the set A, the radar hiding coefficient is kept unchanged.
For a better understanding of the content of the invention, reference is made to fig. 2 to show the measured antenna pattern.
Fig. 2a shows that when the beam azimuth pointing angle is 0 degree and the operating frequency is 8GHz, the solid line is the actual measurement directional diagram of the radar main antenna, and the dotted line is the actual measurement directional diagram of the protection antenna, it can be seen that all the side lobe gains in all the main antenna directional diagrams are lower than the gain of the protection antenna, and the set a is empty;
FIG. 2b shows that when the beam elevation pointing angle is-15 degrees and the operating frequency is 9.7GHz, the solid line is the actual measurement directional diagram of the radar main antenna, the dotted line is the actual measurement directional diagram of the protection antenna, and the gain of the main antenna is higher than that of the protection antenna near-70 degrees, at this time, the set A (9.7 GHZ, theta) 0 ，-15°，θ 1 ，-100°～-65°)；
FIG. 2c shows a beam elevation pointing angle of-30 degrees, and a working frequency of 9.7GHz, where the solid line is the actual measurement directional diagram of the main antenna of the radar, the dotted line is the actual measurement directional diagram of the protection antenna, and the gain of the main antenna is higher than that of the protection antenna near-50 degrees, at this time, the set A (9.7 GHz, theta) 0 ，-30，θ 1 ，-48°～-41°)
Fig. 2d shows that when the beam elevation pointing angle is 0 degree and the operating frequency is 9.7GHz, the solid line is the actual measurement directional diagram of the main antenna of the radar, the dotted line is the actual measurement directional diagram of the protection antenna, it can be seen that all the side lobe gains in all the main antenna directional diagrams are lower than the gain of the protection antenna, and the set a is empty.
Referring to the empty space echo spectrogram corresponding to fig. 2 shown in fig. 3, since the main clutter (echoes emitted to the ground by the mainlobe) occupies all the range gates and the height line clutter is located near the frequency gate zero, it can be seen that in some cases, the height line clutter may be regarded as a real target, causing a false alarm.
In fig. 2a and 2d corresponding to fig. 3a and 3d, the shading coefficient is set reasonably, and the protection antenna has a protection effect, so that the height line clutter is not detected and a false alarm is not caused.
In fig. 2b and 2c corresponding to fig. 3b and 3c, the secret shadow coefficient is not set reasonably, and the protection antenna does not play a role of protection, so the height line clutter is detected, which causes a false alarm. Taking the empty echo spectrogram in fig. 3b as an example, the pitch angle of the antenna corresponding to the incidence angle of the current altitude line clutter obtained through the aircraft inertial navigation is-90 ° -80 °, and at this time, the pitch angle falls into the set a, so that the original shadow coefficient 1 is increased to 1.1. After the above process, the height line clutter is filtered in the subsequent detection, as shown in fig. 4.
Through the steps, the method can suppress the height line clutter to the maximum extent, reduce the false alarm rate of the aircraft in the actual test flight process and improve the detection performance of the radar.
The self-adaptive hiding coefficient height line clutter suppression method can suppress the influence of height line clutter on target detection to the maximum extent, and compared with the prior art, the method has the following advantages:
(1) Self-adaptive change of the side lobe masking coefficient can remove height line clutter false alarm caused by inherent errors of the antenna;
(2) Relevant frequency points and beam pointing angles are collected when the radar leaves a factory, and the hiding coefficient is modified only by looking up a table when the radar works normally, so that complex operation is omitted, calculation resources are greatly saved, and efficiency is improved;
(3) The position of the height line clutter in the frequency spectrum is deducted when the detection is not needed, so that the detection missing of a real target near the height line clutter is avoided;
(4) The method can be applied to the airborne radar to suppress the clutter of the altitude line to the maximum extent in the flight process, reduce the false alarm rate of the radar and improve the detection performance of the radar.
The above description is only for the best mode of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (6)
1. A method for suppressing clutter on the height line of an adaptive concealment coefficient is characterized by comprising the following steps:
s1: acquiring antenna parameters A corresponding to the antenna when the side lobe gain of the main antenna is higher than the gain of the protection antenna in an actually measured antenna azimuth diagram;
s2: acquiring an antenna parameter C corresponding to the current height line clutter incident angle according to parameter information transmitted by the aircraft inertial navigation;
s3: and comparing the antenna parameter C value corresponding to the current height line clutter incident angle with the actually-measured antenna parameter A value, if the former falls into the latter range, using the new shading coefficient, otherwise, keeping the shading coefficient unchanged.
2. The adaptive suppression coefficient elevation line clutter suppression method of claim 1, wherein said antenna parameters comprise antenna azimuth, pitch, beam pointing angle, and operating frequency.
3. The adaptive subtraction coefficient height line clutter suppression method according to claim 1, wherein the parameter information of the inertial navigation comprises a climb angle and a roll angle.
4. The adaptive shading coefficient height line clutter suppression method according to claim 1, wherein the step S3 further comprises converting a body coordinate system of the climbing roll angle into an antenna coordinate system.
5. The method according to claim 3, wherein in step S3, the current clutter incidence angle is based on the antenna coordinate system.
6. The adaptive concealment coefficient high line clutter suppression method according to claim 1, wherein the new concealment coefficient is larger than the original concealment coefficient.
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| CN110261846A (en) * | 2019-05-17 | 2019-09-20 | 北京理工大学 | A kind of adaptive side-lobe blanking method of radar decoy AF panel |
| CN110161338B (en) * | 2019-05-30 | 2021-08-03 | 中国舰船研究设计中心 | Test method for electromagnetic compatibility time domain management between active and passive electronic systems |
| CN110618411B (en) * | 2019-10-23 | 2022-11-04 | 电子科技大学 | Airborne radar clutter real-time signal generation method |
| CN111044971B (en) * | 2019-12-23 | 2022-07-01 | 南京长峰航天电子科技有限公司 | Two-dimensional interferometer direction finding system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102854496A (en) * | 2012-09-19 | 2013-01-02 | 中国民航大学 | Airborne meteorological radar ground clutter suppression method based on double threshold control |
| CN103383448A (en) * | 2013-06-25 | 2013-11-06 | 西安电子科技大学 | Clutter suppression method suitable for high pulse repetition frequency (HPRF) waveform airborne radar |
| KR101339108B1 (en) * | 2012-07-24 | 2013-12-10 | 국방과학연구소 | Target detecting method of radar system |
| CN103901409A (en) * | 2014-03-14 | 2014-07-02 | 西安电子科技大学 | Airborne radar anti-forwarding type interference method based on adaptive beamforming |
| JP2017211238A (en) * | 2016-05-24 | 2017-11-30 | 株式会社東芝 | Rader system and radar signal processing method of the rader system |
-
2018
- 2018-08-08 CN CN201810897281.3A patent/CN109031232B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101339108B1 (en) * | 2012-07-24 | 2013-12-10 | 국방과학연구소 | Target detecting method of radar system |
| CN102854496A (en) * | 2012-09-19 | 2013-01-02 | 中国民航大学 | Airborne meteorological radar ground clutter suppression method based on double threshold control |
| CN103383448A (en) * | 2013-06-25 | 2013-11-06 | 西安电子科技大学 | Clutter suppression method suitable for high pulse repetition frequency (HPRF) waveform airborne radar |
| CN103901409A (en) * | 2014-03-14 | 2014-07-02 | 西安电子科技大学 | Airborne radar anti-forwarding type interference method based on adaptive beamforming |
| JP2017211238A (en) * | 2016-05-24 | 2017-11-30 | 株式会社東芝 | Rader system and radar signal processing method of the rader system |
Non-Patent Citations (4)
| Title |
|---|
| Mitigation of Sidelobe Clutter Discrete Using Sidelobe Blanking Technique in Airborne Radars;Narasimhan R S.et al;《2018 IEEE Aerospace Conference》;20180628;第1-12页 * |
| PD雷达导引头海杂波谱的建模与仿真;杨勇等;《雷达科学与技术》;20090630;第7卷(第3期);第169-173页 * |
| 机载脉冲多普勒雷达的自适应旁瓣对消实现方法;朱明等;《火力与指挥控制》;20160331;第41卷(第3期);第140-144页 * |
| 雷达副瓣匿影性能评估方法;高其嘉等;《现代雷达》;20180731;第40卷(第7期);第14-18页 * |
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