A Ground Clutter Spectrum Leakage Suppression Method Based on Doppler Channel Characteristics
A Doppler channel and Doppler filter technology, applied in the field of radar signal processing, can solve the problem of clutter spectrum leakage processing and subsequent data processing that is not conducive to the Doppler channel, and the instantaneous strong interference of clutter leakage that cannot be effectively suppressed , limited ground clutter spectrum suppression ability, etc., to achieve real-time computing and processing capabilities, multi-beam scalability, computing processing capabilities, and the effect of meeting real-time requirements
Active Publication Date: 2021-02-23
THE 724TH RES INST OF CHINA SHIPBUILDING IND
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These are all using the traditional moving target detection (MTD) method, which can effectively and unambiguously detect moving target signals within the Doppler channel range, but has limited ability to suppress ground clutter spectrum leakage
[0003] Traditional moving target detection (MTD) cannot effectively suppress ground clutter leakage and receiver strong instantaneous interference. During moving target detection (MTD) processing, due to the limited ability of the Doppler filter to suppress ground clutter with a certain spectral width, and For the instantaneous strong interference of the receiver, it will be misjudged as the target signal, which will affect the target detection at the back end and reduce the target detection probability
For the strong interference echo signal, after the pulse pressure, it becomes a false target signal modulated by the pulse pressure coefficient, which is not conducive to the ground clutter spectrum leakage processing and subsequent data processing of the Doppler channel characteristic division
For the ground clutter, since the ground clutter spectrum will have a certain broadening, the non-zero-speed filter will have a certain output, resulting in a large amount of clutter remaining and affecting the normal target detection. Therefore, the present invention proposes a method based on Doppler channel characteristics. The ground clutter spectrum leakage suppression method uses the strong interference elimination method and the ground clutter spectrum leakage suppression method based on Doppler channel characteristics to eliminate strong interference signals and residual ground clutter
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[0015] The flow chart of the ground clutter spectrum leakage suppression method based on Doppler channel characteristics in the present invention is as follows figure 1 As shown, assuming that the original radar IF echo data I and Q acquired after the CORDIC modulus operation is A1, the thresholds determined according to the background environment and receiver noise are M1 and M2, and the two distances on the left and right of the current discrimination distance unit are The modulus values of the unit are X1, X2, and the mean value of the sampled complex noise before pulse compression is I1, Q1, and the pulse repetition period of R slow time dimensions is recorded as: T1, T2, T3...TR. Assuming that the number of Doppler channels is R, the modulus value of the original echo after passing through a certain Doppler channel corresponding to the Doppler filter bank output on one of the distance units is recorded as Pk (k=1, 2,3...R), the original echo passes through a certain Dop...
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The invention relates to a ground clutter spectrum leakage suppression method based on Doppler channel characteristics. Firstly, the echo interference in the distance dimension is removed from the radar echo signal, and then pulse compression processing is performed. Finally, the noise is suppressed in the Doppler dimension. After the leveled pulse pressure data is detected and divided according to the Doppler channel, the distance unit is compared and judged in the Doppler domain except for the zeroth Doppler channel to suppress ground clutter spectrum leakage, eliminate strong Jamming signal. The method of the invention solves the problem of ground clutter spectrum leakage when detecting moving targets under strong interference conditions through preprocessing in the distance dimension and processing based on Doppler channel characteristics in the velocity dimension, and improves the probability of target detection.
Description
technical field [0001] The method of the invention belongs to the field of radar signal processing. Background technique [0002] With the rapid development of modern radar countermeasure technology, the traditional radar signal processing flow can no longer meet the requirements of refined signal processing and analysis. In the field of radar signal processing, it is more and more important to effectively eliminate strong interference signals, suppress ground clutter, and improve the effective detection probability of targets. Surface clutter is the echo signal from the Earth's surface and the ocean's surface. In the literature "FFT-MTD Filter Bank Optimal Design and Simulation" (Modern Defense Technology, 2011, Vol.39, No.2pp: 10-14), it is proposed to use "multiple bandpass filter banks to pulse the radar echo Doppler processing, and then detection on the output of the filter bank to find the target." In the document "Analysis of MTD Radar Anti-Jamming Performance" (Fi...
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IPC IPC(8): G01S13/50
CPCG01S13/505
Inventor张海龙张宁李赛辉
OwnerTHE 724TH RES INST OF CHINA SHIPBUILDING IND