Inter-pulse frequency agility radar clutter suppression method based on null broadening
A technology of zero notch broadening and clutter suppression, applied in radio wave measurement systems, instruments, etc., can solve problems such as inversion errors, matrix ill-conditioning, limited number of pulse accumulation, etc., and achieve strong robustness, engineering realization, and easy to achieve effect
Pending Publication Date: 2021-08-06
NO 20 RES INST OF CHINA ELECTRONICS TECH GRP
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This method uses the idea of orthogonal subspace projection to suppress the clutter components in the echo signal, but is limited by the number of accumulated pulses. When constructing a clutter suppression filter with zero traps in the velocity dimension and width, the matrix will be ill-conditioned. , the wrong inversion problem, causing the filter to fail to build
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[0047] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0048] The specific implementation is as follows:
[0049] Step 1: Receive the echo signal of each pulse in a CPI, and form the echo data matrix y after sampling and pulse compression;
[0050] Step 2: Take the middle value v of the clutter speed interval 0 =(v min +v max ) / 2, to construct the constraint matrix C of the single-point velocity in the full fine-distance segment:
[0051] C=a(0,v 0 ),a(ΔR,v 0 ),…,a(R x ΔR,v 0 ) (1)
[0052] In the formula, 0, R x -ΔR is the range of fine range, ΔR=c / 2B is the fine range resolution, c is the speed of light, it should be noted that the distance of pulse-agile frequency radar is ambiguous about the period of fine range, for the bandwidth of narrow-band pulse-agile frequency radar B=MΔf, Δf is the minimum frequency point interval of pulse-to-pulse agility, M is the number of independent frequency hoppin...
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The invention provides an inter-pulse frequency agility radar clutter suppression method based on null broadening, which comprises the following steps: firstly, calculating an intermediate value of a to-be-suppressed clutter speed interval, constructing a null constraint matrix of a single-point speed through a signal frequency hopping sequence and an orthogonal projection matrix, and then adopting a quadratic constraint null broadening method to expand a single-point speed null constraint matrix in a speed dimension, and finally, after clutter suppression is performed on a received signal, performing target parameter estimation through fine distance and speed two-dimensional search, so that coherent accumulation of inter-pulse frequency agility echoes is realized, and target detection is realized. According to the method, the problems that when an orthogonal projection matrix is directly adopted to construct a speed-dimension wide-null clutter suppression filter, due to the fact that the matrix is ill-conditioned, the filter is failed to construct are solved, the clutter suppression filter is calculated in real time through a high-performance digital signal processor, and parameters of the clutter suppression filter can be calculated and stored in advance according to a frequency hopping sequence; and the method is high in robustness, and engineering is easy to implement.
Description
technical field [0001] The invention relates to the field of radar detection and signal processing, and can be used for the suppression of ground clutter by pulse-to-pulse frequency-agile system radars. The invention proposes a zero The clutter suppression method of trap-broadening phase modulation. Background technique [0002] With the increasingly complex battlefield environment and the rapid development of electronic warfare, forward electronic jamming seriously threatens the radar's battlefield survival and tactical effectiveness. In order to change this situation, the pulse-to-pulse frequency-agile radar system has begun to be paid attention to. According to the pre-designed pseudo-random frequency hopping sequence, the transmission frequency can be quickly changed between pulses, which can effectively deceive the work of the jammer and achieve the purpose of not being easily jammed. [0003] The biggest feature of pulse-to-pulse frequency-agile radar is that the tran...
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IPC IPC(8): G01S7/02G01S7/36G01S7/41
CPCG01S7/023G01S7/36G01S7/414G01S7/418G01S7/415
Inventor 赵继超李英军姜婕高博苏军海关超
Owner NO 20 RES INST OF CHINA ELECTRONICS TECH GRP