Clutter suppression method for high repetition frequency sum-difference antenna radar seeker
A radar seeker and clutter suppression technology, which is applied in radio wave measurement systems, complex mathematical operations, instruments, etc., can solve the problems of inability to suppress radar clutter, reduced clutter suppression performance, and blurred distance, so as to improve detection The effect of performance, less spatial freedom, and high real-time performance
Pending Publication Date: 2022-05-03
XIDIAN UNIV
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Problems solved by technology
Although this method can better filter out the clutter of airborne non-frontal array radar with ambiguous distances, the clutter suppression performance of this method will be reduced when the degree of freedom in the pitch dimension is insufficient or the aperture in the pitch dimension is limited.
In addition, this method is only suitable for phased arrays, and cannot suppress the radar clutter of sum-difference antenna systems
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[0040] The embodiments and effects of the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0041] refer to figure 1 , the implementation steps of this example are as follows:
[0042] Step 1, obtain echo data.
[0043] Using high pulse repetition frequency (HPRF) and difference system antenna, according to the down-conversion and matched filtering operations on the echo reflected from the target, the two-dimensional echo data matrix X with high range ambiguity of the sum and difference antenna system radar is obtained:
[0044] X=[X(1),X(2),…,X(l),…X(L)]
[0045] Among them, X(l) is the space-time snapshot data matrix of the l-th range gate, l=1,2,...,L, and L is the number of samples in the distance dimension. Due to the high duty ratio of the HPRF radar system, the return The wave is a quasi-continuous wave signal, and L is usually small, even 1;
[0046] The specific form of X(l) is:
[0047]
[0048] where...
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The invention discloses a clutter suppression method for a high pulse repetition frequency (HPRF) sum-difference antenna radar seeker, and mainly solves the problems that in the prior art, suppression of fuzzy clutters of a high PRF radar cannot be effectively achieved, and the detection performance of a low-speed target is poor. According to the implementation scheme, a two-dimensional echo data matrix of sum-difference antenna system radar high-weight range ambiguity is obtained; performing sliding window rearrangement on difference channel data to obtain a training sample; designing an adaptive weight vector according to a minimum variance undistorted response criterion; expanding the adaptive weight vector to construct an expanded vector; acting the expansion vector on the adaptive weight vector to obtain a final adaptive weight vector; and acting the final adaptive weight vector on the channel echo data to obtain an output signal after clutter suppression. According to the method, HPRF radar fuzzy clutter suppression can be effectively realized, the output signal-clutter-noise ratio of a target is improved, the detection performance of a low-speed target is improved, and the method can be used for suppression of ground and sea clutter with multiple range ambiguity.
Description
technical field [0001] The invention belongs to the technical field of radar signal processing, and in particular relates to a clutter suppressing method, which can be used for suppressing ground-sea clutter with multiple distances and ambiguous distances when detecting an ultra-low-altitude moving target. Background technique [0002] The performance of radar moving target detection and parameter estimation is very important to improve the long-range precision strike capability of the seeker. The existing seeker radar usually works at high pulse repetition frequency (HPRF). When the seeker radar is in the down-looking working state, There is a serious Doppler spread in the ground-sea clutter, and the slow target signal will be submerged in the clutter background. With the increase of PRF, the maximum unambiguous distance becomes smaller, the multiplicity of ambiguities increases, and the distance The ambiguity problem becomes more serious, and the target competes with multi...
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IPC IPC(8): G01S7/02G01S7/292G01S7/41G06F17/16G06F17/18
CPCG01S7/02G01S7/292G01S7/41G06F17/16G06F17/18
Inventor 许京伟廖桂生牛亚丽刘广君朱圣棋贺雄鹏阮晓峰
Owner XIDIAN UNIV