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CI interference suppression method based on echo preprocessing and phase-coherent accumulation

A technology of coherent accumulation and interference suppression, applied to radio wave measurement systems, instruments, etc., can solve the problems of overlapping frequency domains and the difficulty of effective suppression by conventional signal processing methods, and achieve the effect of reducing computational complexity

Active Publication Date: 2021-02-12
NAVAL AERONAUTICAL UNIV
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Problems solved by technology

[0004] The purpose of the present invention is to propose a C&I interference suppression method based on echo preprocessing and coherent accumulation to solve the problem that self-defense C&I interference overlaps with the real echo in the time-frequency domain and conventional signal processing methods are difficult to effectively suppress

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  • CI interference suppression method based on echo preprocessing and phase-coherent accumulation
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  • CI interference suppression method based on echo preprocessing and phase-coherent accumulation

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[0045] The C&I interference suppression method based on echo preprocessing and coherent accumulation of the present invention will be described in detail below in conjunction with the accompanying drawings. Refer to attached figure 1 , the specific implementation steps are as follows:

[0046] (1) Do not process the fast time of the echo, do Fourier transform to estimate the echo time delay at the slow time, and set the distance window according to the echo time delay to intercept the disturbed echo segment;

[0047] (2) Using M kinds of different frequency modulation slope linear frequency modulation reference signals (M is the number of phase coherent accumulations), respectively carry out product modulation on the radar transmission signal and each pulse repetition cycle echo, and then use the modulated transmission signal as the matching signal, Pulse compression is performed on the echoes of each repeated period after modulation in turn to complete the echo preprocessing...

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Abstract

The invention belongs to the field of radar anti-interference, and provides a CI interference suppression method based on echo preprocessing and phase-coherent accumulation in order to solve the problems that self-defense C&I interference is overlapped with a real echo time-frequency domain, and a conventional signal processing means is difficult to suppress effectively. Echo time delay is estimated through a slow time FFT method, a distance window is set to intercept an interfered echo band, and on this basis, interference suppression is achieved by preprocessing echoes, changing fast time position distribution of false targets in different repetition periods and conducting slow time phase-coherent accumulation. According to the method, real echoes and interference signals do not needto be separated by utilizing a signal processing tool, the real target detection probability is greatly improved by integrally processing echoes of a coherent processing interval, and the number of false targets is obviously reduced. The overall calculation amount of the method is not large, and engineering implementation is possible.

Description

technical field [0001] The invention belongs to the field of radar anti-jamming, is applicable to linear frequency modulation pulse Doppler radar, and solves the problem that self-defense C&I interference overlaps with real echo in the time-frequency domain and conventional signal processing means are difficult to effectively suppress. Background technique [0002] Radar electronic countermeasures are an important part of information warfare. In order to effectively exert the effectiveness of radar in the context of strong interference, it is particularly important to study corresponding countermeasures for specific interference patterns. Chopping and Interleaving interference (C&I interference) and spectrum dispersion (SMSP) interference are two typical interference patterns for linear frequency modulation (LFM) pulse compression radar invented by Sparrow et al. Different from full-pulse copying and forwarding dense false target jamming, C&I jamming and SMSP jamming are gen...

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Application Information

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IPC IPC(8): G01S7/36G01S7/41
CPCG01S7/36G01S7/41Y02A90/10
Inventor 张翔宇王国宏张亮于洪波于亦文
Owner NAVAL AERONAUTICAL UNIV
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