时频分析联合带通滤波抑制间歇采样转发干扰

doi:10.19665/j.issn1001-2400.2021.02.018

Abstract

Abstract:

Interrupted sampling repeater jamming is a new type of coherent jamming that generates a single or multiple false target groups,which cannot be effectively suppressed using conventional signal processing methods.To solve this problem,the received signals of several pulse repetition cycles are first accumulated in the time-frequency domain to enhance the time-frequency information on the signals.Then,the distribution of jamming signal is extracted accurately on the time-frequency surface based on the image processing algorithm,and the target echo is roughly reconstructed according to the time-frequency domain filtering method.Finally,based on the reconstructed time-domain signal,a band-pass filter is constructed to suppress the interference and noise.Simulation results indicate that compared with other methods,this scheme can effectively suppress various types of interrupted sampling repeater jamming in a low signal-to-noise ratio and multi-target environment with robustness and accuracy.

Key words: interrupted sampling repeater jamming, time-frequency analysis, image processing, band-pass filtering, interference suppression

CLC Number:

TN974

SUN Zhengyang,DONG Mei,CHEN Baixiao. Interrupted sampling repeater jamming suppression based on time-frequency analysis and band-pass filtering[J].Journal of Xidian University, 2021, 48(2): 139-146.

Figures/Tables 8

References 14

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参数	取值	参数	取值
信号时宽/μs	20	干扰采样时间/μs	2
信号带宽/MHz	40	干扰采样周期/μs	8
信号载频/GHz	6	干扰调制频移/MHz	6
采样频率/MHz	50	目标1相对参考点距离/m	600
脉冲个数	16	目标2相对参考点距离/m	1 200

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Interrupted sampling repeater jamming suppression based on time-frequency analysis and band-pass filtering

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