基于STFrFT的间歇采样转发干扰抑制

doi:10.12305/j.issn.1001-506X.2024.10.09

Abstract

Abstract:

Jammers can rapidly slice and forward radar pulse to form interrupted-sampling repeater jamming. If it enters from the main lobe of radar, it will pose a serious threat to radar target detection. Starting from waveform design and time-frequency analysis, a main lobe interrupted-sampling repeater jamming suppression method is proposed based on short-time fractional Fourier transform (STFrFT). Firstly, an intra-pulse frequency agility signal is harnessed to improve the distinguishability between jamming and target signal.Moreover, the STFrFT is applied to time-frequency analysis, which significantly improves the time-frequency analysis accuracy compared with traditional short-time Fourier transform methods and removes the restrictions on signal parameters compared with fractional Fourier transform methods. Finally, through eliminating jamming by using image processing methods, the interference of high jamming-to-signal ratio from the main lobe of radar is suppressed effectively. The simulation results indicate that the proposed method can effectively suppress interrupted-sampling repeater jamming in various environments.

Key words: interrupted-sampling repeater jamming, short-time fractional Fourier transform (STFrFT), image processing, frequency agility

CLC Number:

TN974

Jinjie LI, Yunhe CAO, Yulin ZHANG, Meng WANG. Interrupted-sampling repeater jamming suppression based on STFrFT[J]. Systems Engineering and Electronics, 2024, 46(10): 3312-3324.

Figures/Tables 18

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参数	数值	参数	数值
脉宽/μs	50	子脉冲脉宽/μs	5
带宽/MHz	50	子脉冲带宽/MHz	5
中心载频/GHz	9	脉内跳频间隔/MHz	5
脉冲重复周期/μs	100	采样频率/MHz	100
子脉冲数	10	目标距离/m	3 000

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Interrupted-sampling repeater jamming suppression based on STFrFT

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