Cutting Compensation in the Time-Frequency Domain for Smeared Spectrum Jamming Suppression

Li Zeng,Hui Chen,Zhaojian Zhang,Weijian Liu,Yongliang Wang,Liuliu Ni

Electronics（2022）SCI 4区

Wuhan Univ | Wuhan Elect Informat Inst

Cited 7|Views6

Abstract

Smeared spectrum (SMSP) jamming is a new type of distance false-target jamming. It consists of multiple sub-pulses, which results in dense false targets at the radar receiver and affects the detection of target signal. Aiming at the suppression of SMSP jamming, in this paper we propose a fast jamming suppression method based on the time-frequency domain according to the time-frequency distribution characteristic of SMSP jamming. This method completely suppresses SMSP jamming in the time-frequency domain, retains the time-frequency points of the remaining target signal, uses the compensation method to obtain the lost target signal, and then restores the time-frequency distribution characteristic of the target signal. It will not produce jamming sidelobe after the recovered signal matched filtering in the time domain. Moreover, we can obtain the Doppler frequency in the time-frequency domain, which can be adopted in practical engineering applications. The simulation results illustrate the effectiveness of the proposed method.

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Key words

smeared spectrum (SMSP) jamming,fractional Fourier transform (FRFT),time-frequency domain,linear frequency modulation (LFM) signal,modulation slope

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