基于孪生波形设计的频谱弥散干扰抑制方法

doi:10.7527/S1000-6893.2020.24947

Abstract

Abstract: The SMeared SPectrum (SMSP) jamming is an effective jamming method against Linear Frequency Modulation (LFM) pulse compression radar. Based on the time-frequency characteristics of the jamming signal, a SMSP jamming suppression method is proposed based on the twin waveform design. First, the LFM signal is transmitted by the initial pulse, and the results of time-frequency analysis are obtained by Gabor transformation of the jamming signal. Then, the number of the interference sub-pulse is estimated. Second, based on the number of the interference sub-pulse, the twin waveform transmitted by the second pulse is designed. Then, modulated signals are designed to carry out time-frequency shift and recombination of the jamming twin waveforms. Finally, interference suppression is realized through matched filtering. Simulation experiments show that the method proposed can actively adjust the relevant parameters of the transmit waveform, and effectively utilize the energy of the interference signal. The method can solve the problem of difficulty in interference suppression when the jamming-to-signal ratio is large, and can avoid the use of complex signal separation algorithm. When the jamming-to-signal ratio is 25 dB, the gain of signal-to-interference plus noise ratio after interference suppression can reach more than 60 dB.

Key words: jamming suppression, SMeared SPectrum (SMSP) jamming, time-frequency analysis, twin waveform, time-frequency restructuring

CLC Number:

V243.2

LIU Zhidong, ZHANG Qun, LUO Ying, LI Rui. A smeared spectrum interference suppression method based on twinwaveform design[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2022, 43(2): 324947-324947.

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A smeared spectrum interference suppression method based on twinwaveform design

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