摘要
频谱弥散(SMSP)干扰是针对线性调频(LFM)脉冲压缩雷达的一种有效干扰手段。基于干扰信号的时频特征,提出了一种基于孪生波形设计的频谱弥散干扰抑制方法。首先,利用初始脉冲发射LFM信号,对受干扰回波进行Gabor变换得到时频分析结果,并估计干扰子脉冲数;其次,基于干扰子脉冲数设计第2个脉冲发射的孪生波形;然后,设计调制信号对干扰后的孪生波形进行时频搬移后重组;最后,通过匹配滤波处理实现干扰抑制。仿真实验表明:所提方法能主动调整设计发射波形相关参数,并有效利用干扰信号的能量,解决在干信比较大时干扰抑制较为困难的问题,避免复杂的信号分离算法。在干信比为25 dB时,经干扰抑制后的信干噪比增益可以达到60 dB以上。
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.
作者
刘治东
张群
罗迎
李瑞
LIU Zhidong;ZHANG Qun;LUO Ying;LI Rui(Institute of Information and Navigation,Air Force Engineering University,Xi’an 710077,China;Key Laboratory of Wave Scattering and Remote Sensing Information,Fudan University,Shanghai 200433,China)
出处
《航空学报》
EI
CAS
CSCD
北大核心
2022年第2期347-356,共10页
Acta Aeronautica et Astronautica Sinica
基金
国家自然科学基金(61631019,61971434)。
关键词
干扰抑制
频谱弥散(SMSP)干扰
时频分析
孪生波形
时频重组
jamming suppression
SMeared SPectrum(SMSP)jamming
time-frequency analysis
twin waveform
time-frequency restructuring
