基于Smeared Spectrum（SMSP）的分段特性提出了一种SMSP干扰抑制算法,即分段解调法。该算法首先利用离散匹配傅里叶变换,精确估计SMSP干扰的调频斜率,并利用该调频斜率构造解调函数。同时,利用干扰信号与雷达信号的调频斜率的比例关系,对雷达接收信号进行分段,再利用解调函数对分段后的雷达接收信号进行解调。由于解调信号的调频斜率和干扰调频斜率相同,因此干扰信号解调后变成单频信号,基于此特点在频域设计陷波器滤除SM-SP干扰。仿真结果表明该方法可有效抑制SMSP干扰。%A suppression approach is proposed based on the segmentation character of the SMSP jamming,which is a kind of subsection de-chirp algorithm.Firstly,the frequency rate of the SMSP jamming which is used to construct a de-chirp function,is estimated using the Discrete Match Fourier Transform.Meanwhile,the signal received is divided into several segments by the proportion relationship between the frequency rate of the SMSP jamming and the radar signal.Secondly,the divided signal is dechirped by the construct function.The dechirped jamming signal becomes a single-frequency signal because the construct function has the same frequency rate with the jamming signal,then a notch filter is designed to suppress the SMSP jamming.The simulation results indicate that this method can suppress the SMSP jamming effectively.
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