基于分数阶傅里叶域K谱线算法的LFM干扰抑制

LFM Interference Suppression Using K-bins Algorithm in Fractional Fourier Domain

针对线性调频(LFM)信号在分数阶傅里叶域的加窗特性,提出了一种基于分数阶傅里叶域K谱线算法的LFM干扰抑制方法。该算法直接把分数阶傅里叶域干扰所在的K根谱线进行定位和消除,从而避免了对门限值的求取。仿真结果表明该算法具有良好的抗线性调频干扰性能,而且当干扰幅度呈现非平稳变化时其性能优于门限法。

By the feature of windowed Linear Frequency Modulation （LFM） signal in fractional fourier transform domain, an algorithm called K-bins was proposed to suppress the LFM interference. Because the K-bins where the interference exists are directly allocated and removed, the threshold is not necessary. Simulation results show that the performance of the proposed algorithm is high, and the algorithm is supper to the threshold algorithm when the amplitude of the interference is non-stationary.