从混合有色噪声背景中提取正弦随相调频信号的方法

提出了从混合有色背景噪声中提取正弦随机调频信号方法－－基于高阶累积量FIR自适应滤波方法。其主要特点是：FIR自适应滤波系数是用输入信号的四阶以上累积量进行更新的；FIR自适应滤波器是收敛于与有用信号类型匹配的滤波器。因此，它既能有效地提取有用信号（匹配信号），又能有效地抑制混合有色噪声（非匹配信号）。仿真结果表明，与短时相关方法相比，该方法是很有效的。

Method for Extracting Random Phase FM Signal From Mixed Colored Noise Background

A method of extracing sine random phase frequency modulation signal in mixed colored noise using cumulant-based finite impluse response adaptive filtering(CBFIRAF)was pro-posed.The central characteristic of the approach shows that coefficients of the FIR adaptive filter are updated using a recursive algorithm based on a sum of cumulant of orders greater than four of input signal and that the FIR adaptive filter converges to a type of signal-matched filters.Accordingly,the presented filter can not only detect available signal effectively but also suppress mixed colored noise betterly.Simulation and experimental results are included to show the high efficiency of the presented method in comparison with the adaptive short-term correlation(ASC)approach.