基于双谱的eLORAN接收机干扰抑制方法研究

Research on Interference Suppression Algorithm based on Bispectrum for eLORAN Receiver

针对eLORAN导航定时接收机传统自适应滤波干扰抑制算法性能易受高斯噪声影响的问题,提出了一种基于双谱检测的干扰抑制方法。该方法采用双谱估计,在高斯噪声中检测出干扰信号,再用检测信号调节自适应滤波器的系数,完成系数更新,最终达到去除干扰的目的。理论分析与实验结果表明:双谱检测方法能够有效的抑制高斯白噪声,提取信号。基于双谱检测的干扰抑制方法,可有效去除和减轻干扰,特别是在强高斯噪声干扰的情况下,抑制干扰效果明显,解决了e LORAN接收机在强噪声下的干扰抑制问题,具有一定的推广和应用价值。

In order to improve the performance of eLORAN navigation and timing receiver,such as enhancing the capability of interference and noise suppression,an interference suppression algorithm based on bispectrum for adaptive filtering was proposed. Using bispectrum method,the additive Gaussian white noise can be suppressed and the interference can be detected,then coefficient of the adaptive filter is updated by the detected signal,and finally interference can be eliminated. The theoretical analysis and experiment results show that the interference with additive Gaussian white noise can be well detected and eliminated,especially in the case of strong noise. The interference suppression problem of eLORAN receiver in strong noise can be solved with this method.