摘要
外辐射源雷达系统中,直达波干扰严重影响了雷达对目标的探测性能。文中针对直达波干扰问题,通过对LMS、NLMS、改进的NLMS算法的收敛速度、时变系统跟踪能力、失调量等的分析,将改进的归一化LMS(NLMS)自适应滤波算法应用于直达波干扰抑制,取得了较好的处理效果,其对消得益可达40dB;分析了滤波器阶数、参数选择对对消性能和信噪比损失的影响,给出了典型参数值。最后,真实数据的处理结果验证了该方法的有效性。
In a radar system based on opportunity illuminators, direct path interference from the illuminator would affect seriously radar target detection performance. To restrict direct path interference, the speed of convergence and track-ability of LMS, NLMS and improved NLMS are analyzed in this paper. Then adaptive filter algorithm of improved NLMS is applied, and the cancellation gain obtained is about 40 dB. Finally, the effect of filter order and parameter of improved NLMS on cancellation performance and SNR loss is analyzed, and typical parameters of improved NLMS are presented. Simulation results based on practical data shows the efficiency of the algorithm.
出处
《现代雷达》
CSCD
北大核心
2009年第11期32-35,共4页
Modern Radar
