基于变步长RDNLMS的机载外辐射源雷达杂波对消  

Clutter Cancellation for Airborne Passive Radar Based on Variable-Step-Size RDNLMS

作　　者：刘智勇[1] 李小波 周青松 张剑云 LIU Zhiyong;LI Xiaobo;ZHOU Qingsong;ZHANG Jianyun(Electronic Engineering College,National University of Defense Technology,Hefei 230037,China)

机构地区：[1]国防科技大学电子对抗学院,合肥230037

出　　处：《电光与控制》2020年第6期105-110,共6页Electronics Optics & Control

摘　　要：机载外辐射源雷达面临多普勒展宽的直达波和强杂波干扰,传统的归一化最小均方(NLMS)算法难以消除此类杂波。针对这一问题,提出一种变步长距离-多普勒归一化最小均方(VSS-RDNLMS)算法。该算法利用距离-多普勒NLMS(RDNLMS)算法的优势,在距离维和多普勒维同步对消杂波,同时,根据输出误差信号和系统噪声控制步长改变,在保证收敛速度的前提下,降低了算法的稳态误差。仿真实验表明:在相同的仿真条件下,VSS-RDNLMS算法可以显著改善机载外辐射源雷达的杂波对消性能,有效降低对消残差,提高目标信噪比。Airborne passive radar is faced with interferences of Doppler broadening direct waves and strong clutters,but the traditional Normalized Least Mean Square(NLMS)algorithm is difficult to eliminate such interferences.In order to solve this problem,a Variable-Step-Size Range-Doppler NLMS(VSS-RDNLMS)algorithm is proposed.The algorithm is improved on the basis of RDNLMS algorithm to eliminate clutters on the distance and Doppler synchronously.At the same time,the output error signal and system noise are used to control the step size.Therefore,the steady-state error of the algorithm is reduced on the premise of ensuring the convergence speed.The simulation results show that,under the same simulation conditions,the VSS-RDNLMS algorithm can obviously improve the clutter cancellation performance for airborne passive radar,effectively reduce the cancellation residual,and improve the SNR of target.

关 键 词：机载外辐射源雷达 RDNLMS算法 杂波对消 变步长 

分 类 号：TN958[电子电信—信号与信息处理]