基于波形特征的外辐射源雷达杂波抑制算法  

Waveform characteristic based clutter suppression algorithm for passive bistatic radar

作　　者：赵志欣[1] 周新华 朱斯航 洪升[1] 王玉皞[1] ZHAO Zhixin;ZHOU Xinhua;ZHU Sihang;HONG Sheng;WANG Yuhao(School of Information Engineering,Nanchang University,Nanchang 330031,China)

机构地区：[1]南昌大学信息工程学院,江西南昌330031

出　　处：《系统工程与电子技术》2018年第9期1966-1972,共7页Systems Engineering and Electronics

基　　金：国家自然科学基金(61461030;61661032;61761030);江西省教育厅自然科学项目(20152ACB21008;20161BAB203079;20161BAB212038)资助课题

摘　　要：在正交频分复用(orthogonal frequency division multiplexing,OFDM)波形外辐射源雷达系统中,相对于直达波和多径回波,目标回波的功率要微弱许多,因此多径杂波抑制是此雷达信号处理的一项关键技术。许多时域自适应滤波算法被用来抑制直达波和多径回波,但往往存在滤波器阶数过多,或计算负担过高的问题。基于OFDM波形的多载波调制特性,提出了分载波自适应滤波算法,相比于常规时域自适应滤波算法,能够有效降低滤波器阶数和计算复杂度,简单且高效。以基于OFDM调制原理的数字调幅广播外辐射源雷达为例,详细介绍了分载波递归最小二乘和分载波归一化最小均方算法的自适应滤波原理和过程,并基于仿真和实测数据分析比较了常规时域自适应滤波算法和分载波自适应滤波算法的性能差异。In passive bistatic radar system with orthogonal frequency division multiplexing（OFDM）waveform,the power of the target echoes is much weaker than the power of direct-path wave and that of multipath echoes,so multipath clutter suppression is a key technology of radar signal processing.Many temporal adaptive filtering algorithms are used to suppress multipath clutter,but they often have the problems of long filter order and high computational burden.Based on the multicarrier modulation of OFDM waveform,this paper proposes a subcarrier adaptive filtering algorithm.It can effectively reduce the order of filter and computational complexity compared with the traditional temporal adaptive filtering algorithm.This paper,taking digital radio mondialebased passive bistatic radar which employs OFDM technique for example,introduces the adaptive filtering processes of recursive least square by subcarrier and normalized least mean square by the subcarrier algorithm in detail.Furthermore,the performances of the traditional temporal adaptive filtering algorithm and the subcarrier adaptive filtering algorithm are further analyzed.

关 键 词：外辐射源雷达 正交频分复用波形 多径杂波抑制 分载波自适应滤波 数字调幅广播 

分 类 号：TN958.97[电子电信—信号与信息处理]