FDA MIMO双基雷达主瓣走动矫正距离模糊杂波抑制  

Range ambiguous clutter suppression for FDA MIMO bistatic radar with main lobe correction

作　　者：王宇卓 朱圣棋[1] 李西敏 兰岚[1] WANG Yuzhuo;ZHU Shengqi;LI Ximin;LAN Lan(National Lab of Radar Signal Processing, Xidian University, Xi’an 710017, China)

机构地区：[1]西安电子科技大学雷达信号处理国家重点实验室,陕西西安710017

出　　处：《系统工程与电子技术》2022年第5期1483-1494,共12页Systems Engineering and Electronics

摘　　要：正侧视阵多输入多输出(multiple input multiple output,MIMO)双基地雷达系统在高重频脉冲体制下,其地面杂波具有严重的距离依赖性和杂波谱展宽问题。同时,双基地雷达多维杂波结构使其面临难以获得足够的训练样本、自适应权值算法复杂度高的困难。本文提出一种基于发射主瓣矫正的频率分集阵列(frequency diversity array,FDA)-MIMO双基地雷达距离模糊杂波抑制方法。该方法通过接收端等效发射方向图主瓣矫正,解决了主瓣照射角度走动的问题。通过等效发射方向图主瓣矫正补偿和接收信号后的反补偿处理,回波存在距离耦合的相位项,实现了不同距离杂波的有效区分,解决了杂波距离模糊问题,完成杂波抑制。同时,将三维搜索拆分为“2+1”的形式,先在发射角频率域和多普勒域对杂波进行抑制并进行目标参数搜索,再根据得到的目标发射角度和多普勒信息构建降维矩阵,在接收角频率域进行降维搜索,解决了杂波样本不足及运算量大的问题。该方法最终解决了双基地预警雷达大场景下地面距离杂波的模糊问题,仿真实验验证了所提方法的有效性。Under the high repetition rate pulse system,the ground clutter of the side looking multiple input multiple output(MIMO)array bistatic radar system has serious range dependence and clutter spectrum broadening problem.At the same time,the multi-dimensional clutter structure of bistatic radar faces the difficulty of obtaining sufficient training samples and high complexity of adaptive weighting algorithms.In this paper,a range ambiguous clutter suppression method for frequency diversity array(FDA)-MIMO bistatic radar based on transmitting main lobe correction is proposed.This method solves the problem of the main lobe illumination angle movement by correcting the main lobe of the equivalent emission pattern at the receiving end.Through the correction and compensation of the equivalent emission pattern main lobe and the reverse compensation after the received signal,the echo has a phase term of range coupling,which realizes the effective distinction of clutter at different range areas,solves the problem of clutter range ambiguity,and completes clutter suppression.The three-dimensional search is split into the form of“2+1”.Firstly,the clutter is suppressed in the emission angle frequency domain and the Doppler domain,and the target parameter search is performed.Then,construct a dimensionality reduction matrix according to the obtained target transmitting angle and Doppler information,and perform dimensionality reduction search in the receiving angle frequency domain,which solves the problem of insufficient clutter samples and large amount of calculation.Finally,this method solves the problem of ground range clutter ambiguity in the large scene of bistatic early warning radar.Simulation experiments verify the effectiveness of the proposed method.

关 键 词：多输入多输出雷达 双基地雷达系统 频率分集阵列 距离模糊杂波抑制 

分 类 号：TN959[电子电信—信号与信息处理]