一种雷达低空目标DOA估计方法  

A DOA Estimation Method for Radar Low-altitude Target

作　　者：谢昊青 秦琨 孟凡利 付康 白晓坤 XIE Haoqing;QIN Kun;MENG Fanli;FU Kang;BAI Xiaokun(Shanghai Aerospace Electronic Technology Institute,Shanghai 202012,China;The First Military Representative Office of Air Force in Shanghai,Shanghai 202012,China)

机构地区：[1]上海航天电子技术研究所,上海202012 [2]空军驻上海地区第一军代表室,上海202012

出　　处：《无线电工程》2021年第6期483-491,共9页Radio Engineering

摘　　要：针对多径信号严重影响雷达低空目标波达方向(Direction of Arrival,DOA)估计的问题,分析了曲面的多径信号模型,将最大似然(Maximum Likelihood,ML)算法进行改进并用于DOA估计当中,从搜索方式进行改进可以判断是否多径,利用先验知识从搜索角度域进行改进,降低了ML算法的运算量,该算法可以有效克服多径效应,不需要解相干,而且测角精度比起传统的单脉冲测角算法高,仿真结果验证了该算法的有效性。To address the serious effect of multipath signal to the Direction of Arrival(DOA)estimation of radar low-altitude target,the multipath signal model of the curved surface is analyzed,and the Maximum Likelihood(ML)algorithm is improved and used in the DOA estimation.The search method can be improved to determine whether it is multipath,the prior knowledge is used to improve the search angle domain,and the computation complexity of the ML algorithm is reduced.This algorithm can effectively overcome the multipath effect without the need for de-coherence,and the accuracy of angle measurement is higher as compared with the traditional monopulse angle measurement algorithm.The simulation results verify the effectiveness of the algorithm.

关 键 词：多径效应 最大似然算法 解相干 波达方向估计 

分 类 号：TN958.92[电子电信—信号与信息处理]