基于差分预处理的米波雷达低仰角处理算法  

An Algorithm Based on Differential Preprocessing of Low Elevation Estimation in VHF Radar

作　　者：赵光辉[1] 陈伯孝[1] 吴向东[1] 张守宏[1] 

机构地区：[1]西安电子科技大学雷达信号处理重点实验室,西安710071

出　　处：《电子与信息学报》2009年第2期363-365,共3页Journal of Electronics & Information Technology

基　　金：国家部委级项目(51307050201);教育部新世纪优秀人才支持计划项目(NCET-06-0856)资助课题

摘　　要：由于多径信号的存在,使得米波雷达难以对低仰角目标进行高度测量,为此该文提出一种适用于多径情况下的波达方向估计方法。该方法通过差分处理,补偿了多径信号回波延迟的相位,使得接收回波中仅包含直达波信号,对差分后数据进行常规数字波束形成即可得到目标俯仰角。Monte-Carlo试验结果表明在进行低仰角测高过程中,该方法性能优于空间平滑和线性预测等方法。某米波雷达的实测数据验证了该方法的可行性与有效性。Considering the presence of multi-path propagation, it is quite difficult for VHF radar to measure the altitude of a low elevation target. In this paper, a new algorithm is proposed to estimate the DOA of the target, which by using the differential preprocessing, the phase of the multipath wave can be compensated, the echo from multi-path propagation can be subtracted form the signal that received. Then the general DBF can be used to estimate the direction of the direct wave. The Monte-Carlo experiments prove that the performance of the new algorithm is better than that of the spatial smoothing technique and the forward-backward predictors for bearing estimation. The real data from some VHF radar demonstrates the validity and feasibility of the new algorithm.

关 键 词：米波雷达 测高 多径 DOA 超分辨 

分 类 号：TN958[电子电信—信号与信息处理]