多径条件下子阵级低角测高算法

针对多径条件下的测高问题,提出了一种子阵级处理新算法.采用均匀子阵划分形成三个子阵；在子阵级解析求出协方差矩阵的正交矢量,进而构造仰角谱,谱峰的位置即目标仰角；还可以估计出复反射系数.仿真分析给出了该方法的性能与SNR、目标仰角以及复反射系数的关系,某米波雷达实测数据检验了该方法的有效性,仰角测量误差达到阵列天线波束宽度的1/84.研究表明:该算法本身不依赖未知的复反射系数,并且信号处理维数低,运算量较低,可以应用在舰载雷达和米波三坐标雷达中.

Low-angle height finding algorithm at sub-array level under multi-path environment

Aimed at the Low-angle Height Finding problem under multi-path environment,a novel low angle height finding algorithm at sub-array level is proposed.First,the whole array was divided into three equal sub-arrays.Then,the orthogonal vector of covariance matrix at sub-array level was calculated accurately,not by Eigen Decomposition.Next,the angle spectrum was presented,whose peak just accords with the DOA of target.Finally,the complex reflection coefficient was estimated after the estimated DOA.How this algorithm relies on the SNR,the target’s elevation and complex reflection coefficient has been explained by simulations.Its efficiency was verified by outdoor data obtained by VHF band radar.The elevation angle error is 1.19 percent of beam width of array.This algorithm is independent on the unknown complex reflection coefficient,and the computation is lowered greatly.It can be applied in ship-borne radar and VHF band 3-coordinate radar.