阵列雷达波束内双目标的极大似然角度估计方法  

Maximum likelihood angle estimation of two targets with array radar

作　　者：吴佳妮[1] 陈永光[2] 徐振海[1] 熊子源[1] 王雪松[1] 

机构地区：[1]国防科技大学电子信息系统复杂电磁环境效应国家重点实验室,湖南长沙410073 [2]北京跟踪与通信技术研究所,北京100094

出　　处：《国防科技大学学报》2016年第6期130-135,共6页Journal of National University of Defense Technology

基　　金：国家自然科学基金资助项目(61401488;61490694);国家863计划资助项目(2013AA122202)

摘　　要：单波束内目标往往相距较近,采用传统角度分辨技术难以将其分辨,从而给目标跟踪和识别带来较大困难。于是提出基于LM算法的极大似然角度估计方法,实现波束内双目标的分辨。该方法在阵列雷达的基础上建立双目标回波模型,推导极大似然角度估计算法。考虑到求解算法直接影响极大似然角度估计的收敛速度和估计精度,利用LM算法实现了极大似然估计的求解,从而得到目标角度的精确估计。该方法避免了多次脉冲相干积累,具有计算量小的特点。仿真结果验证了方法的有效性。As the targets in the same beam are close to each other, it is difficult to resolve them via traditional techniques. Furthermore, it also brings difficulty in detecting and tracking. The problem of resoling two targets in the same beam was studied with array radar. An echo model of two unresolved targets with array radar was established. An improved angle estimation method was proposed based on the maximum likelihood estimation principle. In consideration of the convergence speed and estimation accuracy, the Levenberg-Marquardt method was applied to obtain the maximum likelihood estimation of target direction. The simulation results prove that the method performs well in several aspects, including smaller estimation error and computational cost.

关 键 词：单波束内双目标 极大似然估计 LM算法 

分 类 号：TN95[电子电信—信号与信息处理]