一种基于最大似然估计的宽带单脉冲测角改进方法  

Angle estimation improvement method for wide-band monopulse radar based on maximum likelihood estimate

作　　者：汪海波[1] 黄文华[1] 巴涛[1] 邵浩[1] 姜悦[1] WANG Haibo;HUANG Wenhua;BA Tao;SHAO Hao;JIANG Yue(Science and Technology on High Power Microwave Laboratory,Northwest Institute of Nuclear Technology,Xi’an 710024,China)

机构地区：[1]西北核技术研究所高功率微波技术重点实验室,陕西西安710024

出　　处：《系统工程与电子技术》2023年第12期3845-3851,共7页Systems Engineering and Electronics

摘　　要：电大尺寸目标的宽带散射回波可看成多个强散射中心的共同作用结果,回波表现为高分辨距离像(high-resolution range profiles,HRRP)的特点。如何利用多个散射中心的回波能量,以提升单脉冲测角的性能是值得深入研究的问题。本文给出的宽带雷达单脉冲测角的最大似然估计(maximum likelihood estimate,MLE)算法,该方法能够积累扩散到多个距离单元的回波能量,从HRRP中获得信噪比(signal to noise ratio,SNR)增益。提出了一种基于回波本身来确定目标距离支集的方法,并在距离支集上实施MLE算法。仿真研究表明:本文所提方法相比于加权平均法和最强点法,能够有效利用距离方向多个散射点的回波能量。MLE算法的均方根误差(root mean square error,RMSE)性能逼近克拉美罗下界(Carmer Rao low bound,CRLB)。The wide band scattering echoes of electrically large size targets can be regarded as the joint effect of multiple strong scattering centers,and the echoes are characterized by high resolution range profiles(HRRP).How to utilize the echo energy of multiple scattering centers to improve the performance of monopulse angle measurement is a problem worthy of further study.In this paper,the angle maximum likelihood estimate(MLE)algorithm for wideband monopulse radar could collect all the energy spreading in multiple range cells,which can obtain signal to noise ratio(SNR)gain from HRRP.A method to get range support set of target base on echo signal itself is proposed,thus MLE can be used on range support set.Simulation result shows that all of scattering center energy in the echo signal has been utilized,which performs better than weighted mean and dominant point methods.Root mean square error(RMSE)of MLE trends to Carmer Rao low bound(CRLB),asymptotically.

关 键 词：宽带雷达 单脉冲 最大似然估计 距离支集 

分 类 号：TN951[电子电信—信号与信息处理]