大掠射角对海雷达导引头实测回波特性分析  

Analysis of radar seeker sea-surface echoes at a high grazing angle

作　　者：连静 杨勇[1] 谢晓霞[1] 王雪松[1] LIAN Jing;YANG Yong;XIE Xiaoxia;WANG Xuesong(State Key Laboratory of Complex Electromagnetic Environment Effects on Electronics and Information System,National University of Defense Technology,Changsha 410073,China)

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

出　　处：《系统工程与电子技术》2024年第5期1535-1543,共9页Systems Engineering and Electronics

基　　金：国家自然科学基金(62171447,61971429,61871385)资助课题。

摘　　要：大掠射角下,对海雷达导引头观测到的海杂波强度激增,舰船目标检测困难。本文结合全极化雷达导引头挂飞实测数据,分析了回波幅度和相位特性。首先,采用典型分布对回波幅度分布进行拟合,并利用拟合优度对拟合效果作出评估;然后,分析了平均相位变化量。结果表明:在大掠射角条件下,雷达导引头各极化通道海杂波幅度服从K分布;海杂波与舰船回波幅度在同极化通道服从K分布,在交叉极化通道服从对数正态分布;交叉极化通道回波信杂比高于同极化通道;海杂波与舰船回波相位平均变化量小于海杂波。The sea clutter intensity observed by the sea radar seeker at a high grazing angle increases sharply where ship-detection performance can be a problem.The analysis in this paper describes the amplitude and phase characteristics of radar echoes based on measured data collected by airborne radar seekers.Firstly,the data are fitted to commonly used probability distribution functions respectively,and then the goodness of fit is used to obtain the optimal distribution model.Finally,the average phase difference is analyzed.The results show that the K distribution is a good fit for sea-clutter data at a high grazing angle,the K distribution is a good fit for the co-polarization ship echoes plus sea clutter data,the Log-normal distribution is a good fit for the cross-polarization ship echoes plus sea clutter data,the signal-to-clutter ratio for the cross-polarization is higher than the co-polarization,the average phase difference of ship echoes plus sea clutter is smaller than sea clutter.

关 键 词：雷达导引头 海杂波 大掠射角 幅度分布 相位变化 

分 类 号：TN959.21[电子电信—信号与信息处理]