一种基于聚束式SAR图像的单脉冲测角方法  

A Method of Monopulse Angle Measurement Based on Spotlight SAR Images

作　　者：宫兰晖 李凉海 张振华 

机构地区：[1]北京遥测技术研究所,北京100076

出　　处：《遥测遥控》2014年第4期32-38,共7页Journal of Telemetry,Tracking and Command

基　　金：十二五总装精导组装备预先研究项目(No.51301020201)

摘　　要：传统单脉冲雷达把舰船目标当作点目标处理,海面杂波对其影响较大,它对小目标无法进行有效监测,限制了该项技术的应用范围。提出一种基于聚束式SAR图像的单脉冲测角方法,解决了雷达对小目标能量重心的精确测角问题。首先对目标进行多通道高分辨成像,然后通过对雷达图像进行单脉冲测角估算出目标上散射点相对于雷达天线波束中心轴的角度偏差,最后对目标上较强散射点的单脉冲测角值进行加权相加,从而估计出目标能量重心处的角度值。仿真结果验证了方法的有效性。Ship targets are considered as point targets in a traditional monopulse radar.However,the powerful sea clutter makes the monitoring for small targets invalid and limits the application of the monopulse radar technology.Thus,a method of monopulse angle measurement based on spotlight SAR images is proposed,which can measure the angle deviation between small target＇s energy center of gravity and the radar antenna beam＇s center axis accurately.Firstly,the target is imaged with high resolution in multichannel.Then,the multichannel radar images are used in monopulse angle measurement,to estimate the angle deviations between the scattering points of the target and the radar antenna beam＇s center axis.Finally,the angle deviations between the more powerful scattering points and the radar antenna beam＇s center axis are weighted by a vector,therefore the angle deviation between the target＇s energy center of gravity and the radar antenna beam＇s center axis is obtained.The simulation result demonstrates the effectiveness of the method.

关 键 词：聚束式SAR图像 单脉冲测角 目标能量重心 

分 类 号：TN953[电子电信—信号与信息处理]