大气折射对高分辨率机载SAR性能的影响分析  

Effects of atmospheric refractivity on high resolution airborne SAR performance

作　　者：孙进平[1] 王彦平[2] 洪文[2] 毛士艺[1] 

机构地区：[1]北京航空航天大学电子信息工程学院203教研室,北京100191 [2]中国科学院电子学研究所微波成像技术国家重点实验室,北京100190

出　　处：《系统工程与电子技术》2012年第4期681-685,共5页Systems Engineering and Electronics

基　　金：国家自然科学基金(60901056;61072112)资助课题

摘　　要：对于高分辨率机载合成孔径雷达(synthetic aperture radar,SAR)系统,在电波传播的对流层中由于大气介质的折射率随高度变化,所产生的相位误差将影响其成像性能。分析了对流层大气折射率的变化,采用Hopfield折射率模型,给出雷达与地面目标之间视在距离的计算方法,对大气折射率变化影响高分辨率机载SAR性能的机理进行分析,利用数值计算的方法,给出X波段和Ku波段SAR在不同分辨率下的最大作用距离,并仿真了大气折射影响SAR图像聚焦的实际效果。For an airborne synthetic aperture radar（SAR） system with high resolution,the phase error caused by the changes of atmosphere refractive index in troposphere with height will affect the performance of imaging.The changes of atmosphere refractive index in troposphere with the Hopfield refractive model are analyzed,and the calculation of the apparent range between radar and ground targets is given.The mechanism of the influence of the changing atmospheric refractivity on the high resolution airborne SAR is also analyzed.The maximal imaging ranges of X-band and Ku-band SAR under different resolutions are given with a numerical method.In addition,the practical effect of atmospheric refractivity on the focusing of SAR imaging through simulation is presented.

关 键 词：合成孔径雷达 高分辨率 大气折射 成像性能 

分 类 号：TN95[电子电信—信号与信息处理]