海面运动引起的合成孔径雷达(SAR)成像多普勒频率特性  

Characters of SAR Imaging Doppler Frequencies Caused by Sea Surface Motion

作　　者：谢涛[1,2] 旷海兰[1] 陈伟[1] 沈涛[1] 

机构地区：[1]武汉理工大学信息工程学院,武汉市珞狮路122号430070 [2]中国科学院遥感应用研究所遥感科学国家重点实验室,北京市大屯路甲20号100101

出　　处：《武汉大学学报（信息科学版）》2010年第12期1470-1473,1490,共5页Geomatics and Information Science of Wuhan University

基　　金：国家自然科学基金资助项目(40706058);国家863计划资助项目(2007AA12Z170);武汉市青年科技晨光计划资助项目(200850731388)

摘　　要：根据推导出的线性海面与非线性海面运动引起的多普勒频率公式,数值模拟了水平方向和垂直方向海面运动引起的SAR成像多普勒频率分布,发现了有应用价值的多普勒频率特性,即线性海面与非线性海面水平方向运动所致多普勒频率分布相同,与海面状态无关;与线性海面相比,非线性海面垂直方向运动引起的多普勒频率特性更加突出海面局部特征。Doppler frequency caused by linear and nonlinear sea surface motion are deduced.Numerical results show that Doppler frequencies distribution in SAR range direction has useful characters.Doppler frequencies caused by sea surface moving along horizontal direction of nonlinear sea surface has the same result as those of linear sea surface.It is one of basic theories of moving targets detection from sea surface.Compared with linear sea surface,Doppler frequencies characters caused by vertical moving nonlinear sea surface can provide more characters of local sea surface patches.This finding can be used to detect targets related to sea surface or freak waves.

关 键 词：非线性 海面 合成孔径雷达 多普勒频率 

分 类 号：P237.3[天文地球—摄影测量与遥感] P229.2[天文地球—测绘科学与技术]