星载寄生式SAR多普勒特性分析  

Doppler Property Analysis of Spaceborne Parasitic SAR

作　　者：何峰[1] 梁甸农[1] 刘建平[1] 

机构地区：[1]国防科技大学电子科学与工程学院,湖南长沙410073

出　　处：《信号处理》2004年第5期475-480,469,共7页Journal of Signal Processing

基　　金：国家973计划项目

摘　　要：本文基于星载双基地雷达空间几何关系,给出了星载寄生式SAR系统中小卫星多普勒参数的两种表达形式,进一步给出了与多普勒特性相关的几个重要系统参数的表达式。分析了基线和相对速度对小卫星多普勒特性参数偏移主星参数的影响,指出基线是主要影响因素;对多普勒中心频率影响大,对多普勒调频斜率及方位分辨率影响小。分析了利用寄生式SAR提高方位分辨率的能力和限制因素。Based on geometric relationship among satellites, the Earth and radar, expressions of two Doppler parameters of SAR radar onboard small satellites of spaceborne parasitic SAR system are given in two different forms. From the results, expressions of several other important system parameters related to Doppler property are also given. Influences of baseline and relative velocity on these parameters are analyzed. Its found that baseline extent is the main influence. Doppler centric frequency is influenced much greater than Doppler FM rate and azimuth resolution is. Capability and limitation of improving azimuth resolution by combining the data obtained by different small satellites are analyzed too.

关 键 词：多普勒特性 SAR 星载 方位分辨率 多普勒调频斜率 双基地雷达 多普勒中心频率 影响 分析 寄生 

分 类 号：TP391[自动化与计算机技术—计算机应用技术] TN958[自动化与计算机技术—计算机科学与技术]