斜视SAR成像处理中多普勒频率的新应用  

New Applications of Doppler Frequency in Squint SAR Imaging Processing

作　　者：刘光炎[1] 黄顺吉[1] 

机构地区：[1]电子科技大学电子工程系,四川成都610054

出　　处：《电子学报》2003年第6期829-832,共4页Acta Electronica Sinica

基　　金：国家 8 63计划项目 (No .863 2 .5 .2 .2 )

摘　　要：多普勒频率在斜视SAR成像处理中的新应用被发现 .由于斜视SAR方位向采样不同、脉冲重复频率不同 ,而且不同的斜距目标具有不同的多普勒频率 ,该文从雷达信号的回波模型入手 ,详细分析了回波信号的瞬时方位频率和瞬时多普勒频率及距离Chirp斜率对方位频率的影响 ,说明在CS算法中 ,选择适当的多普勒频率才能进行正确的成像 ,点目标仿真结果表明 ,该方法是合理的 ,能有效的进行距离压缩和方位聚焦 ,改善成像质量 .New applications of Doppler frequency have been found with Chirp Scaling algorithm(CSA)in squint SAR imaging. Considering the change of azimuth sample, the pulse repeat frequency difference in squint SAR data processing, and the Doppler frequency varying with different slant range targets, we carefully analyse the instantaneous azimuth frequency, the instantaneous Doppler frequency component of the azimuth frequency and the impact of range chirp on azimuth frequency, from the mathematical model of SAR echo signal. It explains that we should property select Doppler frequency in Chirp Scaling algorithm for correct SAR imaging. The results of point target simulation experiments show that our method is reasonable for squint SAR. It can effectively complete range compression and azimuth focusing, and can improve images' quality.

关 键 词：脉冲重复频率 多普勒频率 CS算法 距离chirp斜率 合成孔径雷达 

分 类 号：TN957[电子电信—信号与信息处理]