基于回波数据的高分辨力机载SAR运动补偿  

High Resolution Airborne SAR Motion Compensation Based on Echo Data

作　　者：雷万明[1] 胡学成[1] 

机构地区：[1]南京电子技术研究所,南京210013

出　　处：《电子与信息学报》2004年第12期1908-1914,共7页Journal of Electronics & Information Technology

摘　　要：该文详细地分析了基于距离压缩数据的运动补偿和基于复图像的运动补偿的机理,提出了基于 回波数据的高分辨力机载SAR运动补偿算法.该算法采用子孔径技术,利用修改的最大对比度法提取子孔 径的多普勒调频斜率,作距离压缩数据的时域运动补偿,然后用PGA作复图像的频域运动补偿.实录数据 的成像实验表明,该算法能有效地克服单一运动补偿算法的场景依赖性,获得比较满意的成像质量.This paper amply analyzes the airborne SAR motion compensation mechanism on the range compression data and complex image data, and proposes a motion compensation algorithm for the high resolution airborne SAR. This algorithm makes use of the sub-aperture technique to estimate the sub-aperture's Doppler rate with the improved maximum contrast method, and then performs time-domain motion compensation for range compressing data and executes the frequency-domain motion compensation for complex image with PGA method. The raw data imaging result shows that the algorithm can effectively overcome the disadvantage of the scene dependence of the singularity motion compensation algorithm, and improve the SAR image quality.

关 键 词：运动补偿 机载SAR 成像 PGA 

分 类 号：TN957.51[电子电信—信号与信息处理] TN958[电子电信—信息与通信工程]