一种改进的星载SAR图像控制点几何校正模型  

Improved model of control point correction for spaceborne SAR image

作　　者：陈吉庭 余安喜[1] 董臻[1] 

机构地区：[1]国防科学技术大学电子科学与工程学院,湖南长沙410073

出　　处：《太赫兹科学与电子信息学报》2015年第5期763-768,共6页Journal of Terahertz Science and Electronic Information Technology

摘　　要：星载合成孔径雷达(SAR)用电磁波获取地球表面的电子图像。由于是侧视成像,SAR图像固有地含有定位误差,这些误差来源于SAR成像几何、成像模式、散射特性以及图像形成过程。因此,在SAR图像使用中必须考虑这些误差并予以校正。利用先验控制点信息可提高星载SAR图像定位精确度,校正几何畸变。分析了星载SAR图像定位的系统误差传递规律,通过将误差传递特性相似的系统误差源进行等效合并,提出了一种改进的系统误差校正模型,蒙特卡洛(Monte-Carlo)仿真实验验证了新模型具有更高的系统误差校正精确度。Spaceborne Synthetic Aperture Radar(SAR) obtains electronic image of the earth's surface using electromagnetic waves. For it is side-looking imaging, SAR image inherently contains geolocation error caused by SAR image acquisition geometry, imaging mode, scattering properties and image formation process. These errors should be considered and corrected for SAR image utilization. Geolocation accuracy of spaceborne SAR image and geometric distortion can be improved and corrected by using prior control point. The system error transfer law of spaceborne SAR image geolocation is analyzed. An improved system error correction model is proposed by combining the system error sources with similar error transfer characteristics. Monte-Carlo simulation results show that the new model has higher correction accuracy of system error.

关 键 词：先验控制点 几何校正 系统误差 误差源 校正模型 校正精确度 

分 类 号：TN957.52[电子电信—信号与信息处理]