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合成孔径雷达(SAR,synthetic aperture radar)是对地遥感观测的重要技术手段.作为民用星载SAR的第一颗卫星,HJ-1C卫星即将发射,因此文中针对其成像处理中涉及的关键技术开展了研究工作,包括精确的斜视等效距离模型下的扩展ECS(extended chirp scaling)算法的补偿因子、三次相位误差补偿因子形式的分析,快速的回波数据模拟算法的建模和实现,以及精确的Doppler参数计算方法以及对扫描模式成像算法中拼接环节的算法改进.通过理论研究分析和仿真验证,证明基于等效斜视模型的扩展chirp scaling算法是适应条带、扫描成像模式的精确算法.
Synthetic aperture radar (SAR) is an important technique for remote sensing observation.As the first satellite of civil spaceborne SAR, the HJ-1C satellite is about to be launched, so the key technologies involved in its imaging are developed The research work includes the compensation factor of the extended chirp scaling (ECS) algorithm, the analysis of the form of the third-order phase error compensation factor, the modeling and implementation of the fast echo data simulation algorithm, and the precise Doppler parameters and the improvement of the splicing algorithm in the scanning mode imaging algorithm.Experimental analysis and simulation show that the extended chirp scaling algorithm based on the equivalent strabismus model is an accurate algorithm to adapt to the stripe and scan imaging modes.