姿态稳定度误差对星载聚束SAR成像质量的影响分析  

Study on impact of attitude stability error on space-borne spotlight SAR image quality

作　　者：梁健[1] 张润宁[1] 王清泉 矫轲 陈刚 LIANG Jian;ZHANG Running;WANG Qingquan;JIAO Ke;CHEN Gang(Institute of Remote Sensing Satellite,China Academy of Space Technology,Beijing 100094,China;Lunar Exploration and Space Engineering Center,Beijing 100091,China)

机构地区：[1]中国空间技术研究院遥感卫星总体部,北京100094 [2]中国探月与航天工程中心,北京100091

出　　处：《空军预警学院学报》2021年第6期406-410,共5页Journal of Air Force Early Warning Academy

摘　　要：针对当前工程设计中星地一体化指标分解不充分导致工程实现难度增大的突出问题,研究了姿态稳定度误差对星载聚束SAR成像质量的影响;在构建距离向与方位向姿态稳定度误差模型的基础上,分析了成像过程中姿态稳定度误差与成像质量指标之间的定量传递关系.理论分析和仿真结果表明,姿态稳定度误差会引入成对回波,姿态稳定度误差频率越高成对回波离主瓣越远,幅度越大成对回波的幅度越大,成对回波会导致SAR成像分辨率、旁瓣比等指标恶化.研究成果可为卫星方案设计阶段误差分配与指标体系构建提供理论支撑.In view of the prominent problem of increasing difficulty in engineering implementation caused by insufficient index decomposition of satellite-earth integration in current engineering design, this paper makes studies on the effect of attitude stability error on the imaging quality of space-borne spotlight SAR. And then, on the basis of constructing the error models of attitude stability of range and azimuth, the paper analyzes the quantitative transfer relationship between attitude stability error and imaging quality index. Theoretical analysis and simulation results are shown as follows: The attitude stability error leads to paired echoed. The higher the frequency of attitude stability error, the farther the paired echo from the main lobe;the greater the amplitude is, the greater the amplitude of paired echo will be. The paired echo will lead to the deterioration of SAR imaging resolution, side-lobe ratio and other indicators. The research results can provide theoretical support for error distribution and index system construction in satellite scheme design stage.

关 键 词：星载SAR 姿态稳定度误差 聚束SAR 成像质量 

分 类 号：TN959.1[电子电信—信号与信息处理]