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- 2017
CryoSat-2 SARIn数据干涉处理及DEM获取
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Abstract:
CryoSat-2搭载的合成孔径/干涉雷达高度计能够精确地探测海洋与大陆冰面高程变化，其合成孔径干涉模式（synthetic aperture interferometric mode，SARIn）提供的干涉数据可以利用传统差分干涉测量技术反演地面的高程信息，但在欧洲空间局公布的SARIn 二级产品没有充分地利用这一信息。介绍了SARIn模式工作原理，并结合传统干涉测量技术，提出利用SARIn 一级（level 1b，L1b）数据进行数字高程模型提取的算法和流程。通过数据质量检查，剔除数据中的错误信息；通过信号强度和相干性选择合适的解缠起点，实现干涉数据的逐行解缠；计算出卫星视角，结合卫星姿态、速度、位置和视线向距离等信息计算地面点的三维信息，最终插值生成SARIn DEM（digital elevation model）。利用该算法对2012年1月~4月的SARIn L1b数据进行干涉处理，获得了南极Lambert冰川流域局部地区的数字高程模型。通过对比ICESat DEM和RMAP DEM，表明SARIn DEM具有较高的精度，能够满足南北极等地区的高程变化研究
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