无控制条件下星载InSAR干涉定标方法研究
首发时间:2017-05-23
摘要:干涉定标是基于星载合成孔径雷达干涉(Interferometric Synthetic Aperture Radar, InSAR)技术获取高精度数字高程模型(Digital Elevation Model, DEM)过程中的必要步骤。针对地表任意区域内难以获取有效定标点的现状,本文提出将冰、云和陆地高程卫星/地学激光测高系统(Ice, Cloud and land Elevation Satellite/Geoscience Laser Altimeter System, ICESat/GLAS)测量点作为定标点进的思路。在外部已有DEM支持下,通过计算每个定标点高精度SAR像素坐标实现干涉定标。将该方法应用于覆盖北京城区TanDEM-X数据进行干涉定标处理,结果表明定标生成的DEM与野外实测控制点之间高程中误差为1.27 m,平面中误差为9.40 m。
关键词: 干涉定标 InSAR ICESat/GLAS DEM
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Spaceborne InSAR Calibration With None Ground Control Point
Abstract:Interferometric calibration is an essential step in the generation of high quality DEM by using the InSAR technique. However, the available of calibration points for an arbitrary region is generally impractical. In this paper, we proposed a method to perform interferometric calibration by using the ICESat/GLAS measurements as the calibration points. With the supporting of external DEM, we calculated the corresponding SAR pixel coordinates of each calibration point with a high precision. We applied the method to a pair of TanDEM-X data that covers Beijing region as a test. The test results show that the root mean square error (RMSE) between the generated DEM and the field measurements on the control points are 1.27 m and 9.4 m in vertical and horizontal direction, respectively.
Keywords: Interferometric calibration InSAR ICESat/GLAS DEM
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No.4733675120090714****
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