Technology and Methodology |
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Kalman filter phase unwrapping algorithm of SAR interferogram in low coherence region based on DEM |
HAO Huadong1, LIU Guolin2, CHEN Xianlei1, CAO Zhentan2 |
1. Metrology Verification and Testing Institute, Zhoushan Institute of Calibration and Testing for Qualitative and Technical Supervision, Zhoushan 316021, China;
2. Geomatics College, Shandong University of Science and Technology, Qingdao 266510, China |
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Abstract Phase unwrapping is one of the key technologies for the utilization of Interferometric Synthetic Aperture Radar (InSAR) to conduct DEM extraction and small surface deformation measurement. The conventional Kalman filter phase unwrapping algorithm can obtain reliable results in flat terrain areas, but it will cause error transmission and not make the accurate inversion of surface deformation information in the steep terrain. This paper presents a Kalman filter phase unwrapping algorithm of SAR Interferogram based on DEM. With the DEM topographic information obtained by the U.S. Space Shuttle Radar Topography Mission (SRTM) to guide SAR Interferogram and implement unwrapping, it can improve the speed and accuracy of unwrapping. A comparison with the conventional Kalman filter algorithm shows that the proposed Kalman filter phase unwrapping algorithm can achieve good results, especially in improving unwrapping accuracy in the low coherence region by using the SRTM DEM information to guide unwrapping.
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Keywords
high resolution satellite remote sensing
uranium mineralization bleached alteration
typical application
north fringe of Tarim basin in Xinjiang
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Issue Date: 21 February 2013
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