一种改进的基于DEM的机载重轨干涉SAR运动补偿算法
doi: 10.3724/SP.J.1146.2008.00203
An Improved Topography-Dependent Motion Compensation Approach for Airborne Repeat-Pass Interferometric SAR Systems
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摘要: 该文研究了基于DEM(Digital Elevation Model)的高精度重轨干涉SAR运动补偿算法。分析了平地假设及波束中心近似造成的残余运动误差的影响，表明对重轨干涉SAR系统进行基于DEM的高精度运动补偿的必要性。分析了对外部DEM数据精度要求，指出利用低精度DEM数据进行精确运动补偿获取高精度DEM数据的可行性。针对现有基于DEM运动补偿算法的不足提出改进算法。该算法根据载机轨迹偏移和地形起伏自动调节参数，可实现精确且高效的运动补偿。对X波段重轨干涉SAR数据进行运动补偿处理，验证了该算法的有效性及其在精度和效率两方面相比于现有算法的优势。Abstract: In this paper, the precise topography-dependent motion compensation for repeat-pass InSAR is studied. The effects of the residual motion errors caused by the flat surface assumption and center-beam approximation are analyzed, which shows the necessity of performing a precise topography-dependent motion compensation for the repeat-pass InSAR systems. The precision requirement for the external DEM data is analyzed to show the feasibility of deriving precise DEM data by motion compensation based on rough DEM data. An improved approach is presented according to the deficiencies of the existing topography-dependent motion compensation approaches. It can adjust the parameters according to the conditions of trajectory deviations and topography variations, so it has the advantage of performing the precise motion compensation efficiently. Finally, the processing results of the X-band airborne repeat-pass interferometric SAR data confirm its validity and superiority in precision and efficiency compared to the original algorithms.
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