ScanSAR干涉测量中的关键误差影响

Influence study of key errors for wide swath SAR interferometry

ScanSAR模式具有宽观测带和重访时间短的优点,广泛应用于地表形变监测,在监测缓慢形变领域具有宽广的前景。ScanSAR干涉测量与条带干涉一样,降低基线误差和DEM残差影响是其主要瓶颈。本文分析了ScanSAR的成像原理及误差成因,针对Bam地震的ScanSAR干涉图,比较了SRTM3和GDEM在ScanSAR差分干涉中的影响大小,对采用3种不同精度的ENVISAT轨道数据得到的ScanSAR干涉结果进行了比较研究,研究结果可为相关领域提供参考。

Wide swath SAR（ ScanSAR model）has some characters such as wider swath and short interval so that it can be applied widely to monitor deformation, especially it has larg foreground for monitoring slowness deformation. Depressing baseline and DEM error is a key choke point for ScanSAR interferometry. In this paper, ScanSAR imaging principle and error elements were analyzed, in allusion to wide swath SAR interferogram of Bam earthquake, influence magnitude of SRTM3 and GDEM for ScanSAR interferometry was compared each other, at the same time, the results of ScanSAR interferometry which uses Envisat orbit data of three different kinds were studied. The conclusion could provide reference for the field.