Impact Analysis of InSAR Spatio-temporal Baseline on DEM Accuracy

doi:10.13474/j.cnki.11-2246.2018.0045

Abstract

Abstract:

InSAR is an important method of acquiring global DEM.However,the InSAR topographic mapping processing is affected by various interferometric factors,in which baseline is one of the most important elements.We quantitatively analyzed the effect of spatio-temporal baseline in InSAR topographic mapping,and analyzed 40 TerraSAR-X images of Tianjin which composed 780 interferograms after image processing.The experimental results show that the larger spatial baseline is,the higher the accuracy of elevation is,and there is a power function relationship.There is a linear function relationship between temporal baseline and accuracy of elevation,and great temporal baseline comes low accuracy of elevation.Therefore,in the process of topographic mapping,it is necessary to use the longest spatial baseline as long as the coherence is ensured,while ensuring a short temporal baseline in order to eliminate time decorrelation.This paper provides technical reference for the configuration design of homemade SAR satellite.

Key words: InSAR, spatial baseline, time baseline, DEM accuracy

CLC Number:

P237

WANG Zhidong, TANG Xinming, LI Tao. Impact Analysis of InSAR Spatio-temporal Baseline on DEM Accuracy[J]. 测绘通报, 2018, 0(2): 61-66.

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