Development of SAR Interferometry Analysis and its Application to Crustal Deformation Study

概要

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Software for Synthetic Aperture Radar Interferometry, "GSISAR", was developed. It was designed to process JERS-1 SAR data, which were different from data acquired by former SAR sensors in some points, such as (1) STC (Sensitivity Time Control), (2) not good preci sion in orbit information, (3) spike noise, and (4) L-band . Our research object was to obtain the best possible interferograms in both quality, i.e., coherence, and quantity. One of the ef forts to keep quality of interferograms is, for example, the accurate offset estimation algo rithm, which later enabled us to measure 3-D displacement vectors showing ground defor mation associated with criptdome formation in April, 2000 eruption of Usu volcano. Throughcorrelation study using 45 pairs of JERS-1/SAR interferograms, we confirmed that L-band provided better coherence in vegetated area and smaller temporal decorrelation effects than C-band. Therefore L-band is thought to be suitable for SAR interferometry in vegetated and mountainous land like Japan. For intercomparison of InSAR results, we discussed and organized the theory, equations and definitions of SAR interferometry .
日本測地学会の論文