【摘要】 水汽延迟是InSAR技术的重要误差源,已成为高精度差分干涉测量的主要限制.本文比较分析了GPS与MERIS可降水量反演结果以及水汽变化量探测结果,研究发现两者探测到的水汽含量和水汽变化量均存在较好一致性.在此基础上,以南加州地区为例验证了差分MERIS PWV用于同步ASAR干涉图水汽改正的可行性,经过水汽改正干涉图质量提高了约23%,并进一步对比了InSAR形变监测结果与GPS探测到的形变,比较结果表明,消除水汽影响后干涉图形变结果可靠性提高了19%.更多还原

【Abstract】 he accuracy of interferometric synthetic aperture radar is limited by the effects of atmospheric water vapor.The precipitable water vapor(PWV) and the differencial PWV retrieved from GPS observation and MERIS are compared in this paper.The results show that both the PWV and differencial PWV from GPS and MERIS have a very good consistency.On this basis,a case study of applying MERIS PWV to correct ASAR interferogram over Southern California is given.The standard deviation(STD) of interferogram is improved by 23% after the water vapor correction.Then the comparison of the deformation results from uncorrected/corrected interferograms with GPS observation verified the effectiveness of the correction,and the dependability of InSAR results is improved by 19%.更多还原