Time Series Extracting of Ground Deformation by Short Spatio-Temporal Baseline PS-DInSAR
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摘要: 为减小合成孔径雷达差分干涉技术中时空失相关对区域地表形变探测的影响,采用同时限制时间和空间基线的方式自由组合干涉对,基于永久散射体构建差分网络模型以提取区域形变,并利用奇异值分解方法恢复其时间序列.为验证算法的有效性,以美国Phoenix市为试验区域,采用39幅ERS-1/2卫星C波段SAR图像(时间跨度为1992~2000年)进行地表沉降探测.结果表明,该算法能有效提取区域地表沉降的时间序列.
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关键词:
- 永久散射体 /
- 合成孔径雷达差分干涉 /
- 短时空基线 /
- 奇异值分解
Abstract: In order to decrease the negative effects of spatio-temporal decorrelation in differential synthetic aperture radar interferometry(DInSAR),a method for analyzing the time series of ground deformation with a network formed by connecting adjacent permanent scatters(PSs) was proposed.With this method,interferometric combination is formed by considering both temporal-and spatial-baseline threshold,linear and non-linear motions can be extracted and separated from the PS-networking model,and the entire time series of ground deformation can be reconstructed by the singular value decomposition.An experiment was performed using 39 ERS-1/2 C-band SAR images,acquired from 1992 to 2000,related to the Phoenix region of the United States.The experimental results show that the proposed method is feasible and effective. -
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