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应用永久散射体雷达干涉(PSI)技术进行地表沉降监测研究,对PSI建模时采用的各相位分量的空间相关特性和沉降结果精度进行详细分析。试验选取覆盖上海地区的16幅高分辨率TerraSAR-X(TSX)SAR影像为数据源,进行PSI建模、形变提取和精度分析,并使用地面水准数据进行对比验证。结果表明,根据PS各相位分量的空间相关特性进行PS点的识别是合理的。与水准数据对比,两类年沉降速率结果具有很好的一致性,差异均值和标准偏差分别为1.6 mm/a和±4.6 mm/a,最小和最大差异量分别为0.198 7 mm/a和10.132 mm/a,证实了PSI技术在上海地区地表沉降监测的应用是有效和可靠的。
The application of permanent scatterer radar interferometry (PSI) for surface subsidence monitoring is studied. The spatial correlation characteristics of each phase component and the accuracy of settlement results are analyzed in detail. Sixteen high-resolution TerraSAR-X (TSX) SAR images covering the Shanghai area were selected as data sources for PSI modeling, deformation extraction and accuracy analysis. The ground-level data were used for comparison verification. The results show that it is reasonable to identify PS points according to the spatial correlation of PS phase components. Compared with the standard data, the two types of annual sedimentation rate results have good consistency, the difference mean and standard deviation were 1.6 mm / a and ± 4.6 mm / a, the minimum and maximum differences were 0.198 7 mm / a and 10.132 mm / a, which confirms that the application of PSI in surface subsidence monitoring in Shanghai is effective and reliable.