CRInSAR与PSInSAR融合探测地表线性变形速率

Study on Ground Deformation Monitoring Simulation Based on Combined CRInSAR and PSInSAR Calculation

提出利用CRInSAR与PSInSAR融合解算地表变形参数的算法。将CR点上获取的线性变形速率与高程改正结果作为PS基线网络的起算数据,依据最小二乘原理求解PS点上待求线性变形速率与高程改正值的最优解。这一算法可融合PSInSAR与CRInSAR两种算法的优势,起到很好的互补作用。实验显示,这一算法获取的线性变形速率精度可达±0.37mm/a,高程改正值精度可达±0.5m,证实该算法在实际地表变形监测中具备可行性。

The paper presents an algorithm for the combined calculation of the corner reflector interferometric synthetic aperture radar （CRInSAR） and the permanent scatters interferometric synthetic aperture radar （PSInSAR） techniques. The algorithm uses the subsidence rates and elevation corrections calculated on the CR points as initial data for the PS baseline network. It then estimates the total optimum solutions of linear deformation rates and elevation corrections through the parametric adjustment method in the PS network. Ex- periments with simulated data and real data are carried out to estimate the feasibility of the algorithm. The simulation results show that the accuracy of linear deformation rates is ±0.37 mm/a, while that of elevation correction is ±0.5 m. The PS deformation rates inversed through the real data experiment show good consistency with that of leveling deformation monitoring. It can be inferred that the method presented is feasible in field regional deformation monitoring.