多参考点的PS-InSAR变形监测数据处理

摘要

针对永久散射体干涉测量（PS-InSAR）基线网平差数据处理过程中单参考点导致的解不够稳定和不够可靠的问题，提出一种结合地面观测资料的多参考点PS-InSAR数据处理方法，并研究推导了相应的数学模型。该方法在PS基线网处理中引入多参考点参与解算，一方面提高了解算结果的稳定性，另一方面通过增加多余观测方程获取最优参数解，提高了解的可靠性。利用覆盖西安市的13景EnvisatASAR数据以及5个角反射器（CR）、GPS点作为已知参考点，分别获取了单参考点和多参考点下的形变场，通过与4个检核点的比较，表明多参考点结果比单参考点更吻合于地面观测资料。%Single-reference point permanent scatterers interferometry (PS-InSAR) can result in an unstable and unreliable solution in the data processing of baseline network adjustment. This paper advances a multi-reference points PS-InSAR data processing method by adding ground monitoring data and the corresponding mathematic model is derived. By introducing multi-reference points in the PS baseline network processing, the solution~s stability and reliability can be improved due to extra observations condition. In the experiment, thirteenEnvisatASARimages covering theXi~an city and five reference points composing of Corner Reflectors (CR) and GPS are employed to prove the superiority of the proposed method, Processing these data, average surface deformation field from single- reference point and multi-reference points are created respectively. The results of comparing four checking points show that solution from multi-reference points is much more consistent with ground observation result than single-reference point.