基于GNSS网的PS InSAR基线网形变基准标定及三维形变信息融合方法研究

PS (permanent scatter, PS) InSAR technique has broad application prospects in geodesy, engineering surveying, monitoring the Earth changes, the Earth system science, and so on. The current existing problems, including how to obtain global or large-scale area deformation monitoring based on a uniform deformation datum, and how to establish a rigorous adjustment model for fusing the deformation from InSAR and that from GNSS, needs to be further studied to extend the application of this technique in establishing there-dimensional large-scale deformation model of high precision. This project use a subset of stable PSs as the local ties between the GNSS geodetic network and PS base-line network, to explore the theory and method for monitoring the large-scale deformation. Key points of this project is composed of the following three parts: (1)The PSs are classified by the stability analysis by using the combination of InSAR time series and the time series of GNSS continuously operating reference stations (CORS), and then the stable subset of PSs are calibrated by the GNSS deformation to define the uniform deformation datum for realizing large-scale and even global deformation monitoring; (2) Using the calibrated PSs with prior deformation information, the baseline processing and network adjustment will be studied to control the remaining atmospheric error; (3) Integrating the InSAR deformation with the GNSS/level deformation, the rigorously adaptive information fusion model will be proposed for establishing the three-dimensional deformation model. The research results can provide a novel scheme to economically and effectively realize the Earth surface monitoring of high precision and reliability.

PS InSAR（永久散射体InSAR）技术在大地测量、工程测量、地球变化监测、地球系统科学等领域具有巨大的应用前景。目前全球或大范围InSAR形变基准的统一问题，以及GNSS形变监测与PS InSAR形变监测信息的严密融合问题，还未能很好地解决，这在一定程度上限制了PS InSAR技术用于大范围、高精度三维形变监测。本项目以PS InSAR自然/人造永久散射体的稳定子集为“连接”，研究GNSS监测网和PS基线网联合监测大区域形变的理论和方法。研究GNSS连续基准站时序的PS点稳定性分级与基准标定，实现PS InSAR大范围甚至全球地表变化监测的基准统一；基于标定后的PS稳定点集，研究附加先验信息的PS基线解算与网平差，互补GNSS/水准观测和InSAR技术优势，研究InSAR联合多源大地测量观测构建三维形变场模型的严密自适应信息融合模型。

PS InSAR技术在大地测量、工程测量、地球变化监测、地球系统科学等领域具有巨大的应用前景。目前全球或大范围InSAR形变基准的统一问题，以及GNSS形变监测与PS InSAR形变监测信息的严密融合问题，还未能很好地解决，这在一定程度上限制了PSInSAR技术用于大范围、高精度三维形变监测。本项目以PS InSAR自然/人造永久散射体的稳定子集为“连接”，研究GNSS监测网和PS基线网联合监测大区域形变的理论和方法。互补GNSS和InSAR技术优势，研究InSAR联合多源大地测量观测构建三维形变场模型的方法，一方面探讨两者时间序列结果分析，一方面验证了GNSS用于InSAR大气改正的可行性。.本项目收集了研究区域内（北京城区）同期的Terra SAR卫星影像以及GNSS观测数据，通过PS InSAR数据处理获得了研究区域内65000个PS点的形变时间序列结果，对影像范围内的基准站观测数据进行了处理分析，获得同期GNSS基准站形变时间序列。对两者形变时间序列进行同步分析，求得PS点位与GNSS基准站形变时间序列的相关关系，并获得研究区域内三维形变结果，进行典型区域形变结果分析。.同时选取基准站密集、而且受到水汽影响较大的南加州区域，进行以GNSS基准站水汽对InSAR大气进行改正的实验分析，验证了GNSS基准站进行大气改正的可行性和有效性，加强了GNSS连续观测数据和影像结合的密切关系。.通过InSAR自然/人造永久散射体作为“桥梁”，研究GNSS地面监测网和PS基线网联合监测形变的理论和方法，构建了研究区域三维形变场，分析各类典型区域的形变时间序列。