现代卫星大地测量技术（特别是GRACE/GRACE-FO、GNSS）的发展，为定量监测地表质量变化提供了新契机。本项目以建立更加精细、可靠和连续的区域地表质量变化模型为目标，充分发挥不同技术在反演地表质量变化中互补的优势，深入研究联合GRACE/GRACE-FO L1b数据和GNSS形变数据反演区域地表质量变化的理论方法及关键技术，主要内容包括：GRACE/GRACE-FO、GNSS数据的精细预处理和一致性分析，精细区域地表质量变化的联合反演模型与实用算法，GRACE/GRACE-FO数据空白期地表质量变化的衔接方法，研制具有自主知识产权的区域地表质量变化联合反演软件，并构建典型地区连续精细的地表质量变化模型。预期研究成果不仅对完善卫星大地测量技术反演地表物质迁移的方法具有重要理论意义，同时可为应对水资源短缺、极端气候变化和重大自然灾害等地球物理环境监测问题提供科学依据和技术支持。

The development of modern satellite geodetic technologies, especially GRACE/GRACE-FO and GNSS, provide a new opportunity for quantitative monitoring of the Earth’s surface mass variations. This project aims at determining more refined, reliable and continuous regional surface mass variations by making full use of the complementary advantages of different technologies, and the theoretical methods and key technologies for joint inversion of regional surface mass variations will be systematically studied. Firstly, the refined reprocessing and consistency analysis of GRACE/GRACE-FO L1b data and GNSS deformation data will be deeply investigated. Secondly, the theoretical models and practical algorithms for joint inversion of refined regional surface mass variations will be established. Thirdly, the methods for linking data gaps caused by GRACE/GRACE-FO will be further discussed. Finally, the software system with independent intellectual property rights for joint inversion of regional surface mass variations will be developed, and the continuous and refined surface mass variations models for some typical areas will also be constructed. The anticipated results have important theoretical significance for improving the inversion methods of surface mass transport by satellite geodetic techniques. Moreover, it can provide scientific basis and technical support for coping with the geophysical environmental monitoring issues such as water shortage, extreme climate change and major natural disasters.