China successfully broke through the core technology of satellite gravity measurement data processing and analysis

[ China Instrument Network Instrument Development ] Recently, the State Key Laboratory of Geodesy and Geodynamics, Institute of Geodesy and Geophysics, Chinese Academy of Sciences, "New Theory and Technology of Geodetic Precision Detection", the innovative task team and "satellite geodesy and global change" The research team has made significant progress in the development of high-precision time-varying gravitational field products and the development of software systems.

Comparison of IGG Time-varying Gravity Field Model with International Similar Products

Satellite gravity measurement is a technique for satellite measurement of the gravitational field and its changes caused by the mass distribution and migration of the Earth. Because the surface mass migration will cause the earth's gravitational field to change, and the change of the Earth's gravitational field will cause the distance between the two gravitational satellites to change each other. Therefore, by measuring the change of the distance between the two gravitational satellites, it can be reversed. Perform changes in the Earth's gravitational field and mass migration of the Earth's surface.

The research team members of the State Key Laboratory of Geodesy and Geodynamics, Institute of Geodesy and Geophysics, Chinese Academy of Sciences have successfully overcome the key core technologies of GRACE satellite gravity measurement data processing and analysis, and obtain high-precision time-varying gravity field products through inversion (IGG). ), to enable China to achieve independence in the processing and application of gravity satellite data.

According to reports, the series of high-precision time-varying gravitational field products are comparable to similar products of the University of Texas Space Research Center, the US Jet Propulsion Laboratory and the German Geoscience Center.

At present, IGG series time-varying gravity field products have been released to users around the world. In the research and development of related software systems, the research team independently developed the GSOFT_S gravity field inversion software system and the GRAMAT satellite gravity application software system with independent intellectual property rights. Related software copyrights.

In our country, satellite gravity measurements are carried out by two satellites more than 400 kilometers from the surface of the Earth. The two satellites are similar in size to the car, more than 200 kilometers apart, and the measurement error is only one percent of the diameter of the human hair. Up to now, researchers from the Institute of Geodesy and Geophysics of the Chinese Academy of Sciences have used satellite gravity measurements to monitor groundwater in North China and Northeast China, and have obtained a series of important findings.

The breakthrough of this research has realized the independent autonomy of gravity satellite data processing and application, and has important reference significance for the simulation of next-generation gravity satellite program, regional water resources management and utilization and related geodynamics research.

(Source: Xinhuanet, Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Baidu Encyclopedia)