Rapid construction of high-precision regional terrain gravity gradient map

Résumé fourni par la source

In recent years, the research on gravity gradient assisted matching inertial navigation has attracted more and more attention from scholars, and one of the key technologies of gravity gradient navigation is the construction of background datum map. The gravity gradient is the second-order guide of gravity, which can more prominently reflect the detailed characteristics of the local area than the gravity anomaly, so it can provide a better auxiliary role for inertial navigation. In this paper, we use the terrain elevation data (DEM) with a resolution of 30m in a certain area in the GDEMV2 file, clip and output a specific range of data through Global Mapper, and use COMSOL to establish a terrain relief model for tetrahedral meshing, and calculate and draw the gravity gradient datum map of the 30m×30m grid from the partitioned mesh data. Therefore, it is not necessary to pursue a high number of partition models and spend too much time. The accuracy of the Laplace equation satisfies by Vxx and Vyy and Vzz is 10-22s-2, and the calculation speed of the proposed method is greatly improved compared with the calculation results of the prismatic method at the same resolution.

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