Исследование точности глобальных моделей геопотенциала EGM2008, EIGEN-6C4, GECO, SGG-UGM-1, SGG-UGM-2, XGM2019 на территории Российской Федерации

Abstract

The improvement of the gravimetric knowledge of the Russian Federation and the creation of new models of the Earth's gravitational field (EGF) in the form of spherical harmonics of the geopotential set the task of choosing the most suitable model based on the characteristics of the gravitational field on the territory of Russia. The satellite gravity missions CHAMP, GRACE and GOCE provide a homoge-neous and almost complete global coverage of information about the Earth's gravitational field. The paper presents the results of a study of the accuracy of modern high-degree global geopotential models for determining various characteristics of the Earth's gravitational field on the territory of the Russian Federation. The models EGM2008, EIGEN-6C4, GECO, SGG-UGM-1, SGG-UGM-2 and XGM2019 were used as the tested geopotential models. The results of the study are presented in the form of statistical parameters and histograms of the distribution of differences g between the gravity values obtained from ground-based gravimetric measurements and calculated from model data. The high-degree model EIGEN-6C4 has a smaller standard deviation ( = 5,24 mGal) compared to other geopotential models. Based on the distribution of differences, we can conclude that the EIGEN 6C4 model is the most suitable for the territory of the Russian Federation.