Torus approach in high degree gravity field model determination from GOCE satellite gradiometry observations

doi:10.11947/j.AGCS.2020.20200044

Abstract

Abstract: Currently, space-wise method, time-wise method and direct-wise method are widely used to deal with the GOCE satellite real observations. Different from these conventional methods, this paper proposes one Torus approach. As one refinement of the reference model, the GOCE earth gravity field model complete to 200 d/o is recovered using 71-day GOCE satellite gradiometry observations with Torus approach. Firstly, a Butterworth filter with zero-phase combining with remove-restore is used to deal with the colored noise in GOCE satellite gravitational gradient observations. These observations are reduced from the real orbits to nominal orbits using Taylor series expansion and Kriging is used for gridding on the nominal orbits. Then, 2D-FFT and the block-diagonal least-square adjustment are performed to process the gridded observations, so that the GOCE earth gravity field model complete to 200 d/o named as GOCE_Torus can be realized efficiently. GOCE_Torus is assessed with the GPS/leveling data in China and USA, respectively. GOCE_Torus and the first generation model released by ESA have a similar accuracy. In USA, EGM2008 complete to 200 d/o reveals a similar accuracy with GOCE_Torus. But in China, GOCE_Torus is improved by 4.6 cm due to the contribution of GOCE gravity gradiometry data. With the application of Torus approach the satellite gravity field model can be recovered quickly and accurately, and therefore this approach is useful in mission design, error analysis and in-orbit evaluation of gravity gradient satellites.

Key words: GOCE, earth's gravity field, Torus approach, refinement

CLC Number:

P223

LIU Huanling, WEN Hanjiang, XU Xinyu, ZHAO Yongqi, CAI Jianqing. Torus approach in high degree gravity field model determination from GOCE satellite gradiometry observations[J]. Acta Geodaetica et Cartographica Sinica, 2020, 49(8): 965-973.

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