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The absolute gravity measurement by FG5 gravimeter at Great Wall Station,Antarctica
Shengkai Zhang, Gang Chen, Zhitang He, Zemin Wang, Yang Yuande, Shiwei Zhang
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Abstract
Gravity measurement is of great importance to the height datum in Antarctica. The absolute gravity measurement was carried out at Great Wall Station, Antarctica, using FG5 absolute gravity instrument. The gravity data was processed with corrections of earth tide, ocean tide, polar motion and the atmospher, and the RMS is within ±3×10 -8 ms -2 . The vertical and horizontal gravity gradients were measured using 2 LaCoaste & Romberg (LCR) gravimeters. The absolute gravity measurement provides the fundamental data for the validation and calibration of the satellite gravity projects such as CHAMP, GRACE and GOCE, and for the high accuracy geoid model.