Abstract:

Gravity measurement is of great importance for 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 earth tide correction,ocean tide correction,polar motion correction and atmospheric correction,and the RMS is within ±3×10-8ms-2.The vertical and horizontal gravity gradients were measured using 2 LaCoaste & Romberg(LCR) gravimeters.The absolute gravity measurement provides 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.