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EFFECT OF HIGH-FREQUENCY TEMPORAL ALIASING ON GOCE GRAVITY FIELD SOLUTION

Dr. C.K. Shum(1), Dr. Alexander Braun(2) , Dr. Shin-Chan Han(1) , and Mr. Chung-yen Kuo(1)

(1) Laboratory for Space Geodesy and Remote Sensing, 2070 Neil Ave., Columbus, OH 43210, USA, Columbus, OH 43210, United States
(2) Byrd Polar Research Center, 1090 Carmack Rd, Scott Hall, Columbus, OH43210, US, Columbus, OH 43210, United States

Abstract

European Space Agency's GOCE space gradiometer mission is anticipated to produce the mean gravity field model of the Earth with an unprecedented geoid accuracy of 1 cm rms with wavelength at 160 km or longer. In a sun-synchronous near-polar orbit and at an orbital altitude of 200 km, GOCE senses more than mean gravitational forces including tides and other temporal gravity field signals, including gravitational perturbation due to atmospheric loading on solid Earth and ocean. In this study, we investigate the effect of high-frequency temporal gravity field errors or signals from ocean tides, atmosphere, hydrological, ocean and continental ice sheets, on the accurate estimation of GOCE Level 2 product of the geopotential model complete to degree 180. In particular, in addition to errors from temporal gravity field models, due to the orbital sampling characteristics, the effect of temporal aliasing could be critical to the recovery of the GOCE mean gravity field. We will conduct a simulation study with the objectives to quantify the temporal aliasing and model errors using current temporal gravity field models.

 

Full paper

Keywords: ESA European Space Agency - Agence spatiale europeenne, observation de la terre, earth observation, satellite remote sensing, teledetection, geophysique, altimetrie, radar, chimique atmospherique, geophysics, altimetry, radar, atmospheric chemistry

GOCE04