ESTABLISHMENT OF HARMONIC ANALYSIS MODELS OFSINGLE COMPONENT AND COMPOSITE COMPONENTSOF DISTURBED GRAVITY GRADIENT TENSOR
Liu Xiaogang 1,2) ;Zhang Liping 1) ;Wang Jun 3) ; and Pu Tingting 3)
1)Xi’an Research Institute of Surveying and Mapping, Xi’an 710054;2)National Key Laboratory of GeoInformation Engineering,Xi’an 710054;3)78155 Troops of PLA，Chengdu 610062
Abstract The harmonic analysis model of single component Tzz and composite components Txx+Tyy,Tzz-Txx-Tyy of disturbed gravity gradient tensor to compute the Earth’s gravitational field model(EGM) are deduced. The influences of disturbed gravity gradient data in different resolutions and with different errors on the accuracy of EGM are analyzed.Thus, the models established here are validated with simulated data. Results show that the harmonic analysis method could not recover the EGM completely because of the influence of continuation and gridding errors as well as the indetermination of smoothness factor. The effective degree and accuracy of EGM are gradually falling along with the increase of errors. The accuracy of EGM computed by composite components Tzz-Txx-Tyy is the highest while that of the composite components Txx+Tyy is the lowest.
Liu Xiaogang,Zhang Liping ,Wang Jun et al. ESTABLISHMENT OF HARMONIC ANALYSIS MODELS OFSINGLE COMPONENT AND COMPOSITE COMPONENTSOF DISTURBED GRAVITY GRADIENT TENSOR[J]. , 2012, 32(5): 103-107.
Liu Xiaogang,Zhang Liping ,Wang Jun et al. ESTABLISHMENT OF HARMONIC ANALYSIS MODELS OFSINGLE COMPONENT AND COMPOSITE COMPONENTSOF DISTURBED GRAVITY GRADIENT TENSOR[J]. jgg, 2012, 32(5): 103-107.
