利用平均加速度法恢复GOCE地球重力场模型  

GOCE GRAVITY FIELD MODELING BY USING AVERAGE ACCELERATION APPROACH

作　　者：苏勇[1] 范东明[1] 贺全兵[1] 

机构地区：[1]西南交通大学地球科学与环境工程学院,成都610031

出　　处：《大地测量与地球动力学》2013年第6期24-27,共4页Journal of Geodesy and Geodynamics

基　　金：中央高校基本科研业务费专项资金(SWJTU12BR012)

摘　　要：将非保守力残余加速度参数作为未知参数与位系数整体求解，利用GOCE卫星2009—11-01--2010-01—31日的精密轨道数据，基于平均加速度法恢复了120阶次的重力场模型GOCE—AAA01S。结果表明：利用12阶多项式解算的模型精度最高，并且阶数的增加或减少均会降低恢复的重力场模型的精度；在120阶次的大地水准面误差约为±6．8em，在6～120阶次内GOCE—AAA01S的精度优于EIGEN．CHAMP03S，在102阶次以后GOCE—AAA01S的精度低于EGM96。文中未考虑极空白的影响，所恢复的重力场模型位系数的带谐项精度偏低。The average acceleration approach does not require any initial information of unknown parameters, and does not need interpolation or differential of orbits, which is more rigorous than point-wise acceleration ap- proach. The parameters of the residual acceleration are unified to solve with coefficients when gravity field modeling by using the average acceleration approach. A gravity field model, which named GOCE-AAA01S, is recovered based on GOCE precision orbits of days from 2009-11-01 to 2010-01-31 with the average acceleration approach. The results show that the gravity field model with the best accuracy is recovered by 12-order polynomial and the ac- curacy of the recovered gravity field model will reduced when the order increases or decreases of polynomial. The geoid error of the model GOCE-AAA01S is ＋6.8 cm with 120-order, the accuracy of the model GOCE-AAA01S is higher than the model EIGEN-CHAMP05S with 6 to 120 order, but lower than the model EGM96 with the order o- ver 102, and the precision of zonal coefficients is low due to the polar gap.

关 键 词：平均加速度法 GOCE卫星 地球重力场模型 位系数 大地水准面误差 

分 类 号：P223[天文地球—大地测量学与测量工程]