由星载GPS相位数据确定地球重力场模型若干问题研究

On earth gravity model determination from GPS phase data onboard satellite

人造地球卫星在地球引力场中运动,可以探测地球重力场的长波信息。随着GPS技术的发展,星载GPS技术日趋成熟,因此由星载GPS相位数据确定地球重力场模型是当前国际地学研究的热点之一。本文给出了确定地球重力场模型中的星载GPS星地相位双差观测量,阐述了Cowell II数值轨道积分公式,导出了参数估计中星地双差观测量的偏导数,利用分块Bayes最小二乘参数估计地球引力场位系数等有关参数。

Artificial earth satellites which can be used to detect the longwave information of earth gravity, move in the earth gravitational field. With the development of GPS technology, onboard GPS technique can be used to determine the satellite orbit. Therefore the study of earth gravity model determination from onboard GPS phase data becomes a research focus in the international geoscience. The satelliteground double differential observation of onboard GPS is given to determine the earth gravity model in the paper. Then Cowell II numerical orbit integration is introduced and the partial derivatives of satelliteground double differential observation are concluded. All parameters including the potential coefficients of earth gravitational field can be estimated with the partitioned Bayesian least squares estimation.