利用卫星轨迹交叉点标定CHAMP卫星加速度计数据

基于能量守恒方程给出了利用卫星轨迹交叉点标定CHAMP卫星加速度数据的基本原理和方法 ,并给出了其严密的积分公式及其离散化形式。为了控制加速度数据的扰动异常 ,建议采用抗差估计求解参数值 ,并基于实测的CHAMP卫星加速度计数据进行了计算与比较 ,验证了该方法的有效性

Calibration for CHAMP Accelerometer Data Based on Crossover Points of the Satellite

The German Challeging Minisatellite Payload(CHAMP) was launched in July 2000. It is the first satellite that provides us with position and accelerometer measurements, with which the gravity field model can be determinated. One of the most popular method for geopotential recovery using the position and accelerometer measurements is the energy conservation method. The main aim of this paper is to determinate the scale and bias parameters of CHAMP accelerometer data using the energy conservation method. The basic principle and mathematical model using the crossover points of CHAMP orbit to calibrate the accelerometry data are given based on the energy balance method. The rigorous integral formula as well as its discrete form of the observational equation is presented. This method can be used to estimate only one of the scale and bias parameters or both of them. In order to control the influence of outliers, the robust estimator for the calibration parameters is given.