一种重力测量卫星静电加速度计在轨标定算法  

On-orbit Calibration Algorithm of Electrostatic Accelerometer for Gravity Measurement Satellite

作　　者：辛宁[1] 邱乐德[1] 张立华[2] 刘乃金[1] 

机构地区：[1]中国空间技术研究院通信卫星事业部,北京100094 [2]航天东方红卫星有限公司,北京100094

出　　处：《航天器工程》2016年第1期25-30,共6页Spacecraft Engineering

基　　金：国家自然科学基金(91438205)资助项目

摘　　要：静电加速度计是低低跟踪(SST-LL)重力测量卫星的关键载荷之一,其性能直接影响地球重力场空间变化率的测定结果。为了确保静电加速度计长期在轨工作,结合扩展卡尔曼滤波估计算法,提出了一种应用动力学方法确定静电加速度计校准参数的算法。首先建立静电加速度计及K频段测距(KBR)系统的量测模型;然后将高精度地球重力场模型和静电加速度计观测数据代入扩展卡尔曼滤波算法的状态方程中,将KBR系统观测数据代入观测方程中,建立静电加速度计在轨标定模型。数学仿真结果表明:静电加速度计的标度因子和零偏估计误差均在0.2%以内,实现了卫星静电加速度计较为精确的标定。The electrostatic accelerometer is one of the most important instruments of the SST-LL （low-low satellite-satellite tracing） gravity measurement satellite which directly affects the mea- surement of the earth gravity field. In order to ensure long-term on-orbit working of electrostatic aecelerometer and in combination with extended Kalman filter, a calibration algorithm based on dynamics is proposed for the accelerometer. Firstly,the observation model of the electrostatic ae- celerometer and KBR （K band ranging） system are obtained. Then, the accurate gravitational model and the measurements of electrostatic accelerometer are fitted into KBR-based extended Kalman algorithm. The associated simulation is performed to verify the availability and feasibility of the proposed calibration algorithm. The calibration accuracy of scale factors and biases can be better than 0. 2 %, which achieves the accurate calibration of satellite electrostatic accelerometer.

关 键 词：重力测量卫星 静电加速度计 K频段测距系统 在轨标定 

分 类 号：V447[航空宇航科学与技术—飞行器设计]