一种海洋测高卫星质心在轨估计算法

Study on On-orbit Estimation of Center of Mass for Ocean Altimetry Satellite

为了满足海洋测高卫星在轨质心位置精度的要求,提出了一种使用陀螺仪测量数据在轨估算卫星质心位置的算法。该算法利用推力器工作产生外力矩,采用总体最小二乘法,综合考虑了实际推力器推力的误差及陀螺仪的测量误差,由卫星的姿态动力学方程估算得到卫星质心位置。数值仿真证明了该算法的有效性,结果表明质心位置的估计精度在毫米量级,可以满足海洋测高卫星对质心位置精度的需求。

A method for on-orbit estimation of center of mass is presented to satisfy the accuracy of center of mass of ocean altimetry satellite,based on the data of gyros in satellite.By utilizing the moment due to thruster firings to change the satellite attitude,the center of mass of satellite can be estimated by using total least squares to solve attitude dynamics equation with taking into account the factor that both forces of thrusters and data of gyros contains errors in practical terms.The simulation demonstrates that the method is effective and the results show that the accuracy of estimation for center of mass is of the order of millimeters.This also proves that the method can satisfy the requirement of center of mass of altimetry satellite.