【摘要】 针对激光星间链路终端指向误差在轨标定中航天器姿态测量误差影响标定结果的问题,本文提出了基于多链路测量的航天器姿态测量误差分离方法。该方法利用了导航星座中同一航天器同时建立多条链路的特点,获取不同方向的LCT指向误差测量数据。通过同时估计航天器姿态测量误差与LCT自身指向误差参数,实现了航天器姿态测量误差与LCT自身指向误差的分离。仿真结果表明:航天器姿态测量误差对LCT指向误差标定结果有显著影响,利用本方法进行误差分离后,LCT指向误差标定结果最大偏差由分离前的64. 9μrad下降到误差分离(6条链路)后的21. 1μrad,有效降低了航天器姿态测量误差对LCT指向误差标定结果的影响。该方法的有效性取决于链路条数和链路拓扑构型。更多还原

【Abstract】 The in-orbit calibration accuracy of the LCT pointing error is corrupted by the spacecraft ’s attitude measurement errors. A method using measurements from multiple inter-satellite links to the separation of the spacecraft’s attitude measurement errors is proposed. The measurement data of the LCT pointing errors are acquired from multiple directions corresponding to the inter-satellite links established in navigation constellation. The spacecraft ’s attitude measurement errors and LCT pointing error parameters are estimated simultaneously utilizing those measurements. The simulation results show that the calibration accuracy of the LCT pointing error is severely affected by the spacecraft’s attitude measurement errors. While applying parameters estimation with this method,the maximal error of the resulting estimated pointing error parameters is reduced from 64. 9 μrad to 21. 1 μrad( with 6 links),demonstrating the validity of this error separation method. It also shows the accuracy of this method is dominated by the number and the topology of the inter-satellite links observed.更多还原