动量轮卸载对“天问一号”环火轨道影响分析  

The Effect of Wheel Off-Loading on the Orbit of Tianwen-1

作　　者：孔静[1,2] 张宇 陈明[1,2] 段建锋 李翠兰[1,2] KONG Jing;ZHANG Yu;CHEN Ming;DUAN Jianfeng;LI Cuilan(Beijing Aerospace Control Center,Beijing 100094,China;Science and Technology on Aerospace Flight Dynamics Laboratory,Beijing 100094,China)

机构地区：[1]北京航天飞行控制中心,北京100094 [2]航天飞行动力学技术重点实验室,北京100094

出　　处：《深空探测学报（中英文）》2024年第4期414-420,共7页Journal Of Deep Space Exploration

基　　金：近地小天体的地基雷达天文观测研究和轨道改进技术资助项目(11973015)。

摘　　要：针对“天问一号”动量轮频繁喷气卸载对环火轨道的扰动问题,定性分析了动量轮卸载的摄动量级以及对环火段轨道的影响,在RTN(Radial Transverse Normal)坐标系下建立匀加速模型描述动量轮卸载产生的加速度,对环火中继段和遥感使命段分别采用2种策略计算分析,评估了不同飞行阶段的定轨预报精度。结果表明:频繁的动量轮卸载是影响环火段定轨精度的主要误差因素,目前条件下中继段定轨的位置精度为约150 m,在卸载更为频繁的遥感使命段,位置精度下降至约700 m。In view of the disturbance of the frequent Wheel Off-Loading(WOL)of Tianwen-1,firstly,this paper analysed the perturbation magnitude of WOL and the effect on the orbit in its relay and remote sensing orbits.Secondly,a uniform acceleration model in RTN coordinate system was established to describe the acceleration produced by WOL events,several strategies were proposed to analyze the orbit of the relay and remote sensing orbit respectively,and finally orbital accuracy was assessed by overlap comparison.The results show that WOL events are the main error,affecting orbital accuracy.The position accuracy of the relay orbit is about 150 m,and in the remote sensing orbit where the unloading events are more frequent,the position accuracy decreases to 700 m.

关 键 词：天问一号 动量轮卸载 轨道计算 精度分析 

分 类 号：V412.41[航空宇航科学与技术—航空宇航推进理论与工程]