深空探测巡航段自主光学导航方案研究

星际巡航段导航方案设计是深空探测任务中的重要组成部分.针对巡航段的特点,研究了一种基于多颗小行星光学信息的自主光学导航方案.它包括导航星的确定,导航系统的建立,导航算法的研究.此方案给出了统一的导航小行星选取准则,导航星个数的判别方法,以及基于UD分解的递推加权最小二乘滤波导航算法.通过可观测性分析确保了导航算法的可行性,利用数学仿真验证了导航方案设计的合理性.此方案的导航系统精度优于深空1任务,位置估计误差小于100,速度估计误差小于0.3m/s.

Autonomous Navigation Scheme of Cruise Phase in Deep-space Exploration

In deep space exploration mission,the navigation scheme of the cruise phase is the key technology to research.Based on the special characters,an autonomous optical navigation scheme was provided.It includes how to get the suitable navigation asteroids,how to set up the navigation system,and how to present a successful navigation algorithm.The rules of selecting the asteroids were colligated and form the new criterion.A method to get the reasonable quantity of asteroid of each navigation process was provided.Then a navigation algorithm using the recursive weighted least square based on UD factorization was proposed.The results of simulation show that the navigation scheme is reasonable and the accuracy is better than the DS1 mission.The errors of position are less than 100 km and the errors of velocity are less than 0.3m /s .