摘要
深空探测转移轨道段的自主光学导航一般以小行星作为观测量来源。为了选出可观测的小行星,分析了小行星用于导航的限制因素,给出了视星等、太阳相角、视运动、三星概率、探测器与小行星距离和视线夹角等选取标准;然后,为了从多颗可观测小行星中选出最优组合,以提高导航精度,基于滤波误差协方差分析,给出了一种可量化的选取最优小行星组合的方法,该方法只与小行星到探测器距离和视线夹角有关;最后,参照"深空一号"飞行方案进行了仿真验证。分析和仿真结果表明该方法可有效提高导航精度。
Autonomous optical navigation is an important technology that facilitates the autonomy of the interplanetary space- craft. Methodology for the selection of the beacon asteroids, the sources of observables, is an important portion of the autonomous optical navigation. There are several criteria for the selection, such as magnitude, solar angle, apparent motion, star density, dis- tance and LOS （Ling Of Sight） angle. In order to obtain the best combined navigation accuracy, based on error covariance analysis, a selection method is proposed for the optimal subset of asteroid. This method was demonstrated with Simulation, according to the trajectory scheme of “Deep Space 1”. Analysis and simulation results indicate that the algorithm is simple and the navigation accuracy is improved.
出处
《宇航学报》
EI
CAS
CSCD
北大核心
2009年第3期947-952,共6页
Journal of Astronautics
基金
863计划项目(2004AA735063
2008AA12A203)
国防基础科研项目(A0320080019)
关键词
自主光学导航
小行星
深空探测
协方差分析
Autonomous optical navigation
Asteroid
Interplanetary exploration
Covariance analysis
