【摘要】 针对月球探测器自主导航定位问题,研究了一种基于掩星测量的自主天文导航方法。利用星敏感器测量恒星被月球遮挡或从遮挡状态中再现的时刻,并将时间观测量转化为沿恒星星光方向上的距月心最低高度信息,结合月球探测器的动力学模型,建立了基于卡尔曼滤波的掩星观测自主天文导航算法。为实现对掩星现象的及时观测,推导了掩星现象预测算法。数学仿真结果表明,月球探测器掩星自主天文导航原理可行,定位精度优于百米量级。更多还原

【Abstract】 A method by using star occultation is presented to fulfill the autonomous navigation for lunar probe. Firstly,the times,when stars suddenly appear or disappear without crossing the edge of the field of view,are measured by using a star sensor. Firstly,the times are transferred into the minimum distances between the moon center and the sight vectors from the probe to stars,then,state equations based on the moon probe’dynamics is established and measurement equations of autonomous navigtion by using star occultation is presented. In order to measure the star occultation information in time,the forcasting model of star occultation time is derived. Finally,the reference conclusions are obtained and analyzed according to the simulation results.更多还原