绕月探测器的自主光学导航研究

 提出了一种利用高斯-马尔科夫过程和Unscented卡尔曼滤波的绕月探测器自主光学导航算法。针对很难事先确定精确地绕月探测器轨道动力学模型问题,提出利用高斯-马尔科夫过程来近似轨道动力学中的无模型加速度,进而提高了轨道动力学模型的精度;考虑到基于扩展卡尔曼滤波的轨道确定存在的问题,提出利用基于Unscented卡尔曼滤波来估计探测器的位置、速度及无模型加速度,提高了轨道估计精度和保证了算法的稳定性。最后,通过数学仿真验证了自主光学导航算法的有效性。

Autonomous Optical Navigation for Spacecraft Around Moon

The autonomous optical navigation algorithm for spacecraft around Moon using the Gauss-Markov process and Unscented Kalman filter is presented.For the problems arising from the absence of exact orbit dy- namics models of spacecraft around Moon,the un-modeled acceleration of orbit dynamics is approximated by u- sing the Gauss-Markov process in order to improve the precision of orbit dynamics.Considering the problems of orbit determination algorithm based on extended Kalman filter,the position,and velocity of spacecraft and the un-modeled acceleration are estimated by using the Unscented Kalman filter to improve the precision of or- bit estimation and ensure the stability of algorithm.And the autonomous optical navigation algorithm is valida- ted using the numerical simulation.