一种基于视线矢量的双星系统自主导航方法研究

Autonomous Navigation Method Research of Two Spacecraft System Based on Relative Line of Sight Vector

研究了近地绕飞双星系统的自主定轨问题,设计了一种基于相对视线矢量测量的自主导航方法。本方法利用导航相机观测双星之间的相对视线矢量,并转化为相机坐标系下的像元像线,从而得到导航系统的量测模型;然后结合卫星的轨道动力学方程,通过扩展卡尔曼滤波算法精确估计双星在地心惯性系下的位置和速度共12个分量。最后,通过数学仿真验证了此导航方法的可行性。

Autonomous orbit determination of two satellites system in near earth orbit was considered based on the relative line-of-sight vector measurements between two satellites. In this program, the relative line-of-sight vector between the two satellites was obtained by the navigation camera on board,＂ then, the vector was converted into the pixel and line in the camera coordinates, which is the measurement model in the navigation system. After that, the orbit states including position and velocity of satellites of a total of twelve components in inertial frame were achieved accurately through the extended Kalman filter arithmetic with the combination of the orbit dynamical equations. The feasibility of this method has been demonstrated by numerical simulations.