基于两步多模型估计的非合作航天器相对导航

Relative Navigation for Non-cooperative Spacecraft Based on Second Step Multiple Model Estimation

对非合作航天器进行相对导航,相对距离测量信息容易受到干扰,测量误差有较大的不确定性,通常的基于单一模型的滤波算法无法对噪声进行辨识,很难获得精确的导航结果。根据导航系统测量敏感器的特点,设计基于方位测量的单一模型滤波和基于距离测量的多模型滤波相结合的两步多模型滤波(second step multiplemodel estimation,STMME)算法,在保证计算效率的前提下,确保相对轨道确定的稳定性和精确性。针对应用Clo-hessy-Wiltshire(C-W)方程受到圆轨道假设的限制问题,研究了利用建立在惯性坐标系下的近距离相对运动方程进行相对导航的可行性。数值仿真验证了算法的有效性和先进性。

For the relative navigation of non-cooperative spacecraft,the disturbing to the relative distance measurement information makes the noise statistics become uncertain.In this case,it is difficult to differentiate the noise and obtain precise navigation estimation results through the single model filtering.According to the character of the navigation sensors,the second step multiple model estimation(STMME) which is the combination of single model estimation for azimuth measurement and multiple model estimatio...