基于强跟踪器的机动航天器相对动态定位算法

针对机动航天器之间精确动态相对定位问题,提出一种基于强跟踪器(strong tracking filter, STF)的动态相对定位算法。该算法针对相对机动过程中3个方向的机动特性,设置三向渐消因子进行三向滤波,克服了单向渐消因子与实际机动不匹配而造成的跟踪精度下降问题, 针对三向滤波在直角坐标系下的跟踪问题,设置去偏转换测量算法,克服了球坐标系与直角坐标系的转换偏差问题。仿真实验表明,该算法在初值敏感性和相对机动恢复性上均强于其他算法,适用于脉冲推力、有限推力等多种情况下机动航天器间精确动态相对定位。

Dynamic relative positioning algorithm for maneuvering spacecraft based on strong tracking filter

For the problem of precise dynamic relative positioning between maneuvering spacecraft, a dynamic relative positioning algorithm based on the strong tracking filter(STF) is proposed. In consideration of the difference among the three directions in relative maneuvering, a three directions filter is set up to avoid the decline of tracking accuracy due to the un match between the one direction filter and the actual maneuver. For the tracking problem of the three directions filter under the Cartesian coordinate system, the converted measurement algorithm is presented, to overcome the deviation problem in the spherical coordinate system and Cartesian coordinate system conversion. Through simulation and analysis, it shows that, the algorithm is better than the other algorithms on initial value sensitivity and relative maneuvering recovery, and is suitable for spacecraft dynamic relative precise positioning in a variety of circumstances such as pulse thrust maneuvering, limited thrust maneuvering and so on.