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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。
Aiming at the problem of precise dynamic relative positioning between mobile spacecraft, a dynamic relative positioning algorithm based on strong tracking filter (STF) is proposed. The algorithm aims at the maneuvering characteristics of three directions in the maneuvering process by setting the three-direction fading factor to three-directional filtering, which overcomes the problem of the tracking accuracy decreasing caused by the one-way fading factor mismatching with the actual maneuver. Cartesian coordinate system of tracking problems, set to the deflection measurement algorithm, to overcome the spherical coordinate system and rectangular coordinate system conversion deviation problem. Simulation results show that the proposed algorithm is superior to other algorithms in initial sensitivity and relative maneuver recovery, and is suitable for accurate dynamic relative positioning of maneuver spacecraft under various conditions, such as impulse thrust and finite thrust.