自由漂浮空间非合作目标的运动预测.

Motion prediction of space non-cooperative target is an important issue for spacecraft on-orbit service. With obtained high-precision motion prediction results, the chaser can plan its motion trajectory to approach the target and then capture it. A motion prediction method was proposed for free-floating space non-cooperative targets. The core idea of this method is to identify kinematic parameters of the target's mass center and attitude dynamic parameters, and then with dynamic equations for the target to realize the motion prediction. In the identification of the attitude dynamic parameters, inertia parameters of the target were preliminarily identified firstly, then an adaptive unscented Kalman filter (UKF) was used to roughly identify the attitude dynamic parameters, and finally the identification precision was further improved through optimization. In the identification of the kinematic parameters, the parameters were roughly identified firstly with the optimal attitude dynamic parameters obtained above and the kinematic equations for the target's mass center, and then the identification precision was further improved again through optimization. In the end, the effectiveness of the proposed motion prediction method was verified by numerical simulations. Simulation results indicate that, the proposed method can achieve long-time high-precision motion prediction of the non-cooperative target whether the target is in uniaxial rotation or tumbling motion. [ABSTRACT FROM AUTHOR]