A target star attitude stabilization method using tethers and connecting rods in dragging orbit

Abstract

The invention relates to a target star posture stabilizing method using a tether / connection rod in drag orbital transfer. The tether tension and a connection rod swing coordination control technology are used to stabilize a non-cooperative target posture. The design of the connection rod swing angular rate control law can eliminate the angular velocity of a target body in the direction perpendicular to a tether, which avoids the occurrence of winding. Compared with the plane motion control policy of a tether connection point, the connection rod swing has a larger operation space and can provide a greater control torque. Compared with the PD control law of the connection rod swing angle, the fact that a sliding mode angular rate controller of tension disturbance and swing angle constraint has stronger robustness and better practicability is considered. The design of the tether retraction control law can stabilize tension in the vicinity of a constant expected value. Compared with simple target body stabilizing through tension control, the control of a tension tracking constant value can be easily realized in an actual project and has high stability. In addition, the tension control can maintain the space between spacecraft on both ends to avoid collision.

Description

technical field [0001] The invention belongs to the research on the maneuvering orbit change of a tethered spacecraft, and relates to a method for stabilizing the attitude of a target star by using a tether / connecting rod in the dragging orbit change. Background technique [0002] The dragging and removal of orbital debris using space tethered robots has attracted much attention due to its high flexibility and high safety. [0003] Before dragging and removing, the space platform will release the tethered intelligent flying claws to capture the out-of-control non-cooperative targets. Since the non-cooperative target is in an unstable state and has residual angular velocity, the orientation of the tether tension relative to the target body after capture depends on the target body posture at that time. In addition, the capture position is also likely not to be on the principal axis of inertia of the target body. This means that in the subsequent dragging, the biased tether t...

AI Technical Summary

Problems solved by technology

Once entangled, the tether tension surges and pulls the two spacecraft toward each other increasing the risk of a collision

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