Design of collision avoidance strategies based on phase modulation mechanism for spacecraft in circular orbit
This paper proposed a collision avoidance maneuver strategy using a continuous thrust phasing mechanism for spacecraft equipped with low-thrust propulsion systems,such as electric propulsion.Firstly,the spacecraft collision probability based on the uncertainty of the initial state using chaotic polynomial expansion was analyzed,which served as an evaluation metric for collision avoidance strategies.Subsequently,an analytical solution for orbital maneuver applicable to low-thrust propulsion was derived.This analytical solution introduces a novel collision avoidance method,which involved fine-tuning the spacecraft's orbital phase to reduce collision probability.Besides,this method could swiftly restore the original orbital phase post-maneuver.Numerical simulations demonstrate that the proposed collision avoidance strategy effectively reduced collision probability within a short time.The simulations also revealed the relation between collision avoidance time,fuel consumption,and thrust acceleration.
collision avoidance strategycollision probabilitylow-thrust propulsion systemanalytical control law
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