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Time Shift Governor for Constraint Satisfaction during Low-Thrust Spacecraft Rendezvous in Near Rectilinear Halo Orbits | IEEE Conference Publication | IEEE Xplore

Time Shift Governor for Constraint Satisfaction during Low-Thrust Spacecraft Rendezvous in Near Rectilinear Halo Orbits


Abstract:

A parameter governor-based control scheme is developed to enforce various constraints, such as the Line of Sight (LoS) cone angle, the thrust limit, and the relative appr...Show More

Abstract:

A parameter governor-based control scheme is developed to enforce various constraints, such as the Line of Sight (LoS) cone angle, the thrust limit, and the relative approach velocity during rendezvous missions in a near rectilinear halo orbit (NRHO) in the Earth-Moon system. The parameter governor is an add-on scheme to the nominal closed-loop system, which dynamically adjusts controller parameters in order to enforce the constraints. For the application to the rendezvous mission, we utilize the Time Shift Governor (TSG) which time shifts the target trajectory commanded to the Deputy spacecraft controller. The time shift is gradually reduced to zero so that the virtual target trajectory gradually converges to the Chief spacecraft trajectory as time evolves, and the rendezvous mission can be accomplished. Simulation results are reported that demonstrate the effectiveness of the proposed control scheme.
Date of Conference: 16-18 August 2023
Date Added to IEEE Xplore: 22 September 2023
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Conference Location: Bridgetown, Barbados

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