Minimizing the Effects of Navigation Uncertainties on the Spacecraft Rendezvous Precision
Résumé
The ability to robustly and precisely control the spacecraft
relative motion will play an important role in future on-orbit
inspection and on-orbit servicing missions. Model predictive
control (MPC) is considered to be an effective control strategy for
these types of spacecraft operations, which can easily handle mission
specificconstraintswhileexplicitlyminimizingthefuelconsumption. The maneuvers plan is obtained by solving a finite horizon open-
loop optimal control problem starting from the spacecraft relative
state, and the optimal solution consists of a series of control actions out of which only the first one is executed.
Some ideas from tube-basedMPCare used in this Note to solve the
robust fixed-time spacecraft rendezvous problem for eccentric
reference orbits. The purpose is to obtain a sequence of feedback
policies that steers the spacecraft from an initial relative state toward
an ellipsoidal set centered around a desired final state, in the presence
of navigation uncertainties. This must be done while respecting the
actuators saturation constraints and while pursuing a double
objective: minimize the fuel cost of the mission and minimize the size
of the arrival set to guarantee a good rendezvous precision. The
control policies are restricted to affine disturbance feedback policies
to ensure a convex formulation of the control synthesis problem. The
obtained sequence of feedback policies drives the system to the
guaranteed arrival set without any need for recurrent optimization.
Domaines
AutomatiqueOrigine | Fichiers produits par l'(les) auteur(s) |
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