Name
Abstract | ||
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We address the problem of tracking relative translation in a leader-follower spacecraft formation using po- sition feedback and under parameter uncertainty (spacecraft mass) and uncertainty in the leader variables (true anomaly rate and rate of change). We only assume boundedness of orbital perturbations and the leader control force but with unknown bounds. Under these conditions we propose a controller that renders the closed-loop system weakly uniformly semiglobally practically asymptotically stable. In particular, the domain of attraction can be made arbitrarily large by picking convenient gains, and the state errors in the closed-loop system are proved to converge from any initial condition within the domain of attraction to a ball in close vicinity of the origin in a stable way; moreover, this ball can be diminished to a maximum precision by increasing the gains in the control law. Simulation results of a leader- follower spacecraft formation using the proposed controller are presented. I. I NTRODUCTION A. Background Spacecraft flying in formation are revolutionizing our way of performing space-based operations, and brings out several advantages in space mission accomplishment, as well as new opportunities and applications for such missions. The concept makes the way for new and better applications in space indus- try, and replacing large and complex spacecraft with a fleet o f micro-satellites introduces a multitude of advantages reg ard- ing mission cost and performance. However, the advantages of using spacecraft formations come at a cost of increased complexity and technological challenges. Formation flying introduces a control problem with strict and time-varying boundaries on spacecraft reference trajecto- ries, and requires detailed knowledge and tight control of r el- ative distances and velocities for participating spacecra ft. The control problem for the follower simplifies as the knowledge about the leader and its orbit increases. Complete knowledge of spacecraft masses, orbital parameters and orbital pertu r- bations is hard to achieve, since these often change during operation. In addition, velocity sensors are costly, heavy and computationally demanding, and therefore the follower spacecraft must often rely on measurements of the position of the leader spacecraft only. Hence, the challenge lies in synchronized control of the formation, with as little excha nge of information between spacecraft as possible. |
Year | DOI | Venue |
|---|---|---|
2006 | 10.1109/CDC.2006.377295 | Conference on Decision and Control |
Keywords | DocType | ISSN |
adaptive control,aircraft control,closed loop systems,feedback,position control,space vehicles,adaptive output feedback control,closed-loop system,leader-follower spacecraft formation,orbital perturbations,parameter uncertainty,position feedback,relative translation tracking,spacecraft relative translation | Conference | 0743-1546 |
ISBN | Citations | PageRank |
1-4244-0171-2 | 3 | 0.48 |
References | Authors | |
2 | 4 | |
Name | Order | Citations | PageRank |
|---|---|---|---|
| Raymond Kristiansen | 1 | 96 | 16.09 |
| Antonio Loria | 2 | 397 | 47.23 |
| Antoine Chaillet | 3 | 39 | 4.71 |
| Nicklasson, P.J. | 4 | 6 | 2.22 |