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SPHERES Tethered Formation Flight Testbed: Application to NASA’s SPECS Mission

Chung, Soon-Jo and Kong, Edmund M. and Miller, David W. (2005) SPHERES Tethered Formation Flight Testbed: Application to NASA’s SPECS Mission. In: UV/Optical/IR Space Telescopes: Innovative Technologies and Concepts II. Proceedings of SPIE. No.5899. Society of Photo-Optical Instrumentation Engineers (SPIE) , Bellingham, WA, Art. No. 58990L. ISBN 9780819459046.

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This paper elaborates on theory and experiment of the formation flight control for the future space-borne tethered interferometers. The nonlinear equations of multi-vehicle tethered spacecraft system are derived by Lagrange equations and decoupling method. The preliminary analysis predicts unstable dynamics depending on the direction of the tether motor. The controllability analysis indicates that both array resizing and spin-up are fully controllable only by the reaction wheels and the tether motor, thereby eliminating the need for thrusters. Linear and nonlinear decentralized control techniques have been implemented into the tethered SPHERES testbed, and tested at the NASA MSFC's flat floor facility using two and three SPHERES configurations. The nonlinear control using feedback linearization technique performed successfully in both two SPHERES in-line configuration and three triangular configuration while varying the tether length. The relative metrology system, using the ultra sound metrology system and the inertial sensors as well as the decentralized nonlinear estimator, is developed to provide necessary state information.

Item Type:Book Section
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URLURL TypeDescription
Chung, Soon-Jo0000-0002-6657-3907
Miller, David W.0000-0001-6099-0614
Additional Information:© 2005 International Society for Optical Engineering. The authors would like to gratefully acknowledge NASA for both financial and technical support for the MITSSL and PSI SPHERES Tether program. This work has been sponsored under NASA Phase II SBIR contact (Contract No.: NNG05CA09C).
Funding AgencyGrant Number
Subject Keywords:stellar interferometer, space tether, formation flight
Series Name:Proceedings of SPIE
Issue or Number:5899
Record Number:CaltechAUTHORS:20161122-111732319
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Official Citation:Soon-Jo Chung ; Edmund M. Kong ; David W. Miller; SPHERES tethered formation flight testbed: application to NASA's SPECS mission. Proc. SPIE 5899, UV/Optical/IR Space Telescopes: Innovative Technologies and Concepts II, 58990L (August 24, 2005); doi:10.1117/12.614643.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:72245
Deposited By: Ruth Sustaita
Deposited On:22 Nov 2016 20:10
Last Modified:11 Nov 2021 04:58

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