CARRIER DIFFERENTIAL GPS FOR REAL-TIME CONTROL OF LARGE FLEXIBLE STRUCTURES

E. Harrison Teague, Jonathan P. How, and Bradford W. Parkinson

Peer Reviewed

Abstract: Current laboratory tests demonstrate vibration and orientation control of a highly flexible vehicle using only the GPS carrier to measure motion. A 30 ft long test structure has been constructed that is suspended from above, and moves in a manner analogous to that of a flexible orbiting platform. Experiments show simultaneous rigid-body orientation and elastic vibration control by closing a feedback loop from the GPS differential carrier phase (DCP) measurements to on- board thrusters. Use of the subcentimeter-level differential position information in DCP measurements is challenging because of inherent, and arbitrarily large, measurement biases (cycle ambiguities). This paper presents a new bias ambiguity resolution algorithm that combines measurements taken during motion of the structure with a model of the platform dynamics to initialize the unknown biases. The techniques presented are applicable to systems that exhibit relative motions with frequencies (< 10 Hz) and deflections (> 1 cm) that are detectable by current receivers.
Published in: NAVIGATION, Journal of the Institute of Navigation, Volume 44, Number 2
Pages: 215 - 230
Cite this article: Teague, E. Harrison, How, Jonathan P., Parkinson, Bradford W., "CARRIER DIFFERENTIAL GPS FOR REAL-TIME CONTROL OF LARGE FLEXIBLE STRUCTURES", NAVIGATION, Journal of The Institute of Navigation, Vol. 44, No. 2, Summer 1997, pp. 215-230.
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