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Magellan in-flight gyro/star scanner misalignment calibrationTechniques are described for the in-flight calibration of gyro/star scanner misalignments for the Magellan spacecraft. The poor observability of one of the six components of misalignment is discussed in the context of a simple least-squares estimation model. The assumptions that lead to singularity in the information matrix are explicitly stated and it is shown that the singularity persists for all scanner slit configurations using only two slits, regardless of slit geometry or separation. A set of misalignment error state variables, a configuration of three stars, and a maneuver/scan sequence is described which yields a well-conditioned information matrix for least-squares estimation of five of the six misalignments. Finally, it is shown by convariance simulation that ground-based optimal estimation can satisfactorily resolve all six components of the misalignment error when more than two star scanner slits are used.
Document ID
19910038325
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Boone, Jack N.
(Martin Marietta Corp. Denver, CO, United States)
Date Acquired
August 15, 2013
Publication Date
February 1, 1991
Publication Information
Publication: Journal of Guidance, Control, and Dynamics
Volume: 14
ISSN: 0731-5090
Subject Category
Spacecraft Instrumentation
Accession Number
91A22948
Funding Number(s)
CONTRACT_GRANT: JPL-956700
Distribution Limits
Public
Copyright
Other

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