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COBE attitude as seen from the FDFThe goal of the Flight Dynamics Facility (FDF) attitude support is twofold: to determine spacecraft attitude and to explain deviations from nominal attitude behavior. Attitude determination often requires resolving contradictions in the sensor observations. This may be accomplished by applying calibration corrections or by revising the observation models. After accounting for all known sources of error, solution accuracy should be limited only by observation and propagation noise. The second half of the goal is to explain why the attitude may not be as originally intended. Reasons for such deviations include sensor or actuator misalignments and control system performance. In these cases, the ability to explain the behavior should, in principle, be limited only by knowledge of the sensor and actuator data and external torques. Documented here are some results obtained to date in support of the Cosmic Background Explorer (COBE). Advantages and shortcomings of the integrated attitude determination/sensor calibration software are discussed. Some preliminary attitude solutions using data from the Diffuse Infrared Background Experiment (DIRBE) instrument are presented and compared to solutions using Sun and Earth sensors. A dynamical model is constructed to illustrate the relative importance of the various sensor imprefections. This model also shows the connection between the high- and low-frequency attitude oscillations.
Document ID
19910007765
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Sedlak, J. (Computer Sciences Corp. Silver Spring, MD, United States)
Chu, D. (Computer Sciences Corp. Silver Spring, MD, United States)
Scheidker, E. (Computer Sciences Corp. Silver Spring, MD, United States)
Date Acquired
September 6, 2013
Publication Date
December 1, 1990
Publication Information
Publication: NASA, Goddard Space Flight Center, Flight Mechanics(Estimation Theory Symposium, 1990
Subject Category
Astrodynamics
Accession Number
91N17078
Funding Number(s)
CONTRACT_GRANT: NAS5-31500
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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