NDLI: Operational support for upper atmosphere research satellite (uars) attitude sensors

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Operational support for upper atmosphere research satellite (uars) attitude sensors

Content Provider	NASA Technical Reports Server (NTRS)
Author	Garber, A. Raina, P. Woodruff, C. Lee, M. Underwood, S. Lambertson, M.
Copyright Year	1994
Description	The Upper Atmosphere Research Satellite (UARS) has several sensors that can provide observations for attitude determination: star trackers, Sun sensors (gimbaled as well as fixed), magnetometers, Earth sensors, and gyroscopes. The accuracy of these observations is important for mission success. Analysts on the Flight Dynamics Facility (FDF) UARS Attitude task monitor these data to evaluate the performance of the sensors taking corrective action when appropriate. Monitoring activities range from examining the data during real-time passes to constructing long-term trend plots. Increasing residuals (differences) between the observed and expected quantities is a prime indicator of sensor problems. Residual increases may be due to alignment shifts and/or degradation in sensor output. Residuals from star tracker data revealed and anomalous behavior that contributes to attitude errors. Compensating for this behavior has significantly reduced the attitude errors. This paper discusses the methods used by the FDF UARS attitude task for maintenance of the attitude sensors, including short- and long-term monitoring, trend analysis, and calibration methods, and presents the results obtained through corrective action.
File Size	812990
Page Count	14
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19940031110
Archival Resource Key	ark:/13960/t18m27f5n
Language	English
Publisher Date	1994-05-01
Access Restriction	Open
Subject Keyword	Spacecraft Instrumentation Solar Sensors Magnetometers Attitude Control Calibrating Aerodynamics Attitude Indicators Upper Atmosphere Research Satellite Uars Real Time Operation Errors Attitude Inclination Alignment Star Trackers Trend Analysis Gyroscopes Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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