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Preventing Aim At An Undesired TargetElectronic system controls changes in orientation of optical instrument. Slew-control system includes avoidance-control logic, which overrides slew-control error generator when line of sight of instrument comes within cone of avoidance around line of sight to Sun. Normal slewing trajectory interrupted by avoidance-control logic, which computes actuator torques taking line of sight around cone of avoidance. Used to protect delicate photodetectors in servocontrolled infrared spectrometer or imaging instrument against damage occurring if instrument aimed at Sun or another excessively bright object.
Document ID
19910000362
Acquisition Source
Legacy CDMS
Document Type
Other - NASA Tech Brief
Authors
Goodzeit, Neil E.
(General Electric Co.)
Date Acquired
August 14, 2013
Publication Date
August 1, 1991
Publication Information
Publication: NASA Tech Briefs
Volume: 15
Issue: 8
ISSN: 0145-319X
Subject Category
Electronic Systems
Report/Patent Number
NPO-18077
Accession Number
91B10362
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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