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Error modeling of precision orientation sensors in a fixed base simulationModels of noise and dynamic characteristics of gyro and autocollimator for very small signal levels are presented. Measurements were evaluated using spectral techniques for identifying noise from base motion. The experiment was constructed to measure the precession, due to relativistic effects, of an extremely precise earth-orbiting gyroscope. The design goal for nonrelativistic gyro drift is 0.001 arcsec per year. An analogous fixed base simulator was used in developing methods of instrument error modeling and performance evaluation applicable to the relativity experiment sensors and other precision pointing instruments. Analysis of autocollimator spectra uncovered the presence of a platform gimbal resonance. The source of resonance was isolated to gimbal bearing elastic restraint properties most apparent at very small levels of motion. A model of these properties which include both elastic and coulomb friction characteristics is discussed, and a describing function developed.
Document ID
19740023814
Acquisition Source
Legacy CDMS
Document Type
Thesis/Dissertation
Authors
Klinger, D. L. (Stanford Univ. CA, United States)
Date Acquired
September 3, 2013
Publication Date
July 1, 1974
Subject Category
Instrumentation And Photography
Report/Patent Number
SUDAAR-481
NASA-CR-139672
Accession Number
74N31927
Funding Number(s)
CONTRACT_GRANT: NGR-05-020-019
CONTRACT_GRANT: F33615-72-C-1297
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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