K Factor Adjustment Test

Details K Factor Adjustment Test K Factor Adjustment Test

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990hst..prop.3368s&link_type=abstract

HST Proposal ID #3368

Computer Science

Performance

Hst Proposal Id #3368

Scientific paper

The performance of the FGSs in acquiring and holding faint guide stars in fine lock is worse than the pre-launch expectations. As result guide stars, which are usable in fine lock, are not available over much of the sky in the density that is necessary. In addition, the characteristics of the FGS transfer functions differ from the pre-launch assumptions in ways which affect the selection of the K-factors, which control how the FGS works. Dr. L. G. Taff has developed a simulation of the FGS walkdown and fine lock algorithms that are implemented in the flight software and hardware to investigate the effect of the transfer functions on the selection of values for the K-factors. With this simulation, he has shown that it is possible to chose K-factors that will improve the performance of the FGS particularly for faint stars. Prior to using these new values with scientific observations, the validity of the model and the new K-factors must be demonstrated. This test performs that verification.

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