FES Fine Lock Guidance Test

Details FES Fine Lock Guidance Test FES Fine Lock Guidance Test

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990hst..prop.3360s&link_type=abstract

HST Proposal ID #3360

Mathematics

Probability

Hst Proposal Id #3360

Scientific paper

The current operational limit for fine lock is 13.0 magnitude, rather than the planned 14.5 magnitude. This restriction is due to the OTA spherical aberration and internal FGS effects. The limitation severly restricts the availability of guide stars for observations which require fine lock for guidance. The purpose of this test is to determine whether use of FES averaging time can allow the capture and guidance on stars fainter than 13.0, thus recovering the lost capability. This test will verify that fine lock averaging with NULL-BYPASS can be used to support pointing control. The discussions with the flight software engineers suggests that the FGS can be run with fine lock averaging as large as 100 milli-seconds without compromising the pointing control system. The probability of lock and the stability while in lock needs to be verified using the Spacecraft with an observation which is not scientifically critical before this method of guidance is used to support scientific observations.

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