Mathematics – Probability
Scientific paper
Mar 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jhatd...6...51g&link_type=abstract
Johns Hopkins APL Technical Digest (ISSN 0270-5214), vol. 6, Jan.-Mar. 1985, p. 51-59. NASA-sponsored research.
Mathematics
Probability
Guidance Sensors, Hubble Space Telescope, Pointing Control Systems, Semiconductor Diodes, Binary Stars, Error Correcting Devices, Field Of View, Focal Plane Devices, Interferometers, Prisms, Stellar Magnitude
Scientific paper
Design features and the performance envelope of an alternate fine guidance sensor for the Space Telescope are delineated. A Digicon sensor, which requires focusing of a star image on the sensor, was selected as the alternate for the Koesters prism interferometer originally chosen. Optical elements scan the focal plane and are connected to star selecter servomechanisms. A 5 sq arcsec FOV serves as input, and guide stars have been identified to assure a 0.95 probability that one will always be present. The Digicon will permit pointing by 14.5 visual magnitude stars with errors kept below 0.004 arcsec. Guide star acquisition will be effected in the bang-bang mode with a state feedback in the linear area of the instrument error function. Simulations have demonstrated a satisfactory lock-on to stars down to 19th magnitude.
Grant David G.
Griffin M. D.
Strikwerda Thomas Earl
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