Design constraints of the LST fine guidance sensor

Details Design constraints of the LST fine guidance sensor Design constraints of the LST fine guidance sensor

Aug 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975guco.confq....w&link_type=abstract

American Institute of Aeronautics and Astronautics, Guidance and Control Conference, Boston, Mass., Aug. 20-22, 1975, 6 p.

Other

Design Analysis, Guidance Sensors, Hubble Space Telescope, Pointing Control Systems, Astronomical Observatories, Constraints, Focal Plane Devices, Interferometry, Photosensitivity, Reference Stars, Stellar Luminosity

Scientific paper

The LST Fine Guidance Sensor design is shaped by the rate of occurrence of suitable guide stars, the competition for telescope focal plane space with the Science Instruments, and the sensitivity of candidate image motion sensors. The relationship between these parameters is presented, and sensitivity to faint stars is shown to be of prime importance. An interferometric technique of image motion sensing is shown to have improved sensitivity and, therefore, a reduced focal plane area requirement in comparison with other candidate techniques (image-splitting prism and image dissector tube techniques). Another design requirement is speed in acquiring the guide star in order to maximize the time available for science observations. The design constraints are shown parametrically, and modelling results are presented.

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