Stellar reference unit for CASSINI mission

Details Stellar reference unit for CASSINI mission Stellar reference unit for CASSINI mission

Sep 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994spie.2210..150b&link_type=abstract

Proc. SPIE Vol. 2210, p. 150-161, Space Optics 1994: Space Instrumentation and Spacecraft Optics, Thierry M. Dewandre; Joachim J

Physics

Optics

Scientific paper

For the CASSINI mission, Officine Galileo are presently developing, under Jet Propulsion Laboratory (JPL) contract, a CCD based star tracker, named Stellar Reference Unit (SRU). The SRU will be used in a new attitude determination approach developed by JPL, in which 'gyroless' operation can be implemented. The unit has a wide angle (15 degree(s) full cone) Field of View (FOV) and a maximum sensitivity up to +6 Visual Magnitude for an integration time of 400 msec. Exposure time can be commanded via Attitude and Articulation Control Subsystem Flight Computer (AFC) from 0 to 65535 msec. Optics characteristics and centroiding algorithm for star position determination, are defined by Officine Galileo, to achieve required performance (total accuracy: 53 (mu) rad, 3(sigma) ). The defined centroiding algorithm will be then implemented on the AFC. In this paper, the SRU architecture, characteristics, and main technological areas are described. Expected performance is reported.

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