5th GOES Users' Conference


The ABI star sensing and star selection

Ken Ellis, ITT Space Systems Division, Fort Wayne, IN; and K. Gounder, P. Griffith, E. Hoffman, D. Igli, J. Ogle, and V. Virgilio

The ABI (Advanced Baseline Imager) uses periodic star sensing to determine the absolute line of sight. Using a specifically tailored onboard star catalogue, the ABI can sense visible stars (0.64 m) for image navigation and IR stars (3.90 m) for coregistrtaion purposes. The 3 location accuracy for stars of magnitude 7 is expected to be better than 2.5 rad for the visible stars and 6 rad for the IR stars. The ABI star sense algorithm simulates the star observation with the relevant mechanical and optical effects. It employs a centroiding technique and is robust against signal geometry, background noise, clutter, jitter and degradation. The onboard ABI star catalogue is prepared using appropriate selection criteria based on the ABI field of view, star isolation, and brightness.

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Poster Session 1, Fifth GOES Users' Confererence Poster Session
Wednesday, 23 January 2008, 2:30 PM-4:00 PM, Exhibit Hall B

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