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Proceedings Paper

Cassini star tracking and identification algorithms, scene simulation, and testing
Author(s): James W. Alexander; Daniel H. Chang
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Paper Abstract

The Cassini spacecraft uses a CCD-based star tracker, the Stellar Reference Unit (SRU), for attitude identification in the Attitude and Articulation Control Subsystem (AACS). SOftware to process SRU data resides in the Flight Computer (AFC) and is integrated with all other AACS functions. The Cassini mission will use autonomous star identification for initial attitude determination,and a star tracking function for maintaining attitude, both performed by processing pixel data produced by the SRU and sent to the AFC via a dma interface. Because of the complexity of the StarID software, special software simulation tools were created to simulate the SRU output as a function of commands, spacecraft attitude, and star screen, and allow the introduction of fault conditions.

Paper Details

Date Published: 7 October 1996
PDF: 26 pages
Proc. SPIE 2803, Cassini/Huygens: A Mission to the Saturnian Systems, (7 October 1996); doi: 10.1117/12.253430
Show Author Affiliations
James W. Alexander, Jet Propulsion Lab. (United States)
Daniel H. Chang, Jet Propulsion Lab. (United States)

Published in SPIE Proceedings Vol. 2803:
Cassini/Huygens: A Mission to the Saturnian Systems
Linda Horn, Editor(s)

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