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A lightweight, low-cost star camera designed for interplanetary
missions
Chapel, Jim D | Kiessig, Richard
Guidance and control 1998; Proceedings of the 21st Annual AAS
Rocky Mountain Guidance and Control Conference, Breckenridge, CO;
UNITED STATES; 4-8 Feb. 1998. pp. 345-355. 1998
A lightweight, low cost star camera has been developed for
spacecraft applications where mass and cost constraints are
critical design drivers. This Star Tracker Camera (STC) has been
incorporated into the attitude determination sensor suite for the
Mars Surveyor Program (MSP) and the STARDUST program. The STC
design provides attitude measurement accuracies of +/- 500
microrad, 3-sigma, in pitch and yaw, and +/- 1500 microrad,
3-sigma, in roll. Because the image processing is hosted on the
spacecraft's computer, the unit weighs only 1.2 kg, and uses a
small amount of power (less than 7.0 W with 1-Hz updates). The STC
incorporates a compact, three-element, wide field-of-view (FOV)
lens based on the lens developed for the Clementine spacecraft.
For the camera's 25-deg circular FOV, a star catalog with 933
stars provides full sky coverage. The Stellar Compass software
uses pattern matching techniques to provide a quaternion output.
In acquisition mode, candidate stars are compared with the entire
star catalog to achieve a 'lost-in-space' capability. We provide
an overview of the Stellar Compass software design and operation,
and discuss the selection of the embedded star catalog for these
missions. Finally, we present some test data for the engineering
development unit. (Author)
 Descriptors: LOW COST | STAR TRACKERS | CAMERAS | FIELD OF VIEW | PERFORMANCE
ASSESSMENT | SOFTWARE ENGINEERING
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