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Proceedings Paper

Extended-image spatial tracking technique for deep-space optical downlinks
Author(s): Haiping Tsou; Caroline S. Racho; Tsun-Yee Yan
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Paper Abstract

This paper describes an extended-image tracking technique based on the maximum likelihood estimation. The target image is assumed to have a known profile covering more than one element of a focal plane detector array. It is assumed that the relative position between the imager and the target is changing with time and the received target image has each of its pixels disturbed by an independent additive white Gaussian nose. When a rotation-invariant movement between imager and target is considered, the maximum likelihood based image tracking technique described in this paper is a closed-loop structure capable of providing iterative update of the movement estimate by calculating the loop feedback signals from a weighted correlation between the currently received target image and the previously estimated reference image in the transform domain. The movement estimate is then used to direct the imager to closely follow the moving target. This image tracking technique has many potential applications, including free-space optical communications and astronomy where accurate and stabilized optical pointing is essential.

Paper Details

Date Published: 27 September 1999
PDF: 9 pages
Proc. SPIE 3762, Adaptive Optics Systems and Technology, (27 September 1999); doi: 10.1117/12.363565
Show Author Affiliations
Haiping Tsou, Jet Propulsion Lab. (United States)
Caroline S. Racho, Jet Propulsion Lab. (United States)
Tsun-Yee Yan, Jet Propulsion Lab. (United States)

Published in SPIE Proceedings Vol. 3762:
Adaptive Optics Systems and Technology
Robert K. Tyson; Robert Q. Fugate, Editor(s)

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