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20 June 2001 Earth beacon acquisition and tracking under various illumination conditions
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Proceedings Volume 4272, Free-Space Laser Communication Technologies XIII; (2001)
Event: Photonics West 2001 - LASE, 2001, San Jose, CA, United States
The use of sun-illuminated Earth images has been explored to aid in meeting the stringent pointing requirements for deep space optical downlink telemetry. It has been shown that fully illuminated Earth images provide a symmetry that easily lends to the determination of the geocenter. Since more often than not, the Earth is only partially illuminated by the sun, additional work is required to meet the pointing requirements under all illumination conditions. This paper develops an algorithm for determining the geocenter of the Earth regardless of the illumination by the sun using sub-pixel scanning and a simple thresholding technique. To complete this approach the acquisition algorithm is paired with a tracking technique based on maximum likelihood estimation. Results have indicated that the algorithm works well to locate and track the position of the Earth and, thereby, a receiving station. Results of the experiments are presented and compared with other techniques.
© (2001) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Barbara E. Marino, Haiping Tsou, and Tsun-Yee Yan "Earth beacon acquisition and tracking under various illumination conditions", Proc. SPIE 4272, Free-Space Laser Communication Technologies XIII, (20 June 2001);

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