9 June 1992 Extended-source spatial acquisition process based on maximum- likelihood criterion for planetary optical communications
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Proceedings Volume 1635, Free-Space Laser Communication Technologies IV; (1992); doi: 10.1117/12.59273
Event: OE/LASE '92, 1992, Los Angeles, CA, United States
Abstract
This paper describes an extended-source spatial acquisition process based on the maximum likelihood criterion for interplanetary optical communications. The objective is to use the sun-lit Earth image as a receiver beacon and point the transmitter laser to the Earth-based receiver to establish a communication path. The process assumes the existence of a reference image. The uncertainties between the reference image and the received image are modeled as additive white Gaussian disturbances. It has been shown that the optimal spatial acquisition requires solving two nonlinear equations to estimate the coordinates of the transceiver from the received camera image in the transformed domain. The optimal solution can be obtained iteratively by solving two linear equations. Numerical results using a sample sun-lit Earth as a reference image demonstrate that sub-pixel resolutions can be achieved in a high disturbance environment. Spatial resolution is quantified by Cramer-Rao lower bounds.
© (1992) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Tsun-Yee Yan, "Extended-source spatial acquisition process based on maximum- likelihood criterion for planetary optical communications", Proc. SPIE 1635, Free-Space Laser Communication Technologies IV, (9 June 1992); doi: 10.1117/12.59273; https://doi.org/10.1117/12.59273
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KEYWORDS
Image processing

Transceivers

Optical communications

Receivers

Free space optical communications

Laser applications

Detector arrays

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