Acquisition in short-range free-space optical communication

Jin Wang; Joseph M. Kahn

doi:10.1117/12.455523

6 December 2002 Acquisition in short-range free-space optical communication

Jin Wang, Joseph M. Kahn

Proceedings Volume 4873, Optical Wireless Communications V; (2002) https://doi.org/10.1117/12.455523
Event: ITCom 2002: The Convergence of Information Technologies and Communications, 2002, Boston, MA, United States

Abstract

We consider the acquisition process in short-range (1~10 km) free-space optical communication between moving parties when covertness is the overriding system performance requirement. In order to maximize covertness, it is critical to minimize the time required for the acquisition phase, during which the party initiating contact must conduct a broad-field scan, and risks revealing his position. Assuming an elliptical Gaussian beam profile, we show how to optimize the beam divergence angles, scan speed and design of the raster scan pattern so as to minimize acquisition time. In this optimization, several constraints are considered, including: SNR required for accurate bearing detection and reliable decoding, limited receiver bandwidth, limited scanner speed, and beam divergence as limited by the scanner mirror dimensions. Design examples are given to illustrate the design procedure and by these examples, we show that the optimum beam profile is often elliptical with high eccentricity, though the search field is circularly symmetric.

Citation Download Citation

Jin Wang and Joseph M. Kahn "Acquisition in short-range free-space optical communication", Proc. SPIE 4873, Optical Wireless Communications V, (6 December 2002); https://doi.org/10.1117/12.455523

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