The ability of light to penetrate the sea to operationally useful depths, the ease with which optical energy can be generated and modulated, and the ability to direct this energy into narrow beams utilizing small antennas (optical systems) illustrate the theoretical feasibility of optical communication links in the sea. For example, when the proportionate sea path is limited to lengths of hundreds of feet (or meters), optical communication links between ...
A multiple scattering model is used and extended to characterize the channel between underwater and airborne (satellite) terminals at optical frequencies. The effects of the air/sea interface are also included with approximate solutions accurate for elevation angles above 45 degrees. The results are presented in terms of a radiance function which is related to the transform of the spatial covariance function (mutual coherence function). The primary losses are shown to ...
The paper presents an investigation of the problem of maximum likelihood detection of one of M poisson processes in a background of additive poisson noise. When the observables correspond to counts of emitted photoelectrons, the problem models a discrete version of a coherent M-ary optical communication system using photon counters in the presence of background radiation. Consideration is given to an average distance and a detection probability criterion. The advantages ...
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