Abstract
We advance the benefits of previously reported four-dimensional (4-D) weather cubes toward the creation of high-fidelity cloud-free line-of-sight (CFLOS) beam propagation for realistic assessment of autotracked/dynamically routed free-space optical (FSO) communication datalink concepts. The weather cubes accrue parameterization of optical effects and custom atmospheric resolution through implementation of numerical weather prediction data in the Laser Environmental Effects Definition and Reference atmospheric characterization and radiative transfer code. 4-D weather cube analyses have recently been expanded to accurately assess system performance (probabilistic climatologies and performance forecasts) at any wavelength/frequency or spectral band in the absence of field tests and employment data. The 4-D weather cubes initialize an engineering propagation code, which provides the basis for comparative percentile performance binning of FSO communication bit error rates (BERs) as a function of wide-ranging azimuth/elevation, earth-to-space uplinks. The aggregated, comparative BER binning analyzes for different regions, times of day, and seasons applying a full year of 4-D weather cubes data provided numerous occasions of clouds, fogs, and precipitation events. The analysis demonstrated the utility of 4-D weather cubes for adroit management of CFLOS opportunities to enhance performance analyses of point-to-point as well as evolving multilayer wireless network concepts.
Highlights
The lure of terrestrial free-space optical (FSO) communications architectures to meet the evergrowing demand for increased bandwidth and data rates has motivated dozens if not hundreds of research teams the world over for more than two decades
High bit error rate (BER), or poor performance, were evident at high zenith angles throughout the entire data set. This is to be expected since the laser and the optical link traverse large amounts of atmosphere where atmospheric attenuation proves troublesome for FSO wavelengths
In order to do so and further demonstrate the tractability of this new tool, the weather cubes were coupled to HighEnergy Laser End-to-End Operational Simulation (HELEEOS), a standard scaling law laser propagation code
Summary
The lure of terrestrial free-space optical (FSO) communications architectures to meet the evergrowing demand for increased bandwidth and data rates has motivated dozens if not hundreds of research teams the world over for more than two decades. This enthusiasm is offset to some extent by light’s known susceptibility to atmospheric effects, especially optical turbulence and extinction due to aerosols, clouds, fog, and precipitation. The index of refraction structure constant C2n is widely used to classify optical turbulence strength This parameter is folded into the calculation of a scintillation index. Barrios and Dios[1] compiled an excellent summary of this methodology
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