Procedure for calculating attenuation in and reliability of atmospheric optical data transmission systems
Abstract
A procedure is developed for calculating the energy characteristics and the reliability of atmospheric data transmission systems operating in the optical range. The principal energy characteristic is the energy loss, which determines the signal attenuation in the optical channel. This parameter is evaluated in accordance with Bouguer's law, combining molecular absorption and scattering with absorption and scattering by aerosol particles. The aerosol contribution to attenuation is evaluated on the basis of a single universal parameter, namely the meteorological visibility range. Into account is taken the effect of atmospheric turbulence on both diffraction and refraction of light. For calculation of the reliability is needed the probability distribution of energy losses in the atmospheric channel. The probability of the losses exceeding the acceptable threshold level can be easily found when the general law of their probability distribution is known. The procedure has been formalized in a 9step algorithm which yields both signal attenuation and system reliability for given transmitter output power and minimum receiver input power. The design problem of ensuring a prescribed level of interference immunity is not considered here and the minimum receiver input power is assumed to have already been determined.
 Publication:

USSR Rept Electron Elec Eng JPRS UEE
 Pub Date:
 September 1985
 Bibcode:
 1985RpEEE.......91M
 Keywords:

 Aerosols;
 Atmospheric Attenuation;
 Bouguer Law;
 Data Transmission;
 Energy Dissipation;
 Reliability;
 Turbulence;
 Absorptivity;
 Algorithms;
 Probability Distribution Functions;
 Communications and Radar