Optimization the Effect of Rainfall on the Efficiency of Open Laser Atmospheric Communication

Abstract

Relevance. Open laser atmospheric communication systems are affected by weather conditions. A large number of model theoretical and experimental studies have been devoted to the influence of rains on the effectiveness of open laser atmospheric communication. However, the issue of choosing the parameters of an open laser atmospheric optical communication system with a star-shaped structure, taking into account the need to minimize signal loss, has not yet been considered.

The aim of the study is to develop a method for optimizing the star-shaped structure of open laser atmospheric communication in order to minimize the total loss of the optical signal due to visibility limitations at many distances between the center and peripheral nodes.

The essence of the method consists in compiling and solving a variational optimization problem for estimating the total losses in all directions of the star-shaped structure of the data transmission system using a selected well-known model of attenuation of the optical signal due to the effect of rain (in this model, the visibility indicator at distances from the center to the peripheral node is explicitly included).

Experiments. The conducted approbation experimental studies have generally confirmed the reliability of the models used as the basis of the conducted research.

As a result of theoretical model studies, an expression was obtained for calculating the maximum achievable total optical signal losses in star-shaped open laser atmospheric communication networks. In addition, it was found that in the star-shaped structure of open laser atmospheric communication, the maximum total losses of the optical signal in the case of accepting the integral constraint on the newly introduced functional dependence between the distances from the peripheral node to the center and local visibility occur in the case when the distance from the transmitting center to the peripheral receiving nodes is proportional to the square root of local visibility.

Practical significance. Based on the results obtained, recommendations have been developed for determining the distance of the reception nodes from the center. It is planned to implement the results obtained in the projected open laser atmospheric communication network "Center-suburban hubs" on the Absheron Peninsula.