OPTIMIZATION OF MULTI-FREQUENCY COMMUNICATION OF LOW ALTITUDE UAV AT REGIME OF AIR-GROUND
Fakhraddin Agayev, H. H. Asadov, Peri Zulfigarli · Perm National Research Polytechnic University Aerospace Engineering Bulletin · 2021
The paper is devoted to questions on optimization of multi-frequency communication of air-ground type by utilization of unmanned aerial vehicles. The multi-frequency regime of communication of low altitude UAV with ground receivers located at different distances is considered. The known model for calculation of route losses, taking into account the probability of pres-ence or lack of direct vision and also losses of signal upon propagation on such distances is analyzed. The known model make it possible to calculate the total route losses but don’t provide any possibility to to realize any optimization procedure. The possi-bility for realization of regime of adaptation envisaging change of carrying frequency depending of distance, i.e. transfer to adap-tive multi-frequency communication regime is considered. Taking into account the known solutions on utilization of probability-convolutional estimates, the total probability of full communication upon presence or lack of direct vision zones is determined by help of such model. It was assumed that additional losses due to effect of environmental factors are lacked. The parameter χ, defined as losses at unit of distance is introduced. The solution is obtained in line of which χ reaches its minimum value. The multi-frequency communication regime is suggested in line which the carrier frequency changes depending on distance. The in-tegrated averaged parameter ср is suggested to research this regime. The target optimization functional is formulated taken into account the additionally introduced limitation condition. The solution of optimization task is calculated which provides for maxi-mum of target functional. In order to remove such a worst regime the quazy-optimum regime is suggested in line which the car-rier frequency is linearly increases on distance as far as receiver. The condition to reach gain in such regime is described.