ANALYSIS OF THE SYNCHRONISM ENTERING PROCESS ROBUSTNESS IN UAV’S RADIO CONTROL LINE WITH FHSS
DOI:
https://doi.org/10.15588/1607-3274-2020-2-2Keywords:
Broadband signals, frequency-hopping spread spectrum (FHSS), noise immunity, synchronism, simulation model, unmanned aerial vehicle (UAV).Abstract
Context. The experience of joined forces operation in the east of the country has shown that in the process of completing tasks, an unmanned aerial vehicle (UAV) is forced to operate in a rather difficult environment. The most significant is the problem of ensuring the transfer of command commands between the aircraft and the ground control post in the face of powerful intentional interference by the enemy. The work as a UAV control channel proposes the use of frequency-hopping spread spectrum (FHSS). When constructing the UAV control line with the FHSS, the main consideration should be given to the process of entering synchronism as the primary one in relation to the process of transmitting control commands. Within this problem, it is necessary to evaluate the noise immunity of the process of entering into the synchronism of the UAV control line with the FHSS in the conditions of powerful intentional interference of the enemy.
Objective. The purpose of the article is to analyze the noise immunity of the process of entering into the synchronism of the UAV radio control line with the FHSS in the conditions of the powerful intentional interference of the enemy.
Methods. In the work, on the basis of the developed simulation model (SM) of the process of entering into synchronism of the UAV control line with the FHSS, a number of experiments and estimation of the noise immunity of the process of entering into the synchronism of the UAV control line with the FHSS under conditions of powerful intentional interference.
Results. Using the developed SM, the dependence of the probability of true and false occurrence in the synchronism of the UAV control line with the FHSS for one cycle, one sub-cycle and one frequency position of transmission from different values of the signal-to-noise ratio at the affected and unaffected frequency of entry for different values characterizing interference. The simulation results are presented as graphs.
Conclusions. Comparison of the simulation results with the analytical ones confirms the adequacy of the synthesized mathematical model of the process of entering into the synchronism of the UAV control line with the FHSS and allows to determine the optimal parameters of the algorithm of entering the synchronization that will be satisfied.
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