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Protection of robotics control channels

DOI 10.18127/j00338486-201812-08

Keywords:

S.V. Dvornikov – Dr.Sc.(Eng.), Professor, Associate Professor, Department of Telecommunication, S.M. Budjonny Military Academy of Signal Corps (Saint Petersburg)
E-mail: practicdsv@yandex.ru
E.A. Popov – Ph.D.(Eng.), Associate Professor, Higher School of Applied Physics and Space Technologies of Peter The Great St. Petersburg Polytechnic University
E-mail: Eugapop@gmail.com
R.V. Ivanov – Engineer, Department of Telecommunication, S.M. Budjonny Military Academy of Signal Corps (Saint Petersburg)
E-mail: practicdsv@yandex.ru


Modern robotics is a complex automated radio engineering system. Its main vulnerability is the control radio channels, since their availability opens up the possibility of external destructive information-technical impact (DITI), which leads to robotics disruption.
For remote robotics control a limited set of commands is used. For their transmission over the radio channel signal structures are formed on the basis of frequency manipulation, due to its formation simplicity and relatively high noise immunity under the external noise influence. DITI uses simulation noise, which structure corresponds to the signals of an allowed command. This type of interference is the most efficient way of electronic suppression of robotics radio control channels, because it provides the desired result with sufficiently low power consumption, comparable to the energy potential of the suppressed radio line.
The paper introduces the simulation efficiency coefficient, which characterizes the time mismatch between structural noise and the interval of the suppressed signal at the demodulator input. This indicator is based on the analysis of the error emergence probability in the incoherent reception conditions, depending on the signal-to-noise ratio at the decider input.
We propose the following DITI compensating process. Since the frequency detector compares the received signal energy at the fre-quency positions of information symbols with a pre-set limit, this limit will be exceeded in both frequency channels even with clock noise desynchronization. To determine the actual structure of the useful signal, we offer to divide the accepted realization on the duration of the affected parcel into two sequences, and then to form the spectrum for each of them.
We propose to accept the actual frequency of the entire signal on the basis of the spectral components analysis and the selected decision limit. Then the affected signal fragment is replaced with the corresponding reference oscillation. The input implementation can be passed through the amplitude limiter to avoid incorrect decisions based on differences between signal and noise power.

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