A.M. Chudnov1, B.I. Poligintsev2, Ya.V. Kichko3

1,3 S.M. Budyonny Military Academy of Communications (Saint Petersburg, Russia)

2 Peter The Great St. Petersburg Polytechnic University (Saint-Petersburg, Russia)

Problem statement. The creation and development of unmanned aerial vehicles (UAVs) is one of the priority scientific and technical tasks aimed at improving the efficiency of systems in various sectors of the national economy. The basis for the functioning of the UAV group is the data transmission system (DTS) included in it, which ensures the interaction of the objects of the group with each other and with external objects. Taking into account the specifics of the properties and conditions of use of UAVs, as well as the impact on them of radio interference from other systems, the task of analyzing and optimizing the noise immunity of the DTS to ensure guaranteed exchange of messages between the objects of the group becomes extremely relevant.

Target. To develop a methodology for analyzing the noise immunity of the DTS of a group of UAVs in the class of possible interference with a limitation on the source power, as well as justifying the parameters of the DTS that provide the necessary noise immunity.

Results. The DTS noise immunity level is formally defined as the maximum interference power at which a given probability of timely message delivery is guaranteed. Taking into account the specifics of the study, the problem is formulated in a game-theoretic formulation. The worst (optimized) interference is understood as interference generated by a countersystem (source) with a limited average power, at which the minimum probability of timely message delivery is achieved.

For packet-switched DTS using pseudo-random signals and error-correcting coding, relations are obtained that determine the worst possible interference in the form of a composition of interference power distributions: 1) over signals (signal sub-elements) in radio links to influence the transmission/reception of channel blocks; 2) between DTS objects to disrupt the process of exchanging data packets at the network level. The justification of the system parameters is carried out according to the minimax criterion, which, in the framework of the game-theoretic statement of the problem, corresponds to the problem of maximizing the lower price of the corresponding game of the communication system with the countersystem.

At the physical level, the optimal interference operates in a pulsed mode, the parameters of which are determined based on the information known to the interference source about the design of the data transmission channel and the algorithm of its operation. The indicators of redundancy of pseudo-random signals are determined, at which the maximum information transfer rate is guaranteed. At the DTS network level, the interference energy is optimally distributed among the objects of the UAV group. A technique is given for forming a system of routing tables that route data packets along the shortest routes, taking into account the optimized distribution of interference.

The conditions under which the minimum admissible probability of timely delivery of messages is guaranteed are determined. Examples of calculating the noise immunity indicators of the DTS, as well as the parameters that determine the data exchange algorithm and the strategy for setting the optimized interference, are given. Graphs of dependences of the probability of timely delivery of packets on the interference power are presented, illustrating the methodology for calculating the noise immunity of the DTS.

Practical significance. The proposed method makes it possible to calculate the level of noise immunity of the designed DTS with packet transmission of messages using various types of modulation and coding. Calculations using the technique form the foundation for substantiating technical solutions for the construction and use of algorithms for generating and processing data, as well as routing packets in the UAV DTS with guaranteed compliance with the requirements for the timely delivery of messages.

Chudnov A.M., Poligintsev B.I., Kichko Ya.V. Analysis of data exchange immunity UAV groups under optimized interference. Radiotekhnika. 2022. V. 86. № 12. P. 33−46. DOI: https://doi.org/10.18127/j00338486-202212-03 (In Russian)

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