I.Y. Eremeev – Dr.Sc. (Eng.), Professor, Scientist,

Military Space Academy named after A.F. Mozhajskii (St. Petersburg) 

E-mail: vka@mil.ru

I.V. Chebotar − Dr.Sc. (Eng.), 

Cherepovets Higher Military Engineering Order of Zhukov School of Radio Electronics

E-mail:cvviur6@mil.ru

A.S. Bosyy – Ph.D. (Eng.), 

Cherepovets Higher Military Engineering Order of Zhukov School of Radio Electronics

E.Y. Shilovsky − Scientist,

Military Space Academy named after A.F. Mozhajskii (St. Petersburg)

E-mail: vka@mil.ru

The article proposes an approach to reducing the redundancy of data representation in the relay channels of radio monitoring complexes with mobile relays on unmanned aerial vehicles. The main difference of the proposed approach is the use of spectral analysis methods implemented on overlapping samples in order to identify energetically significant spectral components for transmission over the relay channel using digital data compression algorithms. The main stages of the developed algorithm include the stage of splitting the array of complex samples from the output of the analog-to-digital converter into overlapping segments, the stage of representing the analyzed mixture in the spectral region using the fast Fourier transform, and the stage of localizing the time-frequency regions containing data on the detected signals. Cutting off the insignificant spectral components provides the opportunity to represent the electronic environment in the analysis interval in the form of a list of pairs of values of energy-significant spectral coefficients and their numbers. The stage of transmitting the received data on the electronic situation on the analysis interval over the communication channel from the unmanned aerial vehicle to the radio monitoring station. The stage of assessment at the radio monitoring station of the parameters of the radio signal in the frequency or time domain. To evaluate the parameters of the signals in the frequency domain, the spectrogram is reconstructed, provided that insignificant spectral coefficients, values of which were not transmitted from the unmanned aerial vehicle, are replaced by zeros. If it is necessary to use signal processing algorithms in the time domain, the technology of transition to the time domain based on in-line (conveyor, block) filtering is used. The originality of the offered approach to reduction of redundancy of data presentation in channels of relaying of complexes of a radio monitoring is defined by the maintenance of the offered third stage of processing. The conducted researches showed that application of the offered approach to reduction of redundancy of data presentation in channels of relaying of complexes of a radio monitoring is almost significant for the solution of a problem of estimation of parameters of sources of radio emissions in the conditions of aprioristic uncertainty of rather bearing signal frequency.

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