O.A. Nokhrin, I.E. Kalmychkov

Nowadays are known both methods of the processing radio signals with a frequency hopping and signal modulation recognition methods of single sideband suppressed carrier (SSBSC). Implementation of these techniques in radio monitoring tools allows successfully meet the challenges of detecting and identification signals with SSBSC emitted in the mode of frequency hopping. In order to monitor emission parameters of radios, using frequency hops for SSB signals transmission, it is necessary to measure carrying frequency of every element of radio signal (ERS) with accuracy sufficient for message receive. The required speech intelligibility achieves with accuracy of measurement carrying frequency not exceed 300 Hz. In systems with automatic adjustment reconstruction carrying realize on base of the measurement of the frequency of the main tone. However in signal SSBSC, emitted in FH mode, frequency of the main tone is suppressed by filter of the low frequencies. The results of the studies show that required speech intelligibility may be reached by the use for calculation of the carrying frequency ERS with SSBSC the first formant frequency estimations of the speech signal. In the article is also shown that using the methodics founded on the known methods of FH signal processing and method of the calculation of the carrying frequency ERS with SSBSC allows to solve the problem of their receive and, consequently, emission parameters monitoring.