Detection of coherent-pulse multi-frequency signals 

Dmitriy I. Popov, Doctor of engineering sciences, professor, professor of the sub-department of radio engineering systems, Ryazan State Radio Engineering University named after V.F. Utkin (59/1 Gagarina street, Ryazan, Russia), E-mail: adop@mail.ru 

Background. The detection of coherent-pulse multi-frequency radar signals against the background of the receiver's own noise is considered. The purpose of this research is to synthesize and analyze algorithms for detecting quasi-deterministic and jointly fluctuating multi-frequency signals. Materials and methods. The study is carried out on the basis of statistical methods – calculating the likelihood ratio and analyzing the detection characteristics for the given models of multi-frequency signal. Results. Detection algorithms are obtained for different types of interperiod processing (coherent or incoherent) in frequency channels. In the case of coherent interperiodic processing of individual components of a multi-frequency signal, the detection of a target with an unknown Doppler speed is carried out separately in each frequency channel. In the case of incoherent interperiod processing, detection is performed based on the results of linear summation of the output values of the frequency channels. Conclusions. Based on the analysis of the detection characteristics of the synthesized algorithms, the optimal number of frequency channels is established, at which gains in the signal-to-noise threshold ratio are achieved in comparison with the use of a single-frequency signal. 

processing algorithm, analysis, multi-frequency signal, detection, likelihood ratio, threshold signal-to-noise ratio, synthesis, detection characteristics 

Popov D.I. Detection of coherent-pulse multi-frequency signals. Izvestiya vysshikh uchebnykh zavedeniy. Povolzhskiy region. Tekhnicheskie nauki = University proceedings. Volga region. Engineering sciences. 2022;(1):101–109. (In Russ.). doi:10.21685/ 2072-3059-2022-1-9