Two-Time Procedure for Calculation of Carrier Frequency of Phasomodulated in Communication Systems. - Oleksandr Leonidovich Turovsky; Vadym Vlasenko; Nataliia Rudenko; Oleksandr Golubenko; Oleh Kitura; Oleksandr Drobyk (Int. J. Commun. Networks Inf. Secur., 2021)