Chekunova O. Synthesis of fast–action systems of frequency phase auto-tuning for frequency synthesizers for implementing noise-resilient mode in communication means

Subject of research are the systems of FAT with additional dynamically regulated loop by phase with non–linearities. The purpose of the thesis is acceleration FAT of frequency synthesizers for mode implementation of discrete frequency signals. The following methods have been used: generalized methods of automatic control theory, methods of optimal control, methods for solving linear and non-linear differential equations, correlation theory of random variables, computer simulation methods. Scientific novelty: 1) new systems of FAT with non–linear dependences of gain factor regulation of tuned amplifier were synthesized. The amplifier is set in additional inverse loop of phase control and the non-linearity of the kind arctg(x) and x. This allows accelerating phase autotuning system without deterioration of filtering and accuracy characteristics in tracking mode; 2) first the determination method of basic properties of FAT systems with dynamic regulation parameters of additional loop by phase with non–linear characteristics for frequency synthesizers was developed. The novelty consists in determination of system parameters like dynamic range of phase modulator; optimal gain factor of tuned amplifier and the values of parameter of proportionally integrating filter; 3) the methodology of synthesis of non–linear FAT systems was advanced; its difference from other ones consists in determination of used filter time constants, according to requirements of filter properties; the parameter of proportionally integrating low pass filter, the value of dynamic range of phase modulator at the expense of optimal gain factor of tuned amplifier. The research work results are applied in the Management of communication, the radio engineering maintenance, the automated and information systems of Command of Air Forces of Armed forces of Ukraine, in the Metrology Center of military samples of Air Forces of Ukraine. The degree of realization - branch. The area of application is radio systems.