Formation the radio signal for the system of space-time signal processing

Yuri Gelozhe,Aleksander Maksimov,Pavel Klimenko,P Yermolov

doi:10.1051/itmconf/20193003011

Abstract

The work is devoted to digital information transmission systems using space-time signal processing. The formation of radio signals whose carrier frequencies are determined by the frequency-time matrices is considered. The signal shaper is based on a PLL system with a programmable frequency divider. The analysis of the processes in the phase automatic system under the influence of large destabilizing factors and frequency switching of the generated oscillations is carried out. It is theoretically and experimentally shown that in the above-mentioned conditions the automatic system may lose stability. The algorithm for controlling the PLL has been developed, which ensures the stability of processes under large disturbances. Experimental studies have been carried out that have shown the efficiency of the improved system.

Highlights

The formation of radio signals, the parameters of which are determined by the frequencytime arrays [1, 2], is considered
For the considered PLL system with a periodic characteristic of a pulse-phase detector (PPD), the probable loss of stability is due to the presence of a dangerous attractor in space, which is a limiting cycle that is stable
The differential equation of the PLL system with the periodic characteristic of the PPD and the single-link RC-LPF has the form [3]

Summary

Introduction

The formation of radio signals, the parameters of which are determined by the frequencytime arrays [1, 2], is considered. The signal shaper is based on a PLL system with a programmable digital frequency divider [3]. For the considered PLL system with a periodic characteristic of a pulse-phase detector (PPD), the probable loss of stability is due to the presence of a dangerous attractor in space, which is a limiting cycle that is stable. In the system that has lost its property, stability of stable autooscillations developing, the system cannot get out of this undesirable mode on its own. In this connection, the task of controlling the processes in the PLL system, which bring the system into the domain of the target attractor, is of current interest

Classic PLL

TF d dt h TF

Formulation of the problem

Process control algorithm in the PLL system

Experimental study of the PLL with additional process control

Conclusion