A Method for Central Frequency Phase Variations Measurements of GMSK Modulated Signals

The article presents a new method that can be used for phase distortions estimating of signals with GMSK modulation. This algorithm has been tested out using GMSK and MSK model signals. The method is also applied to phase distortion variations measuring of VLF radiowaves propagating in the Earth-Ionosphere waveguide. In this paper we demonstrate a comparison of our modified algorithm and the method of phase reconstruction. The experimental results show that the suggested method has a high accuracy and signal processing speed.