Author: Admin
Last saved by: Student
Company: Microsoft

Specialization: 010700/19 “Physics”
Program: “Wave processes and methods of their study”
Head of the program: Makarov G.I.
Department of Radiophysics
Scientific adviser: docent, PhD Gherm V. E. , lecturer, PhD Zaalov N.Y. 
Рецензент: prof., Dr. Sci. Zernov N.N.

Investigation of the regular and statistical characteristics of HF-radio channel employing Doppler method
S. A. Dolgatchova 

To investigate the regular and statistical characteristics of HF signals, a series of measurements have been undertaken over two paths. The receiver system is deployed in St.Petrsburg, while transmitters are located at Moscow (650 km) and near to Arkhangelsk (750 km). Receiver system includes 3 digital tuned receivers with analog output. The output  signal at intermediate frequency 215KHz was sampled by ADC Lcard-783. After filtering and decimation in real time the signal was recorded on PC. The next proccesing of the signal was carried out in MatLab.  The dynamic spectra of the signal explore in order to separate the different modes of propagation.  The time series of the Doppler frequency of the signal was proccessed by FFT. The parameters of this spectra correspond to the parameters of spatial spectra of the electron density inhomogeneties. The comparison of the simulated and measured  signals has been carried out based on calculated characteristics of radio channel for some particular dates.

The list of the publications:
Долгачева С.А. “Исследование доплеровских спектров КВ сигналов” − XV Всероссийская научная конференция студентов-радиофизиков, 2011.