1. Lviv National Polytechnic University, 12 S. Bandery str., 79013 Lviv, Ukraine
2. Lviv Center for Space Research Institute of the NAS of Ukraine, 5A Naukova str., 79060 Lviv, Ukraine
3. Warsaw University of Technology, Institute of Radioelectronics and Multimedia Technology, 15/19 Nowowiejska str., 00-665 Warsaw, Poland
4. Scientific-Research Company ``Electron - Carat'', 202 Stryiska str., 79031 Lviv, Ukraine