1. Institute of ionosphere (of NAS and MES of Ukraine),Department of Ionospheric Physics,Kharkiv,Ukraine
2. Institute of ionosphere (of NAS and MES of Ukraine),Department of systems for sounding ionosphere,Kharkiv,Ukraine
3. National Technical University “Kharkiv Polytechnic Institute” (of MES of Ukraine),Department of Radioelectronics,Kharkiv,Ukraine