Esa Jukka Kallio¹, Ari-Matti Harri², Anita Taina Aikio³, Arno Alho⁴, Markku Alho¹, Mathias Fontell⁵, Riku Jarvinen^1,6, Kirsti Kauristie⁶, Antti Kero⁷, Antti Kestilä⁶, Juha-Matti Lukkari⁸, Petri Koskimaa⁶, Olli Knuuttila⁹, Johannes Norberg⁶, Jouni Rynö⁶, Esa Turunen³ and Heikki Vanhamaki³, (1)Aalto University, School of Electrical Engineering, Department of Electronics and Nanoengineering, Espoo, Finland, (2)Finnish Meteorological Inst, Helsinki, Finland, (3)University of Oulu, Oulu, Finland, (4)Aalto University, Department of Electronics and Nanoengineering, Helsinki, Finland, (5)School of Electrical Engineering, Department of Electronics and Nanoengineering, Helsinki, Finland, (6)Finnish Meteorological Institute, Helsinki, Finland, (7)University of Oulu, Sodankyla Geophysical Observatory, Sodankyla, Finland, (8)Space Systems Finland, Helsinki, Finland, (9)Aalto University, School of Electrical Engineering, Aalto, Finland