Prof. František Vejražka
Future Forces Forum
Faculty of Electrical Engineering, Department of Radioelectronics
Czech Technical University in Prague
Radio Position Determination – Satellite Methods and Opportunity Signals
The radio position determination has been until recently mainly a part of navigation of aircraft and ships. Arrival of satellite methods together with electronics developments and miniaturization have made it serviceable in many sectors of human life. However a permanent desire to have more and more precise position in any case has caused that many new problems have arisen: measured position under a vegetation canopy is not precise enough similarly as in urban canyons, indoor position determination is difficult and insufficiently accurate, etc. The small intensity of radio signals, a change of direction of their arrival by surrounding object are main reasons – so called hard conditions - of this state.
We can improve position determination by support with special signals produced by the reference stations. Their possibilities are limited, too.
But there are in the air even other signals which have potential possibility to serve for position determination. Their common property is the wide frequency band thanks which they can be used for distance measurement and thus for positioning. Such signals are produced by DVB-T, LTE transmitters e.g. The next advantage of these sources is high level of received signals. We call such signals as opportunity ones.
We can be a provider of navigation systems, too and produce own ranging signals of parameters required for precision position determination in hard condition.
Our contribution deals with the opportunity signals and the methods for hard conditions.
1996 Professor, Czech Technical University in Prague (CTU)
1982 Associate Professor, CTU
1972 PhD, CTU
1965 M.Sc., CTU
1960 Electrical Technical School in Pardubice
2001 – 2010 Vice-Rector, CTU
2000 – 2001 Vice Dean, CTU
1996 – present Professor (Full), teacher, researcher, CTU
1994 – 2006 Head of the Dept. of Radioelectronics, CTU
1994 – present Head of the Work Group Radio Systems, CTU
1992 - 1994 Deputy Head of Dept. of Radioelectronics, CTU
1982 – 1996 Associate Professor, teacher, researcher, CTU
1974 - 1992 Executive Secretary, Dept. of Radioelectronics, CTU
1970 – 1982 Assistant Professor, Dept. of Radioelectronics, CTU
2012 – 2019 project manager (Competence Centres Programme, Technology Agency of the Czech Republic
2011 – 2015 member of the Mission Evolution Advisory Group (MEAG) for satellite navigation, European Commission, Brussels
2010 – 2016 Deputy Head, International Association of Institutes of Navigation, London
2008 – present Deputy Head of the European section of the Civil GPS System Interface Committee – International SubCommittee, U.S. Department of Transportation
2005 – 2011 Head of Research Project of Ministry of Education MSM 6840770014 „Research of Prospective Information and Communication Technologies”
2004 – 2006 Head of Czech Participation in project EC FP7 GARDA (GALILEO receiver), Alenia Spacio, Milano, Italy
2001 – present „Action Team“ member, UN - OOSA, Vienna – participation in negotiations to GPS and Galileo systems become closer
2001 – 2006 Head of Project of Ministry of Transportation 802/210/112 „Czech Republic Participation in Galileo Project“
1999 – 2004 Head of Research Project of Ministry of Education MSM 212300014 „Research in information technologies and Communication” of prospective information and communication technologies”
1996 – 2001 Head of Czech participation in Copernicus project No. 708 – Terrestrial and Space Communication Network, EC
1995 – 1997 Head of Project “Implementation of GPS in Czech Army”, General Staff of Czech Army – Topography Service
1992 – 1995 COST project No. 227 – Terrestrial and Space Communication Network, EC, Brussels
1991 – present Member of Civil GPS Information Service Committee – International Information Sub-committee (committee in a structure of US Department of Transport)
1990 – 1995 DGPS reference station development, CTU
1984 – 1990 development of GPS receiver prototype for Mesit, Uherské Hradiště
1981 – 1984 author of the project of equipping an aircraft L410 with Omega receiver, VZLÚ Praha