CALL FOR PAPERS
Prof. Ing. Frantisek Vejrazka CSc.
Czech Technical University
The contribution gives an overview of present and future navigation systems and their augmentations as GPS, GLONASS, GALILEO, WAAS, EGNOS, MSAT, QZSS, BEIDOU, GAGAN. Performance of systems depends on technical parameters and we will try to evaluate it and to present our opinion on advantages of them for different applications and in various situations (reception of week signals suffering from great attenuation under vegetation canopy, in urban canyons, influence of reflections and multipath).
The last part of contribution deals an application of software radio technology for user receiver design and results obtained from experiments with different algorithms of processing of satellite navigation systems signals.
About the Invited Speaker:
Professor Vejrazka born 1942. He graduated (Ing. - MSc.) at the Faculty of Electrical Engineering of the Czech Technical University in Prague, Czech Republic 1965 and obtained CSc. (PhD.) degree 1972. He served as Assistant Professor (1970) and Associate Professor (1981) of the Department of Radio Engineering. He is Full Professor of radio navigation, radio communications and signals and systems theory since 1996. He was appointed as Head of Department of Radio Engineering in 1994, Vice-dean of the Faculty in 2000 and Vice-rector of the University in 2001. His main (professional) interest is in radio satellite navigation where he participated on design of the first Czech GPS receiver (1990) for MESIT Instruments factory. His team at the Faculty has been a provider of the experimental DGPS reference station which has disseminated DGPS corrections through FM RDS and VLF systems. Prof. Vejrazka published 11 textbooks, more then 200 papers on conferences and many technical reports. He is former president of the Czech Institute of Navigation, Fellow of the Royal Institute of Navigation in London, member of the Institute of Navigation (USA), CGIC/IISC, IEEE, member of Editorial Board of GPS World, etc.
Professor Wasyl Wasylkiwskyj
Department of Electrical and Computer
This paper presents results of ongoing research to develop a passive transportable system for measuring the range and bearing of RF emitters in the PCS band (1850-1910 MHz). Among several possible candidate approaches that were considered in the initial stages of the program the one chosen for further development employs emitter signal direction-of-arrival (DOA) information measured with two array antennas whose phase centers are displaced by a known distance (baseline). In keeping with the transportability requirement of the system one of the key objectives was to minimize the baseline while maintaining good range estimation accuracy. The design goal was set for a baseline on the order of 1m while accommodating emitter ranges up to 1km. This translates into a DOA estimation accuracy of better than 0.1degree. To achieve such accuracy levels novel DOA algorithms and antenna array design approaches are employed.
The design approach and system performance evaluation will be presented using numerical simulations of a dual 4-element patch array together with the associated RF and DSP components. A data collection system incorporating the patch antenna array was designed and built and is currently being used to validate the theoretical predictions. Preliminary results on range estimation accuracy and bearing indicate excellent agreement with theory.
About the Invited Speaker:
Wasyl Wasylkiwskyj received his BEE degree from the City University of New York in 1957 and the MS and Ph.D. degrees in electrical engineering from the Polytechnic University (New York ) in 1965 and 1968, respectively.
Since 1985 he holds the position of Professor of Engineering and Applied Science at the George Washington University, Washington, D.C. His current research interests are in numerical electromagnetics, phased array antennas, signal processing by array antennas for wireless communications and direction-of -arrival estimation.
During 1980-1985 Dr. Wasylkiwskyj served as Vice President and General Manager of Physical Dynamics, Inc where he led the Electrophysics Division with principal activities in the areas of airborne remote sensing of the ocean, synthetic aperture radar imaging of ocean waves, passive (in-situ) and active magnetic detection of ocean currents.
Between 1969-1980 he was on the Research Staff Member of the Institute for Defense Analyses in Washington, DC where he initiated and participated in DOD sponsored studies encompassing a wide range of problems in the general area of electromagnetics: antenna systems (in particular, phased array antennas), electromagnetic wave propagation and antennas in dissipative media (subsurface antennas); optimization of scattering and radar cross section of antennas; effects of atmospheric turbulence on propagation of laser radiation, as well as problems associated with optical imaging. In addition, served as task leader of several system studies of fairly broad technological scope pertaining to tactical as well as strategic weapon systems of interest to ODDR&E.
Dr. Wasylkiwskyj is a Fellow of the IEEE and has over 50 publications in the general area of electromagnetics and antennas and propagation.