GPS World, February 2018
ANTENNAS identified in the multiple feed solution b Both a comprehensive and an easier to measure metric for group delay uniformity have been identified providing useful insight for fast comparison of the performance of multiple antennas in terms of GNSS accuracy STEFANO CAIZZONE received a Ph D in geoinformation from the University of Rome Tor Vergata He is is responsible for the development of innovative miniaturized antennas in the antenna group of the Institute of Communications and Navigation of the German Aerospace Center DLR MIHAELA SIMONA CIRCIU received a masters degree in computer engineering from Technical University Gheorghe Asachi Romania and a masters in navigation and related applications from Politecnico di Torino Italy She works on the development of the multi frequency 32 GPS WORLD WWW GPSWORLD COM FEBRUARY 2018 multi constellation Ground Based Augmentation System for DLR b WAHID ELMARISSI received a Dipl Ing in electrical engineering from the University of Applied Sciences Kiel Germany He is responsible for measurement and manufacturing of antennas and antenna electronics at DLR CHRISTOPH ENNEKING received a MSc degree in electrical engineering from the Munich University of Technology He conducts research in GNSS signal design estimation theory and GNSS intraand inter system interference at DLR MICHAEL FELUX is a research associate specializing in GBAS integrity issues for CAT II III operations and program manager for the research on GBAS navigation at DLR He graduated in technical mathematics at Technische Universität München KAZEEM A YINUSA received MSc and Dr Ing degrees in electrical engineering from the Technische Universität München He is a researcher at DLR FIGURE 6 Differential group delay versus elevation angle and frequency each color represents an azimuth value as from measurement for a badly polarized COTS antenna b DLR dual feed antenna c DLR four feed antenna FIGURE 7 Figure 7 Pseudorange bias versus elevation angle each color represents an azimuth value at L1 band for a badly polarized COTS antenna b DLR dual feed antenna c DLR four feed antenna a c a c
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