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Measurement and Modeling of the Aeronautical Channel for Galileo

Lehner, A. and Steingass, A. and Fontan, F. and Kubista, E. and Martin, M.J. and Arbesser-Rastburg, B. (2004) Measurement and Modeling of the Aeronautical Channel for Galileo. In: Proceedings ENC-GNSS 2004. European Navigation Conference GNSS 2004, Rotterdam, The Netherlands, 17-19 May, 2004, Rotterdam, The Netherlands.

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Power, delay and bandwidth of reflections at aircraft structures are not modelled accurate enough for new GNSS signal structures. For that reason ESA commissioned a contract about a measurement campaign in 2002. Only reflections which arrive shorter than the chip duration mainly contribute to the positioning error of a navigation receiver. This nature of the system made it necessary to measure the channel with an extremely high bandwidth of 100MHz, which results in a time resolution of 20ns, enhanced down to 1ns by using a super-resolution algorithm. The most important scenario for this channel type is the final approach. In the experiment we used an aircraft (Pilatus Porter) as the transmitting platform. The receiver was mounted in the 25m span experimental jet VFW-614 approaching Thalerhof airport of Graz/Austria. In a second step a helicopter as transmitter circled the parked VFW-614, while reflections on the plane were measured. To allow extensions of the measurements to larger aircrafts, the ground measurements were repeated with an Airbus A340. Evaluating the measurement data we were able to disprove the existence of a significant wing reflection. Due to the large bandwidth of the measurement we have been able to detect and model a strong, short delayed reflection on the fuselage, whose narrow bandwidth makes it nearly impossible to suppress its influence by averaging. As second contribution to the multipath channel the ground reflection was detectable. It was modulated by the changing terrains reflectivity and was Doppler shifted according to the aircrafts movement. We were able to correlate the Doppler shift with the sink rate. This achievement was used to model the ground echo properly. To gain more precise results, physical optics simulation was used to verify the measurements and proof the existence of the fuselage echo. We will present channel models for both aircrafts.

Document Type:Conference or Workshop Item (Paper)
Additional Information: LIDO-Berichtsjahr=2004, monograph_id=No. 79,
Title:Measurement and Modeling of the Aeronautical Channel for Galileo
AuthorsInstitution or Email of Authors
Fontan, F.Universidad de Vigo, Spain
Kubista, E.Johanneum, Graz, Austria
Martin, M.J.Universidad de Vigo, Spain
Arbesser-Rastburg, B.ESA, Noordwijk, The Netherlands
Journal or Publication Title:Proceedings ENC-GNSS 2004
Refereed publication:Yes
In ISI Web of Science:No
Keywords:Multipath, Model, Channel, Aeronautical
Event Title:European Navigation Conference GNSS 2004, Rotterdam, The Netherlands, 17-19 May, 2004
Event Location:Rotterdam, The Netherlands
Event Type:international Conference
Organizer:Netherlands Institute of Navigation
HGF - Research field:other
HGF - Program:other
HGF - Program Themes:other
DLR - Research area:no assignement
DLR - Program:no assignment
DLR - Research theme (Project):other
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Communication and Navigation
Deposited By: elib DLR-Beauftragter
Deposited On:16 Sep 2005
Last Modified:06 Jan 2010 21:31

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