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Analysis of Position and Timing Solutions for an APNT-System - A Look on Convergence, Accuracy and Integrity

Nossek, Elisabeth and Suess, Matthias and Belabbas, Boubeker and Meurer, Michael (2014) Analysis of Position and Timing Solutions for an APNT-System - A Look on Convergence, Accuracy and Integrity. In: Proceedings of the 2014 ION GNSS+. ION GNSS+ 2014, Tampa, Florida, United States.

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Alternative Position Navigation and Timing (APNT) considers different possible ranging sources like DME, UAT, LDACS, etc… for which multipath is a major threat. Therefore code smoothing with Doppler measurement techniques have been considered in this paper. But ranging errors are not the only issues encountered in APNT; in fact the positioning algorithm needs to be revisited as the linearization assumption for GNSS does not apply for the short range case. Indeed, two problems have been observed while applying the Newton-Raphson approach for the LDACS data collected during the 2012 flight trials: the initial point when taken too far away from the true position prevents the iterative positioning algorithm to converge; and when the initial point is close to the solution but the ranging errors are too large we also observed a convergence problem of the Newton-Raphson algorithm. From this observation, we have decided to investigate the performance of a direct method. A hybrid method taking advantage of both approaches (initial point provided by a direct method followed by the Newton-Raphson method) has been suggested and compared with the stand alone direct method. This paper describes these methods and their performances are assessed based on simulations over Germany using DME stations as ranging source locations. We show that the direct and hybrid methods provide a solution also when the Newton-Raphson algorithm does not converge.

Item URL in elib:https://elib.dlr.de/92998/
Document Type:Conference or Workshop Item (Speech)
Title:Analysis of Position and Timing Solutions for an APNT-System - A Look on Convergence, Accuracy and Integrity
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Nossek, ElisabethElisabeth.Nossek (at) dlr.deUNSPECIFIED
Suess, Matthiasmatthias.suess (at) dlr.deUNSPECIFIED
Belabbas, Boubekerboubeker.belabbas (at) dlr.deUNSPECIFIED
Meurer, MichaelMichael.Meurer (at) dlr.deUNSPECIFIED
Date:September 2014
Journal or Publication Title:Proceedings of the 2014 ION GNSS+
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Keywords:position solution, APNT, backup for GNSS, PVT, LDACS
Event Title:ION GNSS+ 2014
Event Location:Tampa, Florida, United States
Event Type:international Conference
Organizer:Institut of Navigation
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:air traffic management and operations
DLR - Research area:Aeronautics
DLR - Program:L AO - Air Traffic Management and Operation
DLR - Research theme (Project):L - Communication, Navigation and Surveillance
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Communication and Navigation > Navigation
Deposited By: Nossek, Elisabeth
Deposited On:05 Dec 2014 09:23
Last Modified:31 Jul 2019 19:50

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