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Multipath Rejection Using Multi-Correlator Based GNSS Receiver in Vector Tracking Loops

Siebert, Christian and Konovaltsev, Andriy and Meurer, Michael (2022) Multipath Rejection Using Multi-Correlator Based GNSS Receiver in Vector Tracking Loops. In: 35th International Technical Meeting of the Satellite Division of the Institute of Navigation, ION GNSS+ 2022, pp. 2042-2053. 35th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2022), 2022-09-19 - 2022-09-23, Denver, USA. doi: 10.33012/2022.18327. ISBN 978-171387136-1.

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Official URL: https://www.ion.org/publications/abstract.cfm?articleID=18327

Abstract

In global navigation satellite systems (GNSSs), multipath propagation is to this day a major source of error. Especially in urban environments, satellite signals are reflected by buildings and other objects, leading to additional delayed signal replicas at the receiver. The frequent blockage of line-of-sight (LOS) signals further increases complexity here. A conventional GNSS receiver relying on scalar tracking (ST) and a delay locked loop (DLL) for the code tracking can only provide inaccurate position estimates under such conditions. Newly arising safety-relevant applications like self-driving cars, unmanned aerial vehicles, but also autonomous maritime vessels in harbor proximity raise demand for high accuracy and reliable positioning. Conventional GNSS receivers with errors of several meters are here insufficient. Vector tracking (VT) is a powerful solution for a reliable positioning in such challenging environments. However, its capability to suppress the effect of multipath propagation is limited and further reduced the more satellites are affected by multipath. Therefore, a VT loop with an integrated multipath mitigation is proposed. This is accomplished with an Extended Kalman Filter (EKF) replacing the DLL discriminator for the code tracking. Its measurement model incorporates the radio propagation channel between satellite and user, inherently accounting for multipath. The joint estimator determines therewith not only the code delay, but also an estimate for the channel impulse response (CIR). A drawback of this algorithm – but also of a conventional DLL discriminator - is, that an unobstructed LOS path is required. Combining this approach with VT overcomes this limitation and reduces the effect of multipath in challenging environments.

Item URL in elib:https://elib.dlr.de/187789/
Document Type:Conference or Workshop Item (Speech)
Title:Multipath Rejection Using Multi-Correlator Based GNSS Receiver in Vector Tracking Loops
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Siebert, ChristianUNSPECIFIEDhttps://orcid.org/0000-0001-7228-5488152054189
Konovaltsev, AndriyUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Meurer, MichaelUNSPECIFIEDhttps://orcid.org/0000-0001-7465-6705UNSPECIFIED
Date:September 2022
Journal or Publication Title:35th International Technical Meeting of the Satellite Division of the Institute of Navigation, ION GNSS+ 2022
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:No
DOI:10.33012/2022.18327
Page Range:pp. 2042-2053
ISBN:978-171387136-1
Status:Published
Keywords:GNSS Receiver, Multipath Mitigation, Multi-Correlator, Vector Tracking
Event Title:35th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2022)
Event Location:Denver, USA
Event Type:international Conference
Event Start Date:19 September 2022
Event End Date:23 September 2022
Organizer:Institute of Navigation
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Communication, Navigation, Quantum Technology
DLR - Research area:Raumfahrt
DLR - Program:R KNQ - Communication, Navigation, Quantum Technology
DLR - Research theme (Project):R - Project Navigation 4.0
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Communication and Navigation > Navigation
Deposited By: Siebert, Christian
Deposited On:08 Dec 2022 18:49
Last Modified:24 Apr 2024 20:49

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