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Multipath Rejection Using Multicorrelator Based GNSS Receiver With an Extended Kalman Filter

Siebert, Christian and Konovaltsev, Andriy and Meurer, Michael (2021) Multipath Rejection Using Multicorrelator Based GNSS Receiver With an Extended Kalman Filter. In: 2021 Institute of Navigation International Technical Meeting, ITM 2021, pp. 269-281. Institute of Navigation International Technical Meeting 2021, ITM 2021, 2021-01-25 - 2021-01-28, San Diego, USA. doi: 10.33012/2021.17832. ISBN 978-093640627-5.

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Official URL: https://www.ion.org/publications/abstract.cfm?articleID=17832


Multipath propagation is to this day a major source of error in Global Navigation Satellite Systems (GNSSs), in particular in urban environments. Here, additional delayed signal replicas reach the receiver via one or multiple reflections from nearby obstacles. This causes biased range estimates in conventional receivers leading to Position, Velocity, and Time (PVT) errors. New safety-relevant applications as unmanned aerial vehicles or autonomous cars raise demand for high accuracy and fail-safe positioning systems. Deviations of several meters or outages in these areas are unacceptable. A novel proposal is made for an effective multipath rejection. The solution is based on a multicorrelator receiver using an Extended Kalman Filter (EKF) as an iterative solver replacing the conventional Delay Locked Loop (DLL) code tracking. The underlying signal model of the EKF incorporates the radio propagation channel between satellite and receiver inherently considering the reception of reflected multipath signals. Therewith, not only additional resilience against multipath propagation phenomena can be achieved while performing the code pseudorange measurement, but also an estimate for the Channel Impulse Response (CIR) of the radio channel is obtained. The functionality of the proposed approach has been demonstrated with simulations. A hardware GNSS constellation simulator has been used to test the algorithm under realistic conditions. The performance has been compared against the conventional DLL based GNSS receiver. It turned out that the effect of multipath in the pseudoranges as well as the PVT solution has been widely mitigated. In addition to that, it has been demonstrated that the estimation of the CIR of a radio channel affected by strong multipath delivers promising results.

Item URL in elib:https://elib.dlr.de/138890/
Document Type:Conference or Workshop Item (Speech)
Title:Multipath Rejection Using Multicorrelator Based GNSS Receiver With an Extended Kalman Filter
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Siebert, ChristianUNSPECIFIEDhttps://orcid.org/0000-0001-7228-5488153688265
Meurer, MichaelUNSPECIFIEDhttps://orcid.org/0000-0001-7465-6705UNSPECIFIED
Date:February 2021
Journal or Publication Title:2021 Institute of Navigation International Technical Meeting, ITM 2021
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 269-281
Keywords:GNSS Receiver, Multipath Mitigation, Multicorrelator, EKF
Event Title:Institute of Navigation International Technical Meeting 2021, ITM 2021
Event Location:San Diego, USA
Event Type:international Conference
Event Start Date:25 January 2021
Event End Date:28 January 2021
Organizer:Institute of Navigation
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Communication and Navigation
DLR - Research area:Raumfahrt
DLR - Program:R KN - Kommunikation und Navigation
DLR - Research theme (Project):R - Project Navigation 4.0 (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Communication and Navigation > Navigation
Deposited By: Siebert, Christian
Deposited On:09 Jun 2021 17:20
Last Modified:24 Apr 2024 20:40

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