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Multipath Rejection Using Multi-Frequency Multi-Correlator Based GNSS Receiver With an Extended Kalman Filter

Siebert, Christian and Konovaltsev, Andriy and Meurer, Michael (2022) Multipath Rejection Using Multi-Frequency Multi-Correlator Based GNSS Receiver With an Extended Kalman Filter. In: 2022 International Technical Meeting of The Institute of Navigation, ITM 2022, pp. 1039-1053. 2022 International Technical Meeting of The Institute of Navigation, 2022-01-25 - 2022-01-27, Long Beach, USA. doi: 10.33012/2022.18200. ISBN 978-093640630-5. ISSN 2330-3646.

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Official URL: https://www.ion.org/publications/abstract.cfm?articleID=18200

Abstract

Multipath propagation is still a major source of error in Global Navigation Satellite Systems (GNSSs), especially in urban areas. Here, satellite signals can be reflected by obstacles in the closer receiver environment, resulting in additional delayed signal replicas at the receiver. As a result, conventional GNSS receivers provide biased range estimates, leading to Position, Velocity, and Time (PVT) errors. The demand for high accuracy and fail-safe positioning is rising, especially for newly emerging safety-relevant applications like autonomous cars and unmanned aerial vehicles. GNSS positioning with deviations of several meters, as it may occur in multipath environments, would be insufficient. Besides multipath, the ionosphere, introducing a frequency-dependent delay to GNSS signals, is a second major source of error. Estimating and compensating for this effect with a state-of-the-art multi-frequency receiver using the ionosphere-free combination is the standard approach. However, the positioning accuracy suffers from multipath errors and amplified noise contributions. Therefore, a novel multi-frequency Extended Kalman Filter (EKF) based algorithm for multipath and ionosphere estimation and mitigation is proposed. The solution relies on a multi-correlator structure which replaces the conventional Delay Locked Loop (DLL) and no longer requires the ionosphere-free combination. The underlying signal model of the EKF accounts for multipath by considering the radio propagation channel between satellite and user. In addition to increased resilience against multipath propagation, an estimate of the Channel Impulse Response (CIR) is obtained. The performance gains achieved using the multifrequency EKF are demonstrated with simulations. A hardware GNSS constellation simulator was used to compare the proposed solution to a state-of-the-art dual-frequency receiver. The results were then verified by processing actual measurements. The proposed method proved to be very effective against multipath. Furthermore, good estimates for the ionospheric Total Electron Content (TEC) were obtained.

Item URL in elib:https://elib.dlr.de/185406/
Document Type:Conference or Workshop Item (Speech)
Title:Multipath Rejection Using Multi-Frequency Multi-Correlator Based GNSS Receiver With an Extended Kalman Filter
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Siebert, ChristianUNSPECIFIEDhttps://orcid.org/0000-0001-7228-5488152108367
Konovaltsev, AndriyUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Meurer, MichaelUNSPECIFIEDhttps://orcid.org/0000-0001-7465-6705UNSPECIFIED
Date:January 2022
Journal or Publication Title:2022 International Technical Meeting of The Institute of Navigation, ITM 2022
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:No
DOI:10.33012/2022.18200
Page Range:pp. 1039-1053
ISSN:2330-3646
ISBN:978-093640630-5
Status:Published
Keywords:GNSS Receiver, Multipath Mitigation, Multi-Frequency Tracking, Ionosphere Estimation, Multi-Correlator, EKF
Event Title:2022 International Technical Meeting of The Institute of Navigation
Event Location:Long Beach, USA
Event Type:international Conference
Event Start Date:25 January 2022
Event End Date:27 January 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:23 Feb 2022 14:55
Last Modified:24 Apr 2024 20:46

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