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Medium frequency R-Mode range estimation with phase locked loop approach

Rizzi, Filippo Giacomo and Grundhöfer, Lars and Gewies, Stefan (2021) Medium frequency R-Mode range estimation with phase locked loop approach. Navigation 2021, 2021-11-16 - 2021-11-18, Edinburgh.

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Ranging-Mode (R-Mode) is a maritime terrestrial navigation system under development, which is supposed to support the mariner with alternative positioning and timing for coastal operations in case the performance of the primary positioning, navigation and timing (PNT) system GNSS is degraded. It uses already existing maritime radio infrastructure for the transmission of synchronized ranging signals. Under consideration are the transmitters of the Very high frequency Data Exchange System (VDES) and the marine radio beacons which are operating in the Medium Frequency (MF) band. Due to different approaches, to use the available bandwidth for the legacy services, both R-Mode implementation differ significantly. This contribution is focused on MF R-Mode. Here the ranging signal is implemented as two aiding carriers that are added in the radio channel of each R-Mode enabled radio beacon. By measuring the phase of the additional carriers, it is possible to estimate the pseudorange to the transmitter site and subsequently calculate the 2-dimensional position. The currently used implementation of MF R-Mode receivers obtain the phase of the two additional signal components based on a Maximum-Likelihood (ML) estimation technique. This approach considers the signal of a given snapshot for the estimation of the phase. Accordingly, the obtained phase is delayed which can cause a reduction of the receiver performance in dynamic scenarios. To reduce the delay of provided phase observation we investigated into the Phase Locked Loop (PLL) which is able to provide instantaneously the signal phase. An important tuning parameter for the PLL is the loop bandwidth which influences the filtering capability and the ranging accuracy. In this contribution we describe in detail our implemented PLL. We show the results of applying the PLL on simulated and real data gathered during a measurement campaign and compare it with the ML approach of phase estimation.

Item URL in elib:https://elib.dlr.de/146221/
Document Type:Conference or Workshop Item (Speech)
Title:Medium frequency R-Mode range estimation with phase locked loop approach
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Rizzi, Filippo GiacomoUNSPECIFIEDhttps://orcid.org/0000-0003-0585-2133UNSPECIFIED
Grundhöfer, LarsUNSPECIFIEDhttps://orcid.org/0000-0002-8650-8280UNSPECIFIED
Gewies, StefanUNSPECIFIEDhttps://orcid.org/0000-0001-5549-8115UNSPECIFIED
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:R-Mode, Range Estimation, Alternative PNT, Phase Locked Loop
Event Title:Navigation 2021
Event Location:Edinburgh
Event Type:international Conference
Event Start Date:16 November 2021
Event End Date:18 November 2021
Organizer:Royal Institute of Navigation
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Transport System
DLR - Research area:Transport
DLR - Program:V VS - Verkehrssystem
DLR - Research theme (Project):V - I4Port (old)
Location: Neustrelitz
Institutes and Institutions:Institute of Communication and Navigation > Nautical Systems
Deposited By: Rizzi, Filippo Giacomo
Deposited On:08 Dec 2021 10:51
Last Modified:24 Apr 2024 20:45

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