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Performance Bounds for VDES R-mode

Published online by Cambridge University Press:  21 June 2019

Jan Šafář ,
Alan Grant ,
Paul Williams  and
Nick Ward
Jan Šafář*
Affiliation:
(General Lighthouse Authorities of the United Kingdom and Ireland)
Alan Grant
Affiliation:
(General Lighthouse Authorities of the United Kingdom and Ireland)
Paul Williams
Affiliation:
(General Lighthouse Authorities of the United Kingdom and Ireland)
Nick Ward
Affiliation:
(General Lighthouse Authorities of the United Kingdom and Ireland)
*
(E-mail: jan.safar@gla-rad.org)
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Abstract

The Very High Frequency (VHF) Data Exchange System (VDES) is a new radio communication system being developed by the international maritime community, with the principal objectives to safeguard existing Automatic Identification System (AIS) core functions and enhance maritime communication applications, based on robust, efficient and secure data transmission with wider bandwidth than the AIS. VDES is also being considered as a potential component of the R-mode concept, where the same signals used for communication are also used for ranging, thus mitigating the impact of disruptions to satellite positioning services. This paper establishes statistical performance bounds on the ranging precision of VDES R-mode, assuming an additive white Gaussian noise propagation channel. Modified Cramér-Rao bounds on the pseudorange estimation error are provided for all waveforms currently proposed for use in terrestrial VDES communications. These are then used to estimate the maximum usable ranges for AIS/VDES R-mode stations. The results show that, under the assumed channel conditions, all of the new VDES waveforms provide better ranging performance than the AIS waveform, with the best performance being achieved using the 100 kHz bandwidth terrestrial VDE waveforms.

Keywords

R-modeVHF Data Exchange SystemCramér-Rao Bound
Type
Research Article
Information
The Journal of Navigation , Volume 73 , Issue 1 , January 2020 , pp. 92 - 114
Copyright
Copyright © The Royal Institute of Navigation 2019 

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