SBAS use in Maritime

Alan Grant, George Shaw, Jan Šafár, Nick Ward

Abstract:	Satellite Based Augmentation Systems (SBAS) are in place across most of the northern hemisphere and were developed primarily for aviation use. SBAS have the potential to be used in different transport modes, and within Europe, this is being investigated. The European Geostationary Navigation Overlay Service (EGNOS), like its SBAS siblings, provides integrity for and corrections to GPS through data messages broadcast on the L1 frequency, with plans to expand its coverage area and signals used over time. EGNOS is unique though, as it also provides web data services to users via the EGNOS Data Access Service (EDAS). The use of an aviation centric system in other sectors is not necessarily straight forward and full consideration must be given to the different safety cases, formal approval methods and performance requirements, such as integrity and availability, which are transport mode specific. This paper considers the use of SBAS from the maritime perspective and will outline technical and regulatory considerations, as well as provide a review of current developments in the maritime sector that aim to enable the wider use of SBAS in the future. Technical aspects will consider how SBAS can be used in the maritime sector, from a ship and shore perspective, leading to a list of areas which need further investigation. Such items will include questions on which system’s information a mariner should use when marine radiobeacon differential corrections and SBAS corrections are both available. The paper will review some initial work to consider satellite obscuration concerns and will present one potential mitigation option. The paper will also review and discuss the current regulatory position regarding SBAS use within maritime. It will report on the need for guidance to support mariners and international standardisation activities on the use of SBAS systems in a cohesive and understandable manner, reviewing the current position on maritime standardisation, maritime approval of systems and a potential way forward. There is potential for SBAS use to benefit the maritime sector in order to provide integrity and additional accuracy information, however, it is recognised that this can only be realised if its implementation and approval is approached in a clear and holistic manner.
Published in:	Proceedings of the 29th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2016) September 12 - 16, 2016 Oregon Convention Center Portland, Oregon
Pages:	3504 - 3520
Cite this article:	Grant, Alan, Shaw, George, Šafár, Jan, Ward, Nick, "SBAS use in Maritime," Proceedings of the 29th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2016), Portland, Oregon, September 2016, pp. 3504-3520. https://doi.org/10.33012/2016.14601
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