Many maritime DGPS services were installed nearly a decade ago and the differential equipment will need replacement over the next few years. The present system may not meet all the requirements set out in IMO Resolution A.915(22) [1] for Future GNSS and may not meet the needs of emerging applications. The present system is also unable to meet the changes in core GNSS - GPS L2C & L5, Galileo and GLONASS M. A study was carried out for the General Lighthouse Authorities of the United Kingdom and Ireland (GLAs) by Nottingham Scientific Limited (NSL) into the technical, political and economic feasibility of alternative development routes for the GLA DGNSS service. The options identified were replacement of existing hardware with similar, dedicated Reference Stations and Integrity Monitors (RSIM), implementation of the RSIM in software, a Virtual Reference Station (VRS) approach, or some form of integration with Satellite Based Augmentation Systems (SBAS). This paper reports the results of the study and leads on to the implementation of the recommendations, now underway.
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