WORKSHOP ON THE FUTURE OF MARINE RADIO- BEACON DGPS/DGNSS

摘要

The Workshop participants considered the various presentations that were made and through discussion it was noted that: 1. IALA recognises the important need to inform the mariner, in a clear and timely manner, if GNSS becomes unreliable; 2. National competent authorities should take decisions based upon the volume of traffic and degree of risk and the need to ensure that integrity information is provided; 3. contemporary GNSS stand-alone services do not provide integrity information to the users; 4. satellite-based augmentation services (SBAS) provides system integrity information, but use the same frequency band as GNSS and are therefore equally susceptible to jamming and spoofing; 5. current implementations of Receiver Autonomous Integrity Monitoring (RAIM) are considered inadequate due to the current lack of maritime specific RAIM algorithms; 6.while the IALA maritime radiobeacon DGNSS concept improves positional accuracy somewhat, its main utility today is the provision of real-time integrity information; 7. the IALA DGNSS concept is globally harmonised and compatible with most shipborne GNSS receivers but there is uncertain levels of use; 8. the IALA DGNSS frequency allocation is recognised as a significant asset in global harmonisation; 9. many DGNSS service providers are facing difficulties in continuing their services with ageing equipment requiring significant investments; 10. some service providers have decided to discontinue their DGNSS services, while others have upgraded their equipment, but the majority have not made up their mind yet and are seeking guidance; and 11. several different architectures are available and can modernise DGNSS implementation in a more cost-effective way.