The capacity of transportation corridors on roads and rails are now pushed to the limit in Europe. Therefore it is essential to modernise waterway infrastructure throughout the continent to support co-modality and to offer an alternative for the transportation flow of goods and people. River Information Services (RIS) in general and DoRIS (Donau RIS) in particular, represent the most substantial infrastructure modernisation over the past decades. The core function of DoRIS is to record and display vessels on an Electronic Navigational Chart (ENC) containing the most important nautical information concerning the waterway and traffic regulations. AIS transponders are key elements of DoRIS. AIS stands for 'Automatic Identification System' and enables to identify the current position of the vessels using global positioning systems (GPS). It is a system in which ships continually transmit their ID, position, course, speed and other data to all other nearby ships and shoreside authorities on a common VHF radio channel. To enhance the positioning quality DoRIS also provides DGPS (differential GPS) corrections to the users utilising the AIS data link. The local broadcasting of DGPS correction data for position augmentation is done by the DoRIS base stations which transmit the corrections on the Message 17 of the standardised Inland AIS protocol. At the moment no DGPS performance monitoring is in place limiting the trustability of the systems as malfunctions can not easily be detected. Due to shortcoming a feasibility study has been initiated. This work was not straightforward as no regulations for AIS DGPS monitoring on inland waterways exist at present. The existing standards from IMO and IALA for the maritime community should be the basis for this implementation and should help to define new AIS DGPS monitoring standards for inland waterways and future certification of the monitoring system. After definition of a monitoring system concept, existing and needed hardware were evaluated. An innovative software is being developed to monitor the GPS correction values generated by the base station. Additionally the transmission of the corrections through the air is monitored through an independent loop using an AIS monitoring receiver.


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    Title :

    DGPS performance monitoring of DoRIS


    Additional title:

    DGPS-Leistungsüberwachung von DoRIS


    Contributors:


    Publication date :

    2007


    Size :

    12 Seiten, 6 Bilder, 2 Tabellen, 5 Quellen


    Type of media :

    Conference paper


    Type of material :

    Storage medium


    Language :

    English




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