Automatic Transmitter Identification System (marine): Difference between revisions

Revision as of 12:58, 5 December 2012

Revision as of 13:06, 5 December 2012

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The '''Automatic Transmitter Identification System''' ('''ATIS''') is a [[marine VHF radio]] system used and mandated on navigable inland [[waterway]]s in Europe for identifying the ship or vessel that made a radio transmission. The identity of the vessel is sent digitally immediately after the ship's radio operator has finished talking and releases their transceiver's [[push-to-talk]] keybutton. A short post-transmission message is sent by the radio with the vessel identity and is in the form of an encoded [[call sign]] or [[Maritime Mobile Service Identity]] prefixed with the number '9'.

ATIS use on the [[Trans-European Inland Waterway network]] and connecting waterways is mandated by the Regional Arrangement Concerning the Radiotelephone Service on Inland Waterways (RAINWAT) agreements, which also prohibit the use of [[Digital Selective Calling]] (DSC) where ATIS is required, except in some near-coastal areas, or in sea-like areas of The Netherlands.

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The database of ATIS vessel identities is maintained by the {{lang|nl|Belgisch Instituut voor Postdiensten en Telecommunicatie}}.<ref name="ofcom-atis-faq">{{cite web|url=http://licensing.ofcom.org.uk/radiocommunication-licences/ships-radio/faq/atis-faq/|title=ATIS Licensing FAQ|accessdate=5 December 2012|first1=Raq|last1=Khan|first2=James|last2=Chang|Work=Radiocommunications licences|publisher=[[Ofcom]]}}</ref>

The ATIS digital signal is transmitted on the same VHF channel, at 1,200 baud using [[frequency modulation]] [[frequency-shift keying]] (FSK) between the frequencies of 1,700Hz and 2,100Hz. The core part of the message is transmitted using 10-bit codes; each code being formed of a 7-bit symbol followed by a 3-bit count of the number of zeros in that symbol.<ref name="en300698-1p1">{{cite report|url=http://www.etsi.org/deliver/etsi_en/300600_300699/30069801/01.04.01_60/en_30069801v010401p.pdf|work=ETSI EN 300 698-1: Electromagnetic compatibility and Radio spectrum Matters (ERM); Radio telephone transmitters and receivers for the maritime mobile service operating in the VHF bands used on inland waterways|title=Part 1: Technical characteristics and methods of measurement|issue=V1.4.1|date=December 2009|publisher=ETSI|author=ETSI Secretariat}}</ref>

==References==