Automatic Transmitter Identification System (marine): Difference between revisions

Revision as of 21:17, 7 March 2013

Revision as of 12:58, 21 September 2013

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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.

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|Workwork=Radiocommunications licences|publisher=[[Ofcom]]}}</ref>

The ATIS signalling protocol is based on that used for [[Digital Selective Calling]] (DSC); with the ATIS transmissions having the format specifier field set to a value of 121.<ref name="en300698-1p1"/>{{rp|44}} While DSC transmissions take place exclusively on Channel 70, the ATIS digital signal is transmitted on the same VHF channel as the voice transmission: it lasts for 285 milliseconds after the PTT button has been released, using [[frequency modulation]] [[frequency-shift keying]] (FSK) between the frequencies of 1,300Hz and 2,100Hz at 1,200 baud.<ref name="report-1159">{{cite report|url=http://www.itu.int/dms_pub/itu-r/opb/rep/R-REP-M.1159-1990-PDF-E.pdf|work=Report 1159: Characteristics of an Automated Identification System for VHF and UHF Transmitting Stations in the Maritime Mobile Service|year=1990|page=150–158|author=Consultative Committee on International Radio Secretariat|publisher=International Telecommunication Union}}</ref>{{rp|150}} 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>