JCG GMDSS Symposium 2013 NAVDAT : Navigational Data - System Presentation - Pascal OLIVIER NAVDAT Presentation Page 1/35
From analog to digital in maritime radio communications The current analog radio modulation used in the Maritime radio communications: Reduce the usable flow Example: 50 bds for TELEX or NAVTEX In this situation the size of transmit files and transmission duration are limited NAVDAT Presentation Page 2/35
New needs for the ships at sea More frequent information Increase in flow of information Confidentiality of some information Future evolution for e-navigation NAVDAT Presentation Page 3/35
The digital modulation Digital Modulation allows more important flow 15 to 25 kbit/s in a 10 khz channel (more than 300 times the NAVTEX transmission) Faster transmission time per message Transmissions files not limited to the texts but also: Drawings Graphs Pictures Data Text...010101010101110... Multimedia NAVDAT Presentation Page 4/35
Usable radio maritime bands (1) We are looking for a large radio coverage with low cost of investment In the MF band (like NAVTEX 490 / 518 khz) MF Band 500kHz 250kHz 2550kHz 490kHz NAVTEX 518kHz NAVTEX NAVDAT Presentation Page 5/35
Usable radio maritime bands (2) Choice of the MF Band This band procure a stable propagation on surface wave Good radio coverage of 250/350 NM by coast station NAVDAT Presentation Page 6/35
The 500 khz frequency: history (1) Old frequency for distress and security in telegraphy Telegraphy is Suppressed in 1997 Frequency 500 khz not used since NAVDAT Presentation Page 7/35
The 500 khz frequency: history (1) The TITANIC 100 years ago (April 14th, 1912 at 23:40) The TITANIC sent its SOS on 500 khz in telegraphy mode The TITANIC sank on April 15th, 1912 at 2:20 NAVDAT Presentation Page 8/35
The 500 khz frequency: history (2) 100 years afterwards On the French initiative: The World Radio Conference 2012 approved the worldwide exclusive usage of the frequency band 490-505 khz for the maritime mobile service. 100 years after the shipwreck of the TITANIC, the 500 khz is returned to the sailors NAVDAT Presentation Page 9/35
From the 500 khz to the NAVDAT (1) The French company KENTA prepared a first document presented to the Working group 5b at ITU on November 2009. This document described a digital system usable in the 500 khz band Evolution of this document with participation of USA, Denmark and Japan in May and November 2010 Presentation by KENTA of the technical annex in November 2010 describing the test results at sea carrier out on the car ferry PONT AVEN from Brittany ferries. NAVDAT Presentation Page 10/35
From the 500 khz to the NAVDAT (2) KENTA proposes the free name of NAVDAT for the system In November 2011 the ITU-R Study Group 5 adopted the recommendation ITU-R-M [500 khz] which will be published by March 2012 Characteristics of a digital system, named Navigational Data for broadcasting maritime safety and security related information from shore to ship in the 500 khz band NAVDAT Presentation Page 11/35
NAVDAT: General principle Broadcast of digital files from coasts to ships Sequential transmission : like NAVTEX (Also possible on Single Frequency Network SFN ) Broadcast modes: General for all ships Selective: By geographical area By group of ships For a specific ship Possibility of encryption for confidential information NAVDAT Presentation Page 12/35
NAVDAT: System architecture The global architecture of the NAVDAT is similar as the NAVTEX This reduce cost and facilitate the evolution from the NAVTEX to the NAVDAT NAVDAT Presentation Page 13/35
NAVDAT: Synoptic NAVDAT Presentation Page 14/35
Information sources Same as the current NAVTEX system Extended to other services Very open on the future NAVDAT Presentation Page 15/35
Coastal infrastructure of the NAVDAT 500 khz digital transmitter connected to a shore network Transmitting antenna with matching unit Digital Tx KENTA Monitoring receiver 500kHz Tx antenna Monitoring Receiver KENTA NAVDAT Presentation Page 16/35
Technical constraints for coast stations Linearity of the RF transmitter for obtain a good Bit Error rate Respect of the spectrum occupancy Band-width of the antenna (higher than 10 khz) Efficiency of the antenna NAVDAT Presentation Page 17/35
It s a low cost system NAVDAT on the ship Reception antenna like active antenna for electric or magnetic RF field Automatic receiver being able to detect the type of modulations, the level of error corrections as well the broadcast mode Interface to the user: dedicated display or internal network Rx Antenna GNSS Ship Position NAVDAT Receiver Dedicated Display Ship LAN NAVDAT Presentation Page 18/35
NAVDAT advantages The introduction of the digital modulation into a 10 khz band authorizes: Flow rate about 15/ 25 kbit/s (according to the level of error correction used) Possibility to transmit any type of files: Text, Graphs, Pictures, data etc. Automatic reception Very open to the future needs without modifications NAVDAT Presentation Page 19/35
Given as example: Type of messages: PRIORITY Navigational warning NAVDAT functionalities (1) NAVDAT Presentation Page 20/35
Given as example: NAVDAT functionalities (1) Type of messages: PRIORITY Navigational warning Meteorological warning NAVDAT Presentation Page 21/35
Given as example: Type of messages: PRIORITY Navigational warning Meteorological warning Search and rescue NAVDAT functionalities (1) NAVDAT Presentation Page 22/35
Given as example: Type of messages: PRIORITY Navigational warning Meteorological warning Search and rescue Piracy warning NAVDAT functionalities (1) NAVDAT Presentation Page 23/35
Given as example: NAVDAT functionalities (1) Type of messages: PRIORITY Navigational warning Meteorological warning Search and rescue Piracy warning Ices warning For a specific ship (use of the MMSI) NAVDAT Presentation Page 24/35
NAVDAT functionalities (2) Given as example: Types of messages: INFORMATION OF NAVIGATION Meteorological forecast NAVDAT Presentation Page 25/35
NAVDAT functionalities (2) Given as example: Types of messages: INFORMATION OF NAVIGATION Meteorological forecast Local meteorological information Pilot information Tides and Current information NAVDAT Presentation Page 26/35
NAVDAT functionalities (2) Given as example: Types of messages: INFORMATION OF NAVIGATION Meteorological forecast Local meteorological information Pilot information Tides and Current information VTS traffic Aids to navigation status AIS report Cartography of ices and icebergs NAVDAT Presentation Page 27/35
NAVDAT functionalities (3) Given as example: Types of messages: MESSAGES Generals For a geographical zone For a group of ships For a specific ship (use of the MMSI) NAVDAT Presentation Page 28/35
NAVDAT functionalities (4) Given as example: Types of messages: WIDE SERVICES Update of cartography NAVDAT Presentation Page 29/25 29/35
Given as example: NAVDAT functionalities (4) Types of messages: WIDE SERVICES Update of cartography Graph of the traffic evolution on zone Graph of weather evolution NAVDAT Presentation Page 30/35
Given as example: NAVDAT functionalities (4) Types of messages: WIDE SERVICES Update of cartography Graph of the traffic evolution on zone Graph of weather evolution Information to fisherman Harbor messages NAVDAT Presentation Page 31/35
Reception on the ship The receiver is always on watch mode It detects any digital reception in the band 495/505 khz It can automatically decode the received message with modulation of 16 or 64 QAM (Quadrature Amplitude Modulation) and sequential or SFN mode All priority received messages wait for operator validation NAVDAT Presentation Page 32/35
Management of received messages When an encrypted message is received it s necessary to use a key for decoding This management calls upon traditional computer tools with: Validation of received messages Print of message if required Transfer to specific service on board Records of the files NAVDAT Presentation Page 33/35
Conclusion The NAVDAT system : Use a radio band allocated by ITU ( International Telecommunication Union ) for a MARITIME EXCLUSIVE usage on a WORLDWIDE basis Can re-use the current infrastructure NAVTEX for the information sources Simple and safety coastal network System very open on the next future NAVDAT Presentation Page 34/35
Questions and answers Our Partners Pascal OLIVIER KENTA CEO Tel: +33 298 521 602 Email: polivier.kenta@orange.fr NAVDAT Presentation Page 35/35