e-navigation workshop...page 1 e-navigation workshop update on vdes (vhf data exchange system) and...
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Page 1
e-Navigation Workshop
Update on VDES (VHF Data Exchange System) and how this
can contribute to e-navigation and SAR operations
21/10/2013
Gaetan Fabritius
CLS, Head of Maritime Surveillance Team
www.lrit.fr / www.sat-ais.fr
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Presentation Overview
Introducing CLS
Background on VDES and international context
CLS and VDES
Challenges and way forward
Conclusion
Example of CLS SAT-AIS services
Page 3
Created: 21 April 1986 – subsidiary of the French Space Agency (CNES)
Operating the Argos constellation (Advanced Doppler location)
Core activities:
• Commercial operation of satellite systems for positioning, data
collection, ocean observation and surveillance
• Developing added-value applications and services based on
satellite remote-sensing data;
Applications to:
• environmental surveillance
• sustainable management of marine resources
• maritime surveillance
• oil and gas
Supported by: CUNLOGAN – CLS office in Chile
Introducing CLS (1/2)
Page 4
Introducing CLS (2/2)
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CLS day to day mission
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Background on VDES (1/2)
Increasing need for communication and sharing of information in the
maritime domain (shore to ship, ship to shore, ship to ship)
IMO, IALA and ITU are the leading bodies to regulate (express needs,
ask for new frequencies, define what to do with them, specify technical
requirements, propose regulation updates)
The World Radio Conference (WRC-12) has made substantial
provisions for the maritime community in the VHF band:
- Exclusive utilisation of current AIS1 and AIS2 by the maritime
mobile service in Region 2 and 3 (in 2025)
- Allocation for the mobile satellite service for channels 75 and 76
for long range AIS (new message 27)
- Identification of the channels 27, 28, 97, 88 for testing future AIS
applications, e.g. Application Specific Messages (ASM)
- Identification worldwide of channels 24, 84, 25, 85, 26, 86 for
utilisation of digital systems
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Background on VDES (2/2)
Expanding use of AIS has caused significant increase in VHF Data
Link (VDL) loading which has become an active concern at IMO and
ITU and for maritime administrations in general:
- AIS is well recognized, important tool, effective and useful technology,
SOLAS vessels (Class-A)
- Too much !: AIS SART, AIS MOB, EPIRB AIS, AtoN, non SOLAS
vessels (Class-B), ASM...
- While AIS is a navigation system, not fitted for data exchange
Agenda Item 1.16 for WRC-15: “consider regulatory provisions and
spectrum allocations to enable possible new AIS technology
applications and possible new applications to improve maritime
radiocommunication”
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International context
e-navigation (IMO): “the harmonized collection, integration, exchange,
presentation and analysis of marine information onboard and ashore by
electronic means to enhance berth to berth navigation and related services
for safety and security at sea and protection of the marine environment.”
IMO is now developing an e-navigation strategy implementation plan
with a target completion year for the plan of 2014. Simultaneously, IMO is
now conducting a review and modernization of GMDSS with a target
completion year of 2017. In the discussion of both matters, one of the
common key elements is exchange of information and this will be achieved
possibly by digital data exchange.
VDES could be defined as a technological concept developed to address
emerging indications of overload of VHF Data Link (VDL) of AIS and
simultaneously enabling a wider seamless data exchange for e-
navigation, potentially supporting the modernization of GMDSS, both
processes that are currently developed by IMO.
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Current VDES frequency allocation (draft)
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Possible Roadmap for VDES (draft)
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Challenges and way forward
NAV-58: some delegations already expressed interest for VDES solutions.
NOT a next generation of AIS but a complementary data exchange
system on the VHF bands ensuring backwards compatibility with the
existing AIS system and equipment.
Objectives of VDES: protecting the integrity and future of AIS primary
navigation mission (VDL) & offering new automatic data exchange
capacities for future services.
VDES = terrestrial and satellite (uplink, downlink, 2 ways)
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CLS and VDES
CLS already deeply involved in VDES definition and design at IALA, ITU
and IMO.
Currently under contract with the European Space Agency (ESA) to
complete a preliminary study: service requirements and mission, system,
architecture requirements
Key stakeholders (maritime administrations, space agencies, regulatory
bodies and industry) already involved.
Test bed and demo with terrestrial and satellite prototypes scheduled for
2015/2016.
CLS is inviting administrations to join the on-going study to express their
needs, constraints and expectations.
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Examples of future VDE-SAT services
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Conclusion
VDES is an opportunity for maritime administrations within the
context of e-navigation and modernization of GMDSS.
You are invited to participate in the design of VDES for the benefit
of your future e-navigation and GMDSS services !
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Example of CLS Satellite-based services
(on the VHF band – SAT-AIS)
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From AIS to SAT-AIS
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Principe et Technical Challenges
Protocole: SOTMDA (Self-Organized Time Division Multiple Access):
• Future transmission slots reserved;
• Self-organized cells ~ 40 NM in radius;
• Transmissions as frequent as every 2 s;
• 2 channels, each with 2250 slots per minute;
• 27 message types (static and dynamic information);
• > 70,000 Class-A ships;
NOT designed for reception from space.
SAT-AIS:
• Field of view is large (~ 5000 km diameter, horizon-to-horizon);
• Observation time up to ~ 12 min;
• Many asynchronous SOTDMA cells in field of view simultaneously;
• Transmissions from different cells overlap;
• Receiver strategies required to deal with message collisions.
Need for specific (CLS patented) spectrum processing algorithms to
deal with message collisions: retrieve more messages & focus on a
given ship/fleet of interest when processing the signal.
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EU SAT- AIS Data Processing Center (DPC)
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CLS SAT-AIS Data Processing Center
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Example of data fusion service
Thank you
www.sat-ais.fr
Contact: gfabritius@cls.fr
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