AIS and Vessel Traffic Services

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AIS and Vessel Traffic Services
Barry Goldman CBE VTS Manager
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• London VTS
• Integration of AIS into VTS
• AIS Strengths and Weaknesses
• Thames AIS

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400 square miles
Harwich

• 95 miles E to W

CENTRAL
Barrier
LONDON
Gravesend
Teddington
Ramsgate
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Four Main Channels
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2 CONTROL CENTRES
Thames Barrier Navigation Control
Centre (Woolwich)
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Thames Barrier Navigation Centre T B N C
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2 CONTROL CENTRES
Thames Barrier Navigation Control
Centre (Woolwich)
Port Control Centre (Gravesend)
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1996 - 2004
Major Refurbishment Feb Nov 2004

• Sofrelog Upgrade -
• (Digital Charting AIS)
• VHF Replacement - interim fit
• Console Based System - limited options

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Port Control Centre London
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3 VTS Sectors
Barrier River
Estuary
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V.T.S. Elements

• Traffic Image
• 15 Radars - outer limits to Greenwich

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VTS Radar Sites
Microwave links
ISDN Back-Up
Enhanced by Automatic Identification System
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Establishing AIS Architecture
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AIS Base Station Network
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AIS Symbology and Presentation
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SYSTEM SPECIFICATION SYMBOLOGY Radar Tracks
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SYSTEM SPECIFICATION SYMBOLOGY AIS Tracks
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SYSTEM SPECIFICATION SYMBOLOGY AIS Tracks
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SYSTEM SPECIFICATION SYMBOLOGY AIS Tracks
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Symbols Scale gt 3 nm
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Symbols Scale lt 3 nm
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Symbols Data Altering Course
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Symbols Data Altering Course
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Tracking Algorithms
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Tracking by Radar
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Tracking by AIS
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Selecting AIS Data
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Selecting AIS Data
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Short Safety Related Messages
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Safety related messages Selection
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AIS Non-Compliancies
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Under way sailing !
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Heading Error
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Fixed Offset
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Significant AIS Defects1 Jan 05 6 Oct 06

• Heading Errors 55
• AIS Unserviceable 37
• Positional Errors 14
• Status/Name/Dimensions 4
• Weak Tx 3
• Total 113

cf - circa 70,000 Vessel Movements
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Inhibit AIS Feature
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Inhibit AIS Track
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PLA radar microwave locations
Enhanced by Automatic Identification System
Estuary Thames AIS Central London and Upriver
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MARCHIONESS 1990 the challenge

• 29 bridges in 14 nm

(Central London 20 bridges in 7 nm)
- ineffectual radar
- restricted visibility
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the objectives

• mutual detection between vessels amongst the
  bridges of central London.
• VTS monitoring.
• Persons On Board (POB) recorded electronically.

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Transponders the obvious solution
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• 2 systems tried 2001-2003 but proved
  unsuccessful immature technology
• 2004-2005 Successful AIS trial with extended
  base station network

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AIS Base Station Network
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• 2 systems tried 2001-2003 but proved
  unsuccessful immature technology
• 2004-2005 Successful AIS trial with extended
  base station network
• Class A Derivative - Class B dismissed
• Consultation and Byelaw for mandatory carriage
  Class IV, V, VI, all gt50gt, Tugs
• Bulk Buy
• Fit by 1 Jun 2007

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Associated AIS Services
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AIS and Vessel Traffic Services Conclusions

• AIS has revolutionised VTS performance
• Reduced Identification Errors
• Improved Target Tracking Reduced Target Swap
• Enhanced Operator Situational Awareness

• BUT
• AIS is Just Another Sensor
• Is at its Best when Correlated with Other
  Sensors
• Should be Treated with Caution if Uncorrelated
• Should used by Trained Operators

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WINDFARMS !
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