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AIS and Vessel Traffic Services

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Title: AIS and Vessel Traffic Services


1
AIS and Vessel Traffic Services
Barry Goldman CBE VTS Manager
2
  • London VTS
  • Integration of AIS into VTS
  • AIS Strengths and Weaknesses
  • Thames AIS

3
400 square miles
Harwich
  • 95 miles E to W

CENTRAL
Barrier
LONDON
Gravesend
Teddington
Ramsgate
4
Four Main Channels
5
2 CONTROL CENTRES
Thames Barrier Navigation Control
Centre (Woolwich)
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Thames Barrier Navigation Centre T B N C
7
2 CONTROL CENTRES
Thames Barrier Navigation Control
Centre (Woolwich)
Port Control Centre (Gravesend)
8
1996 - 2004
Major Refurbishment Feb Nov 2004
  • Sofrelog Upgrade -
  • (Digital Charting AIS)
  • VHF Replacement - interim fit
  • Console Based System - limited options

9
Port Control Centre London
10
3 VTS Sectors
Barrier River
Estuary
11
V.T.S. Elements
  • Traffic Image
  • 15 Radars - outer limits to Greenwich

12
VTS Radar Sites
Microwave links
ISDN Back-Up
Enhanced by Automatic Identification System
13
Establishing AIS Architecture
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AIS Base Station Network
18
AIS Symbology and Presentation
19
SYSTEM SPECIFICATION SYMBOLOGY Radar Tracks
20
SYSTEM SPECIFICATION SYMBOLOGY AIS Tracks
21
SYSTEM SPECIFICATION SYMBOLOGY AIS Tracks
22
SYSTEM SPECIFICATION SYMBOLOGY AIS Tracks
23
Symbols Scale gt 3 nm
24
Symbols Scale lt 3 nm
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Symbols Data Altering Course
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Symbols Data Altering Course
27
Tracking Algorithms
28
Tracking by Radar
29
Tracking by AIS
30
Selecting AIS Data
31
Selecting AIS Data
32
Short Safety Related Messages
33
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
45
Inhibit AIS Feature
46
Inhibit AIS Track
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PLA radar microwave locations
Enhanced by Automatic Identification System
Estuary Thames AIS Central London and Upriver
50
MARCHIONESS 1990 the challenge
  • 29 bridges in 14 nm

(Central London 20 bridges in 7 nm)
- ineffectual radar
- restricted visibility
51
the objectives
  • mutual detection between vessels amongst the
    bridges of central London.
  • VTS monitoring.
  • Persons On Board (POB) recorded electronically.

52
Transponders the obvious solution
53
  • 2 systems tried 2001-2003 but proved
    unsuccessful immature technology
  • 2004-2005 Successful AIS trial with extended
    base station network

54
AIS Base Station Network
55
  • 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

67
WINDFARMS !
68
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