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CPA Calculation Method based on AIS Position Prediction

Published online by Cambridge University Press:  19 April 2016

Ling-zhi Sang ,
Xin-ping Yan ,
Alan Wall ,
Jin Wang  and
Zhe Mao
Ling-zhi Sang*
Affiliation:
(China Transport Telecommunications and Information Center (CTTIC), Anwaiwaiguan Houshen Street, Beijing, 10011, P.R China) (National Engineering Laboratory of Transport Safety and Emergency Informatics, Anwaiwaiguan Houshen Street, Beijing, 10011, P.R China)
Xin-ping Yan
Affiliation:
(National Engineering Laboratory of Transport Safety and Emergency Informatics, Anwaiwaiguan Houshen Street, Beijing, 10011, P.R China) (Intelligent Transport Systems Research Center (ITSC), Wuhan University of Technology, 1040, Heping Avenue, Wuhan, Hubei 430063, PR China)
Alan Wall
Affiliation:
(Liverpool Logistics, Offshore and Marine Research Institute (LOOM), Liverpool John Moores University, James Parsons Building, Byrom Street, Liverpool, L3 3AF, UK)
Jin Wang
Affiliation:
(Liverpool Logistics, Offshore and Marine Research Institute (LOOM), Liverpool John Moores University, James Parsons Building, Byrom Street, Liverpool, L3 3AF, UK)
Zhe Mao
Affiliation:
(National Engineering Laboratory of Transport Safety and Emergency Informatics, Anwaiwaiguan Houshen Street, Beijing, 10011, P.R China) (Intelligent Transport Systems Research Center (ITSC), Wuhan University of Technology, 1040, Heping Avenue, Wuhan, Hubei 430063, PR China)
*
(E-mail: sanglz@126.com)
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Abstract

The information on the Closest Point of Approach (CPA) of another vessel to own ship is required in a potential collision situation as it helps determines the risk to each vessel. CPA is usually calculated based on the speed and direction of the approaching ship neglecting the Change Of Speed (COS) and the Rate Of Turn (ROT). This will make the CPA less useful. To improve the CPA calculation, Automatic Identification System (AIS) information containing the Speed Over Ground (SOG), Course Over Ground (COG), COS and ROT is used. Firstly, a model using these four factors is built to predict ship positions better. Secondly, a three-step CPA searching method is developed. The developed CPA calculation method can assist in informing the navigation decisions and reducing unnecessary manoeuvres. Through the analysis of a real collision scenario, this paper shows that the proposed method can help identify and warn of anomalous ship behaviours in a realistic time frame.

Keywords

ShipClosest Point of Approach (CPA)PredictAutomatic Identification System (AIS)
Type
Research Article
Information
The Journal of Navigation , Volume 69 , Issue 6 , November 2016 , pp. 1409 - 1426
Copyright
Copyright © The Royal Institute of Navigation 2016 

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