Automatic Identification System (AIS) is a data exchange system which was introduced to improve shipping safety and the possibility of exchanging data, at a country and international level, about ships heading to or from ports, as well as exchanging data relating to passengers and dangerous or environment-polluting cargo carried by ships. The main purpose of introducing AIS was to offer a wider spectrum of available, continuous and reliable navigational data. Apart from being useful for traffic control in a marine area, AIS data can be a very important source of information used in collision avoidance process. However, some reservations are voiced with regard to the unconditional reliance on the data transferred through this channel. The information integrity problem had been raised already at the stage of system implementation and some fragmentary outcomes were published in the past. However, it can be assumed that the results from the system introduction period may not represent reality. Thus, it seems reasonable to base the assessment on theoretical analysis, through the development of multi-criteria model describing the AIS information integrity. The research was performed on data recorded in the period between 04.04.2006 r. and 08.01.2012 r. (selected 55 weeks– 385 days) in the laboratory of Institute of Navigation and Hydrography. Only full 24-hour recordings of AIS signals were selected for the analysis. Fifty five measurement sessions were used to determine the limit probability for availability and integrity exponential of information system, expected value of system lifetime, expected value of system failure time, failure rate, renewal rate. Utilizing homogenous Markov Chains, prediction of the state of availability and integrity of selected AIS information components was carried out. The proposed research approach in many cases gave differentiated results. The research outcomes presented in the paper lead to the conclusion that AIS could deliver useful supplementary information in the process of collision avoidance.
Inhaltsverzeichnis (Table of Contents)
- ABBREVIATIONS AND SYMBOLS
- INTRODUCTION
- DEFINITION OF RESEARCH PROBLEM
- General remarks
- Objectives and thesis dissertation
- SUMMARY OF THE AIS FUNCTIONING
- Introduction
- Idea of AIS introduction
- Information transmitted by AIS used in the dissertation
- AIS network structure of the Gulf of Gdansk
- AIS malfunctions
- REVIEW OF AVAILABILITY AND INTEGRITY METHODS AND TOOLS FOR AIS INFORMATION RESEARCH
- Methods and tools for research of AIS information integrity
- Application of statistic methods to research AIS service information
- Statistical analysis of AIS information in accordance with N.Bailey theory
- End-user satisfaction model
- Research methods and tools of AIS information availability
- Research method of AIS information availability by A.Hori
- Research method (LIC) of AIS availability and coverage area in accordance with Lapinski & Isenor
- Research method (HPC) of AIS availability and coverage area in accordance with Hammond & Peters
- RESEARCH METHODOLOGY FOR ESTABLISHING THE PROBLEM THROUGH AVAILABLE TOOLS AND MODELS
- Preliminary presentation of research models
- General remarks
- Option 1 Method for research of AIS information integrity with the use of Fault Tree Analysis (FTA)
- Option 2 – Method for research of AIS information availability and integrity with the use of Markov Processes
- Definitions
- Stationary distribution
- Remedy research by available models and tools
- General remarks
- Developing data - "post-processing"
- Decoding AIS information
- Assumption for availability research of AIS information
- Availability structure of AIS information – determination of the object study
- Assumption for integrity research of AIS information
- Evaluation completeness criteria of AIS information
- Completeness structure of AIS information – determination of the object study
- Evaluation integrity criteria of AIS information
- Evaluation integrity criteria of AIS message No. 1
- Evaluation integrity criteria of AIS message No. 5
- Preliminary assumptions of integrity research for AIS information
- RESEARCH SOLUTION
- Characteristics of input data
- Research outcomes of AIS binary data availability
- Research method of AIS information availability
- Research outcomes of information completeness concerning true heading
- Research method of AIS information completeness concerning true heading
- Research outcomes of information completeness concerning rate of turn
- Research method of AIS information completeness concerning rate of turn
- SUMMARY, CONCLUSION, DIRECTION OF FURTHER RESEARCH
- BIBLIOGRAPHY
Zielsetzung und Themenschwerpunkte (Objectives and Key Themes)
This doctoral thesis examines the availability and integrity of Automatic Identification System (AIS) information. The primary objective is to develop models and methods for researching the reliability and completeness of AIS data. The thesis aims to contribute to the field of maritime safety and security by improving the understanding of AIS information quality and its potential limitations.- Availability and integrity of AIS information
- Research methods and models for AIS information analysis
- Impact of AIS information quality on maritime safety and security
- Application of statistical methods and Markov processes for analyzing AIS data
- Factors affecting the reliability of AIS information
Zusammenfassung der Kapitel (Chapter Summaries)
- The introduction sets the context for the research, outlining the significance of AIS in maritime safety and security. It highlights the challenges posed by the potential inaccuracies and limitations of AIS data.
- Chapter 1 defines the research problem, outlining the objectives of the dissertation and establishing the research scope.
- Chapter 2 provides a comprehensive overview of AIS functionality, including its principles of operation, the types of information transmitted, and the structure of the AIS network in the Gulf of Gdansk. It also addresses potential malfunctions and their impact on information quality.
- Chapter 3 reviews existing methods and tools for researching the availability and integrity of AIS information. It explores various approaches, including statistical analysis, end-user satisfaction models, and methods based on the availability and coverage area of AIS information.
- Chapter 4 introduces the methodology employed in the dissertation, presenting the selected research models and tools for investigating AIS information availability and integrity. It outlines the steps involved in data preparation, decoding, and analysis, along with the criteria used to evaluate the completeness and integrity of AIS data.
Schlüsselwörter (Keywords)
This thesis focuses on the availability and integrity of Automatic Identification System (AIS) information, utilizing statistical methods, Markov processes, and Fault Tree Analysis (FTA) to assess the reliability and completeness of AIS data. Key themes include maritime safety, information quality, network structure, and potential malfunctions.- Arbeit zitieren
- Krzysztof Jaskólski (Autor:in), 2014, Availability and integrity model of Automatic Identification System (AIS) Information, München, GRIN Verlag, https://www.hausarbeiten.de/document/278255
