Annual General Assembly 2003 - Alexandria

Session 10 WGII

A Navigator Decision Support System in Planning a Safe Trajectory

Zbigniew PIETRZYKOWSKI, Jaroslaw CHOMSKI

Maritime University Szczecin, Department of Communication and Sea Cybernetics, ul. Waly Chrobrego1/2, PL-70500 Szczecin, Poland
E-mail: zbip@wsm.szczecin.pl, jarc@wsm.szczecin.pl

ABSTRACT

The problem of safe and effective, i.e. economical handling of a sea-going vessel is connected with collision avoidance maneuvers and voyage planning (route planning) of vessels. In both cases various methods and tools are used for analyzing and assessing a navigational situation as well as maneuver planning and execution. Such actions are aimed at building systems of decision support and automatic ship handling. Authors of such systems increasingly make use of the knowledge and experience of expert navigators. Most often the idea comes down to the expert knowledge implementation in chosen tasks that appear in the process of navigation. The paper presents a navigator decision support system used in planning a safe trajectory. The concept of ship fuzzy domain is used in decision process modeling. The problem of determining a safe trajectory was formulated as an optimal control task. The paper presents a model of a decision process, an optimization algorithm and examples of some maneuvers. The system can supplement and extend the potential of ARPA (Automatic Radar Plotting Aids) systems which are in operation on board ships

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