Ship’s optimum safe trajectory in a collision situation of passing many moving targets in fuzzy environment

Abstract

Ship safe sailing consists in continuous observation of the situation at sea, determination the anticollision manoeuvre, if necessary, the realisation of it and safe voyage to a point of destination. So it is necessary to determine ship safe trajectory as a sequence of ship course changing manoeuvres. Each manoeuvre is undertaken on the basis of information obtained from the anticollision system. In this paper safe ship control in a collision situation is presented with taking into account passing many moving objects, considered as multistage decision-making process in a fuzzy environment. A branch-and-bound method is used to determine optimum safe trajectory of the ship according to the International Rules of the Road at Sea.