1987 Volume 77 Pages 133-139
This report is concerned with an Expert System for Collision Avoidance, as one sub system of an Expert System for Navigation at sea, while an expert system for coping with collision accident was developed as one of the sub system last year, in 1986. In this report, the authors have dealt with the collision avoidance facility in order to generalize the system. The purpose of this system is to provide a captain or a navigator with consultative advices to avoid collision. Two methods to represent the risk level of collision are used; one is the method by the rule-of-thumb and the rule of the Regulations for Preventing Collision at Sea, and the other is the method using the value of TCPA and DCPA. The results of experimental simulations of this system may be summarized as follows. (1) Actions shown by this system to avoid collision agreed approximately with the rule-of-thumb. (2) The time required for one series of inference and display is about 20 seconds per one target.
