A Modification of the Approach to the Evaluation of Collision Risk Using Sech Function

Jeong, Tae-Gwoen; chao, Chen

Journal of Navigation and Port Research 2007;31(2):121-126.
Published online March 30, 2007.

A Modification of the Approach to the Evaluation of Collision Risk Using Sech Function

Abstract

Evaluation of collision risk plays a key role in developing the expert system of navigation and collision avoidance. This paper presents a new collision risk model formula that is one modification model on the basis of one approach to the evaluation of collision risk using sech function produced in earlier studies. And as a tool of the evaluation field of ship collision, this paper applied the new model in appraising the collision risk and represented how to decide the safe range of own ship's action Moreover this paper also analyzed theoretically how to determine the coefficients as described in the new modification model, and suggested the appropriate values as applicable.

Key Words: Collision risk;Sech function;Distance of closest point of approach;Approach time; Before-action;After-action