Motion Model of Planned Target in Marine Simulation System

In marine simulator, trainee controls the position of own ship. The precision of own ship's hydrodynamic mathematical model is relatively high. Usually, there isn't a hydrodynamic model corresponding to the target ships planned by instructor. These target ships navigation along the planned sea route with speed and course set by instructor. The course of ship will change suddenly to another when ship passes a waypoint, so ship's image in visual system will change suddenly. This phenomenon will greatly decrease the fidelity of visual system. This paper introduces a simplified mathematical model of these target ships and how to calculate the beginning position, the instantaneous position, the course and the end position of ships in details. The model has been applied in marine simulation system successfully.