Fundamental Study about Collision Avoidance Algorithm- Features of OZT Distribution from Tokyo bay entrance to Sagami wan -

Abstract

Obstacle zone by target (OZT) is a sea area with the possibility of collision with target ships. Collision avoidance of that area will be realizing a safe navigation. Now, many ships do not avoid target ship using OZT, but we expect to apply the collision avoidance system by a distance to OZT calculated of actual ship's OZT.

In this study, 13 sea areas are set at the semi-congested waters near Mikomoto-jima, Izu-Oshima and Tokyo bay entrance, and the distribution of OZT which occurred at every sea areas is analyzed.

The distribution maps are constructed by the ship's heading distance and an occupation angle by OZT, and the features every waters are shown by maps. The distribution that have the peak by ship's heading distance is confirmed, it may be considered the starting time of the collision avoidance action.

In most sea areas, it is confirmed that the peak is 3miles at ship's heading distance, and the distribution decreased suddenly near the 3 miles. It is suggested that ships have any action for collision avoidance when OZT confirmed at ship's heading distance is 3 miles.