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To address the real-time applicability and reliability of traditional collision risk index calculation models. The quaternion ship domain model, safe encounter distance model and ship dynamic boundary model are introduced to build the safe navigation distance model. Select the distance to closest point of approach (DCPA), the time to reach the distance to closest point of approach (TCPA), ship spacing, the azimuth angle of the incoming ship relative to the ship, and the ship speed ratio between the two ships as collision risk index evaluation indicators. When evaluating the distance between DCPA and the ship, use the navigation safety distance model to divide the danger level into different numerical ranges, in order to achieve the goal of being suitable for the captain of the corresponding ship, and calculate in real-time based on the ship speed of the ship, Finally, the fuzzy set theory is used to establish the ship risk collision model. Simulation experiments were conducted in a situation where a single ship and multiple ships intersect. the results indicate that the established model can accurately calculate the collision risk index and trend of ships, remind drivers to pay more attention to more dangerous ships, and also assist the maritime supervision department in supervising and reminding the sailing ships.
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