| Summary: | With the continuous development of the shipping industry, the shipping traffic density is increasing day by day, and the ship collision accidents are increasing year by year. As the collision of ships will lead to serious losses, people pay more attention to how ships perceive the encounter risks and adopt safer navigation strategies. In order to quantify the risks in the process of ship encounter, this paper proposes a ship encounter risk perception model based on Riemann sphere projection transformation, which projects the relative motion trajectory of Ship as the relative curve motion on the Riemann sphere, constructs the encounter risk model by using the relative velocity and relative distance of the ship on Riemann sphere, and simulates it based on three encounter situations and actual accident cases, and compares the reliability of the model with the traditional fuzzy comprehensive evaluation model based on cases. The results show that the model proposed in this paper can effectively assess the ship encounter risks and creates a more intuitive real-time visual output, which is convenient to assist Ship Anti-collision decision-making. At the same time, it can provide theoretical basis for the inversion of ship collision accidents and the identification of responsibilities.
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