Development of Marine Transport System for Society in the Future

为了防止造成生命损失和环境污染的海上事故，对航行安全的要求很高。人为的错误，如误解或误判，是造成海上事故的原因之一。因此，引入自动导航装置是解决问题的方法之一。另一方面，人工导航在通常拥挤的港口仍然是有效的。在本研究的第一年，自动避碰系统的船舶使用阻塞区的概念。为了评价船舶间的碰撞危险性，引入了阻塞区概念。该系统是基于数值模拟设计的。第二年，对自动避碰系统进行了改进，以实现高效避碰。针对本船周围存在巡航船的情况，对系统进行了改进.在此基础上，研制了由一对真实的实时动态GPS（RTK-GPS）接收机、一台光纤陀螺罗盘和一台PC机组成的实验系统，通过模型试验验证了自动避碰系统的有效性，并在最后一年中，利用阻塞区的概念，开发了船舶在遇到交叉或会车时的避碰算法。通过模型实验验证了系统的有效性。通过模型试验，可以预期该自动避碰系统在交叉口情况下具有避碰能力。

Navigational safety is highly demanded in order to prevent marine accidents which causes losses of life and environmental pollution. Human mistakes such as misunderstanding or misjudgment are one of the causes of marine accidents. Therefore, introduction of automatic navigation devices is one of the solutions for the problem. On the other hand, manual navigation is still efficient at harbor where is usually overcrowded.In the first year of this study, automatic collision avoidance system for ships using the concept of blocking area. The blocking area is introduced in order to evaluate collision risk among ships. The system was designed based on numerical simulations. The scenario which assumes that a ship avoid collision with an anchored ship was adopted to evaluate the performance of the system.In the second year, the automatic collision avoidance system were improved in order to realize efficient collision avoidance. Then the system was enhanced for the situation that cruising ship exists around own ship. Furthermore, experimental system which consists of a pair of Real time Kinematic GPS (RTK-GPS) receiver, a optical fiber gyrocompass and a PC was developed in order to investigate the effectiveness of the automatic collision avoidance system by model tests.In the final year, collision avoidance algorithm for ships which is encountering crossing or meeting ship using the concept of blocking area was developed. Then model experiments were carried out to verify the effectiveness of the system. It is expected that the automatic collision avoidance system has the ability to avoid collision at crossing situation from the results of model experiments.