Development of a guidance system for safe navigation in rough seas

这项研究工作的主要目标是开发一种用于在波涛汹涌的海面上安全航行的导航系统。研究工作持续了三年，取得了以下五个主要成果。1.硬件组成：系统必须监测天气状况、船舶在波浪中的运动和波浪载荷，以支持恶劣天气下的安全航行。该系统的要求是具有成本效益和耐用。系统应用程序的开发：基于两种预测技术开发了系统应用程序。第一种是随机预测技术，在海军建筑领域被称为“短期预测法”;第二种是贝叶斯估计法。此外，引入合适的 ...更多信息 图形用户界面和作为数据库的数据存储功能，提高了在实际操作中的实用性。3.可行性试验：利用训练船Shioji-maru进行了实船试验，并对系统应用程序进行了修改。结果表明，在实际船舶运行中，船舶运动不能作为一个非平稳随机过程来分析。4.方向谱估计算法的改进：针对上述原因，对方向谱估计算法进行了改进。通过引入TVVAR模型，并对贝叶斯估计方法进行扩展，证明了该方法可以分析非平稳船舶运动和时变海浪谱。5.海上宽带系统：提出了一种新的船队管理概念。实时远程监测系统是利用海事宽带系统开发的，该系统是T.S.Shiojimaru利用通信卫星开发的系统。用于估计波谱的耗时计算可以转移到海岸侧。少

The main objective of this research work is development of a guidance system for safe navigation in rough seas. The research work was continued for three years and following five major results were obtained. According to the results, it can be conclude that the system developed here will contribute to safe navigation of ships.1.Making up the hardware : The weather condition, ship motions in waves and wave loads must be monitored by the system in order to support the safe navigation in rough weather. The requirements of the system are to be cost-effective and durable. The system developed here can satisfy those requirements by reducing the sensors.2.Development of system application program : The system application program was developed based on two kinds of prediction technique. The first one is the stochastic prediction technique called "short term prediction method" in the field of naval architecture and the second one is Baysian estimation method. Furthermore, introducing a suitable … More graphical user interface and a function of data storage as a data base, usefulness in the actual operation was improved.3.Feasibility tests : On board tests were carried out using the training ship Shioji-maru and the system application program was revised. According to the results, it was revealed mat the ship motions can not be analyzed as a non-stationary stochastic process in the actual ship operation. Therefore, the "short term prediction method should not be applied directly.4.Improvement of the estimation algorithm for directional wave spectra : For the reasons mentioned above, the estimation algorithm was modified. Introducing the TVVAR modeling and extending the Baysian estimation, it was shown mat non-stationary ship motions and time-varying wave spectrum can be analyzed.5.Maritime Broadband system : A new concept was proposed for merchant fleet management. The real-time remote monitoring system was developed using the Maritime Broadband system, which is a developing system of T.S.Shiojimaru using a communications satellite. Time consuming calculations for estimating wave spectra can be shifted to the shore side. Less