Design And Realization Of Inbound Pilotage Assist Device

Recently,the world's shipping industry has rapidly developed, which provides an unprecedented opportunity for the development of our country's maritime transportation.However, it also leads to that the port vessel traffic volume continues to increase and the navigational environment becomes more and more complex, which cause that the ship collision accidents occurred more and more often and the managing work of the port traffic's safety is facing great challenges. In order to solve the problems described above, with the continual improvement of the ships' maneuverability, the piloting auxiliary devices which can provide necessary information for pilots to make decision are really effective methods. Also they can reduce the working burden of the pilots and help the ships berth safely, orderly and efficiently. So this study is worthy being investigated and of great practical significance in engineering.Firstly, the status of the research on the pilotage assist devices in this paper are introduced from two aspects: channel pilotage and berthing pilotage, after comprehensively analyzing the demand of the pilot and summarizing the existing problems during the whole process of inbound pilotage. There are two problems needed to be solved: channel pilotage lacking of risk warming information; berthing pilotage needing the real-time berthing motion data. In order to solve these problems, this article expands a general designing plan of this system using the information of automatic identification system and multi-point differential GPS positioning method.Secondly, through the study of the ship collision risk index assessment algorithm and the factors affecting the rick of ship collision in port, this paper puts forward the method of using comprehensive evaluation theory of fuzzy mathematics as the basic algorithm. The experimental results verify the effectiveness of the algorithm and realize the function of quantify the collision risk index.Thirdly, this paper discusses the method of calculating of berthing motion data, after analyzing the control factors of pilotage in the whole berthing process. Based on the berthing coordinate system, this paper gives three kinds of positioning terminal display mode to introduce the berthing algorithm. In addition, the error sources of the model above are also be considered which can affect the calculation result. In order to obtain accurate results, the paper determined the optimal combination of berthing method and display mode of positioning terminal according to the error valve.Finally,this paper designed the software system of the pilotage assist device which achieved the berthing function and design of human-computer interaction interface by VS2003.NET and QT under Windows System. Then, this paper designed the experiments to verify the feasibility of the pilotage assist device. The results of the experiments showed that this device can provide ancillary information for the pilot to achieve the digitized pilotage.