Research On Ship Collision Avoidance In Ocean Complex Scene

With the rapid development of maritime trade,the number of ships is increasing,and collision accidents have occurred repeatedly.It not only poses a serious threat to the safety of people's lives and property,but also destroys the marine environment.Therefore,it is very necessary to study the problem of ship collision avoidance.The research work in this paper is about the problem of ship collision avoidance based on the ArcGIS chart data.In this paper,the complex marine environment is analyzed and modeled.The collision avoidance strategy in the corresponding scenario is combined with the improved A*algorithm.Finally,the experiment was executed to verify the effectiveness of the improved algorithm by using the WebGL technology.The main work of this paper includes the following aspects:Firstly,from the whole process of collision avoidance of ships,the complex marine environment is classified according to the different kinds of obstacles,and three different scene models are established.The three models are static scene models based on static obstacles such as sunken ships and reefs,dynamic scene models based on other dynamic shipinformation,and scene models based on the dynamic information fusion of ship information,marine meteorology,hydrology and other dynamic factors.Secondly,In order to build the most complex dynamic scene model,gives a detailed description of the collision avoidance scene,including formal description and structured expression.And the scene model is generated by the program.Then,the problem of collision avoidance is analyzed from the angle of ship collision risk assessment,and a set of collision avoidance decision method based on static scene and fusion dynamic scene is put forward,and the calculation of collision risk in the process of collision avoidance is explained in detail.Thirdly,two classical path search algorithms are compared and analyzed,and the A* algorithm with high search efficiency is selected as the basis of ship collision avoidance algorithm in this complex scene.Then,combined with the collision avoidance strategy proposed in the previous article,the risk function of ship collision is introduced into the evaluation function of the A*.The data information of the global chart obstacle in the static scene is also be taken into consideration.So that the improved collision avoidance algorithm preserves the efficiency of A*algorithm,and it can also carry out corresponding collision avoidance planning according to the dynamic information of fusion.Finally,the effect of the algorithm is show by the WebGL technology.And theefficiency of the algorithm is compared and analyzed as well.Through the above research,from a holistic perspective,the problem of ship collision avoidance has been studied in depth,and the process of ship obstacle avoidance is realized with specific algorithm,which provides reference for the research on the problem of collision avoidance in the future and all kinds of improved algorithms.