Research On The Key Techniques For Navigation Guarantee Information Service

Navigation safeguard(NS)is an important part of supporting the development of maritime and shipping undertakings,with significant technical and public welfare characteristics.The technical methods studied and used by the NS are important means to ensure the safe navigation of ships,reduce maritime traffic accidents and protect the marine ecological environment.In recent years,with the progress of science and technology,the form of NS has changed,and the services for ships have gradually changed from traditional paper-based and analog to digital.The way of providing digital navigation support information can effectively make up for the shortcomings of traditional navigation books in information timeliness and convenience,and provide convenient guidance and navigation decision-making reference for ships.However,digitalization only solves the low-level needs of crew for navigation safety information,that is,information leaps from paper to machine.This step only changes the carrier form of information,but it can not meet the crew’s high-level requirements for real-time,graphical and on-demand safety information in a variety of scenarios.At this stage,service-oriented operation mechanism of information provision has not been established,and there is information fault between ship and shore.In addition,there are still many key technical problems to be solved in the theory and practice of maritime safety information arrangement,information exchange and visualization,such as the lack of data model / standard based on geographic information,the problem of bandwidth limitation and link screening under the condition of multimode communication at sea,the problem of collaborative processing and visualization of multi-source heterogeneous information,and the single function of Shipborne terminal Information separation.In view of the above problems,this paper adopts a research method combining theory and application.Firstly,it studies and puts forward the basic connotation of intelligent navigation support,and constructs the basic theoretical framework of navigation support information service system.On this basis,it further studies and solves some key technical problems in the process of intelligent interaction and application of NS information between ships and shore.The main research contents are as follows:1.This paper studies and constructs an independent and component-based NS information service operation mechanism,which adopts the service-oriented Pn P(plug and play)method to seamlessly link the components of the mechanism,and intelligently provides the ship with the safety information needed from the berth to the berth.First of all,under the framework of intelligent NS,this paper puts forward the relationship between the basic composition and content of navigation support information service system,and grasps the application scope and application selection principle of different NS information services as a whole;on this basis,it creates a service-oriented navigation information service operation framework,and puts forward the requirements and establishment methods of each component.Secondly,from the perspective of data acquisition,database building and data exchange,the paper studies the infrastructure needed for the effective operation of the system architecture,including the data acquisition and processing technology based on marine spatial data infrastructure and spontaneous geographic information,and designs the standard system and static and dynamic database needed for the operation of the NS information service system.2.Research and create a service-oriented,element-based geographic information data model that conforms to the application of terminal navigation equipment,and provide a consistent framework for data coding,exchange,and fusion processing and visualization application of navigation support information service,so as to realize seamless interaction among electronic chart,maritime safety information and S-100(general hydrographic survey data model)data.3.Research and propose a service classification and coding method that can optimize GMDSS(global maritime distress and safety system)information exchange mechanism.This paper focuses on 16 kinds of digital maritime services summarized in IMO e-navigation strategy,and analyzes and refines the basic contents and service scenarios of NS information services.Based on the geographic information data model,the semi-structured file coding method is used to classify all kinds of services,which can further expand the multi-mode communication fusion information exchange under the GMDSS framework,and meet the communication requirements of mobile Internet,vdes(very high frequency data exchange),NAVDAT(maritime digital broadcasting system)and Beidou short message.Taking three-dimensional high-density water depth data,real-time redundant water depth service,digital navigation warning and other key data service types as examples,this paper analyzes and realizes them,providing reference for other service data arrangement,coding and visualization.4.Research and implementation of the "Internet +" shipborne Electronic Chart Display and Information System(ECDIS),providing intelligent terminal support for landing application of nautical information services.Based on the maximum and minimum scale loading strategy of electronic chart data,the visual difference of S-57 electronic chart is solved.This paper focuses on the key visualization technologies of the new generation of electronic chart(s-101),which are analyzed and tested from the aspects of S-100 graphical expression mechanism,graphical expression directory,rules,symbol library,etc.In view of the confusion of terminal display caused by multi-source heterogeneous information service data,a basic theoretical method of data visual fusion processing based on preset mode and fusion level is proposed,which can support the collaborative display of electronic chart,NS information data and S-100 data.