The Research Of Data Transmission Technology Of Ship Navigation Integration Application

With the Yangtze River busy more and more,Yangtze River shipping is imperative to the modern service industry in transition.To provide better navigation services for the ship,the Yangtze River shipping urgently need establishing the ship navigation integration applications system.In the system,service clients including ship client web-based and application-based,they need exchange the information and transmit dates frequently with the serve.In this paper,according to the need of ship navigation integration system,do a in-depth study of network data transmission technology between client and server.First of all,according to the actual data flow between ship client and server,the system application layer communication protocol is designed and a variety of message types,and file information,ship's static information,ship's dynamic information and supervisory control order structure were also defined,to achieve a reliable,flexible ship client and server exchange of information.Secondly,based on the application-layer communication protocol,the information interaction between ship client and server is achieved by socket technology.Clients need to send connection requests,and server response to connect.In order to obtain navigation services,the nautical chart and notices to skippers and others information should be viewed;the client needs to send the download request,and server response with file download information.Client need to send the ship's static information,and regularly send the ship's dynamic information to the server.The server must send other ships' static information and dynamic information back to the client.In addition,the client can send the emergency signals to the server,and the server can send the client supervisory control or other orders and notices according to circumstances.As the large amount of dater,it needs a special data file transfer technology to download nautical chart and notices to skippers.In this paper,Http and p2p data transfer technologies are used to download nautical chart and notices to skippers from the server for the ship client web-based and application-based.Finaly,realize the ENC data enencryption and protection.Consider the service information for client based on application,as the client application is diversified,the data provided is necessary to adopt open standards format.In order to ensure these standard format data files are safe to use legitimately,it is necessary to protect these files using data encryption.In this paper,use the Yangtze River Electronic Channel Chart S-63 data protection program for the protection of the ENC data.