| It is very important for either marine administration or port navigation enterprises to monitor the vessel. Currently, monitoring vessel is generally performed by radar or VHF voice systems, which can not satisfy the demand of real-time and rapid surveillance. Automatic Identification System (AIS) is an independent, continuous broadcasting system working in the marine mobile VHF band, which exchanges the vessel's identification number, position, direction and speed, etc between vessels as well as between the vessel and the shore. Through the AIS system we can acquire the ship's dynamic and static information and can monitor the ship omni-directionally and real-timely.The vessel real-time tracking system employs the Automatic Identification System (AIS), Electronic Chart Display and Information System (ECDIS) and database technology to control and monitor all vessels equipped with AIS. The data message received by the Monitoring Center through the serial interface will be resolved and then be sent to the AIS vessel database for storage. Meanwhile it will be sent to the Electronic Chart Display and Information System (ECDIS) platform for real-time display from which users could obtain the information about vessels when reading the charts.This paper has introduced the composition of the AIS, the architecture of network system, and the agreement related to the interface information of the AIS, based on which the overall design project of the system has been proposed and the functions of the system has also been categorized. Using Visual C++ 6.0 as the developing tool, we have resolved the AIS information message, with the vessel information conserved in the database employing the ADO interface. Finally, we presented the dynamic and static information displayed on the electronic chart platform as developed by our unit. The system has passed the performance test and we have demonstrated that the system design is rational and meets the design requirements. |
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