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Application of AIS in VTS

- Jun 05, 2018 -

Enhance the identification of ships. For the data of own ship's position, course and ground speed, radar obtains the average value of the historical track. AIS obtains instantaneous data. Therefore, the AIS accuracy is higher than the radar accuracy. The radar can only obtain the dynamic information of the ship. When the two ships cross the meeting or the ship is dense, the label exchange or tracking loss often occurs. The information transmitted by AIS includes not only the dynamic information of the ship, but also the static information. There is almost no data loss.

    Improve dynamic tracking capabilities and expand the scope of tracking. AIS data can be received by other AIS stations and repeater stations and receive ship information within the maximum receiving range of VHF wireless communication frequency, and the tracking accuracy is high.

   Integrate and complement VTS functionality.The ARPA (automatic radar plotting aid) for marine navigation equipment provides very limited information and cannot identify the intention of other vessels and vessels, especially in narrow waterways, bends in navigation channels, behind islands, and high vessel density. In the water area and in the case of severe weather and sea conditions, the automatic tracking function has false tracking, loss of target conditions, and even no detection of targets. As the observation distance increases, the accuracy and resolution of the target will decrease. Since AIS uses the VHF band as a wireless communication link, its ability to resist sea waves and rain and snow interference is better than that of ordinary radars, and the ability to capture and track targets is more effective. The communication link of AIS can maintain a good connection and can make up for radar. There are powerless defects in adverse weather conditions. Radar waves can only propagate in a straight line. When the ship is obscured by other ships or tall objects, it forms a blind spot for the radar. AIS can also compensate for this defect in the radar.

    The VTS based on AIS is cost-effective. Because AIS has good remote control performance, a control station can control multiple base stations remotely. A small number of control stations and a large number of base stations can cover a wide area, and the investment of A IS base stations is much lower than that of radar stations. In ports with low traffic density, ships equipped with AIS can form their own “no-VTS” without shore stations; in busy ports, AIS will reduce the workload of VTS operators and make them in traffic management, information services and Improve work efficiency in other tasks.

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