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Study on Application of UAIS Information Using Directional Antenna

机译：定向天线在UAIS信息中的应用研究

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Now,UAIS has been under full operation for ocean-going vessel over the world,and this system set up all over 500GT domestic vessels in this July and had full operation in Japan.Under the situation,the antenna heights became lower than usual one because small vessels installed the AIS system.By the way,the situation of the AIS data reception trouble begins to be reported as Class-A comes to be enforced completely in this July.So the reception conditions were comparative studied with changing the height of the antenna.The reception troubles or missing reception were increased in case of lower antenna.It is said that the reception rate of the AIS signal loss under the situation as follows;(1) In case that there are interference objects between own vessel and another vessel (VHF has long wave length but there is a possibility that this interference will occur.),(2) In case of multi pass (There are reflections from funnel,mast and other constructions on the vessel,and the wave reflection.),(3) In case that a radio wave collision occur in the same slot.Then,authors tried to improve the certainty of the reception by directing to the fore and aft by using Adcock Antenna for AIS installed on the vessel.As a result,the effectiveness was remarkably increased still in case of the lower height of the antenna because the data that was able to be obtained in the vessel was improved by using the directional antenna.It is concluded that the following points were improved for missing reception,using directional antenna in AIS;(1) The gain of the antenna was increased,(2) Possibility of the slot collision were reduced.
机译：目前，UAIS已在全球范围内对远洋船全面投入使用，该系统已于今年7月组建了500GT多艘国内船，并在日本全面投入使用。在这种情况下，天线高度比平时低了，这是因为小型船只安装了AIS系统。顺便说一下，由于今年7月完全执行A级，开始报告AIS数据接收故障的情况。因此，随着天线高度的变化，对接收条件进行了比较研究。在天线较低的情况下，接收麻烦或接收丢失会增加。据说在以下情况下AIS信号丢失的接收率;（1）在本船与另一艘船之间有干扰物的情况下（ VHF的波长长，但是有可能会发生这种干扰。），（2）在多次通过的情况下（船只上的漏斗，桅杆和其他构造有反射以及波反射）， （3）在同一时隙内发生无线电波碰撞的情况下，作者试图通过使用安装在船上的用于自动识别系统的Adcock天线进行前后对准来提高接收的确定性。在天线高度较低的情况下，由于使用定向天线改善了在船上可获得的数据，因此有效性仍得到了显着提高。结论是，使用定向天线可以改善以下方面的接收丢失问题在AIS中;（1）增加天线的增益，（2）减少缝隙碰撞的可能性。

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