行動中繼傳輸技術應用於AIS系統之研發

RESEARCH AND DEVELOPMENT OF MOBILE RELAY TRANSMIT TECHNOLOGY APPLIED ON AIS SYSTEM

我國位處西太平洋第一島鏈的中心位置，亦為東北亞海上航運交通之樞紐，優越的地緣位置促使周遭海域上之海洋事務活動頻繁，航行船舶密度及海上交通流量被列為中高類別。有鑒於此，為有效掌握我國所轄海域內之船舶航行動態資訊，本研究針對船舶自動化識別系統（Automatic Identification System, AIS）之傳輸、接收方式進行兩階段的研究，第一階段為AIS接收端天線之效能改善設計，包括接收天線之設計、接收角度與架設場地之規劃等方式，予以提升AIS接收端天線接收效能。第二階段則是以行動中繼傳輸技術的方式延伸AIS資訊覆蓋範圍，透過在海上航行之船舶佈署AIS行動中繼站，並開發AIS行動中繼站之AIS訊號接收擷取及訊號解碼方式，再以中繼通訊方式將接收到的AIS資訊轉傳至岸台，使中繼站具備接收與轉發AIS訊號功能，從而向外延伸AIS的監測距離，藉以建立更廣泛的AIS資訊覆蓋區域。透過本研究成果，期望達到有效監測船舶航行動態資訊，並能更加清楚且全面地掌握我國周遭海域之船舶航行環境狀況，進而提升航行安全。

Taiwan is located in the central of Western Pacific first island chain as well as the marine transport hub in Northeast Asia. Because the superior geographical location promotes the marine activities on the surrounding waters frequently. Therefore, sailing ship density and maritime traffic are classified as high class. Above all, in order to grasp the dynamic information of the sailing ships under the jurisdiction of Taiwan effectively, this project carries out two-stage research on transmission and receiving of the Automatic Identification System (AIS). The first stage improves the performance of the AIS receiving antenna, including the design of the antenna, plans of the receiving angle and base station site to promote AIS antenna effective distance. The second stage is to extend the communication coverage of AIS in the form of mobile relay transmission technology through deploying the AIS relay station on navigational ships and developing the receiving and decoding method of the AIS mobile relay transmission technology. The AIS information is transmitted back to the coast station by RF so as to have receiving and forwarding function, thus extending the monitoring distance of AIS to build a wider communication coverage. Through this project, we hope to achieve effective monitoring of ship navigation information, and more clearly and comprehensively grasp the situation of the navigation environment in the sea area around Taiwan, thus enhancing navigation safety.