AIS And Its Key Technology Research

Traffic at sea must aim at navigational safety and efficiency. In order to achieve it , ship's dynamic information and static information are necessarily held by other ships. Today, a ship at sea has to master other ships dynamic information and static information by radar. In this case, a ship can not get other ships name, nationality and etc. So automatic identification system (AIS) comes with communication technique and computer level changing quickly. AIS transponders are intended to automatically provide to appropriately equipped shore stations, other ships and aircraft information, including the ship's identity, type, position, course, speed, navigational status and other safety-related information; to receive such information from similarly fitted ships; and also to monitor and track nearby ships. AIS would work in many aspects such as navigation, communication and observation. It can be able to meet with all types of ships. It also fits most of ships in technique and economy. AIS can make ship technical equipment level and automatic navigation change great. AIS can work by anyone of the two manners that are VHF/DSC and broadcasting. This paper primarily researches the AIS which adopts the broadcasting better applied in future. It is settling harmonious communication among ships equipped AIS that is the key to achieve the AIS adopting broadcasting. In 90s, Self梠rganized Time Division Multiple Access (STDMA) would be brought forward according to Time Division Multiple Access (TDMA). This paper puts forward a set of harmonious communication way basing on STDMA. This paper mainly deals with the problems as follow: on the basis of studying the configuration and functionality of Automatic Identification System, this paper proposes a technical scheme namely Self-organized Time Division Multiple Access (STDMA) to achieve AIS. Based on STDMA, this paper establishes a set of harmonious communications system, and defines corresponding parameters. After emulator testing, the results prove that the harmonious communications system works well. According to the rules of IMO, this paper studies on the format of figure info about ship-dased AIS, and so educe the key capability standards. Based on the analysis of theory and emulator testing, this paper can draw the following conclusions. ( 11 ) It can take not much money to fix the ship-dased AIS by rebuilding current ship navigation equipments; (II) The broadcasting manner adopted by ship-dased AIS can not only meet with the demands of IMO, but have telescopic information structure; (III) By emulator testing, the harmonious communications system based on STDMA can effectively stop not less than two ships transmitting data; (IV) According to the characteristics of the ship-dased AIS based on STDMA, this paper defines corresponding parameters. These parameters will be important to manage the ships within harbor and identify one another among the ships at sea; (V) By the emulator testing of the harmonious communications system based on STDMA and analysis of testing results, it is proved that AIS will have a good development. Du yingjun(Transportation information control and automatization ) Directed by Prof. Wang shiyuan and adjunct Prof. Kong fancun...