在99年召开的国际海事组织NAV45会议上，通过了在2008年7月1日前所有海上航行的商船必须强制装载“通用船载自动识别系统”的决定。这个新系统包含了一种正在兴起的全新的监视技术——自组织VHF无线数据链路。这是航行监视技术进入新世纪的标志。国际民航组织也决定用它来替代现行的以雷达为核心的空管系统。本文介绍了自组织VHF无线数据链路技术的背景、国际标准和工作原理，提出了标准化数字电文传输的概念及其与自组织数据链路技术的结合，展望了这项新技术在航海领域的应用前景。

Shipbornc Automatic Identification System (AIS) will be an important marine equipment used for dcntification, surveillance and communication in the 21st century, which is currently being rcsearched indeveloped countries. A technioal scheme of AIS is proposed in this paper. The main compoenent of the AIS is a broadcast transponder, and the core technology is a VHF radio data link with highh capacity, named STDMA (Self-organized Time Divison Multiple Access). The ships installed the AIS, which wil automatically and peniodically broadcast their positions and identities in the marine VHF channels, can be eisplayed on a screen of an ECDIS on board or in VTS centers. The AIS is able to support not only broadcast service but also point-to-point communication service.

由大连海运学院电子海图课题组开发的“GPS多目标动态跟踪目动定位监控系统”是集导航星定位技术、计算机通讯技术和图形图象处理技术为一体的高新技术产品。它以GPS定位为基础，通过计算机通讯把装有该系统传感器的运动目标与监控中心联接起来。实现对随机的运动目标的远距离自动跟踪、定位和监控。该系统能在任何气象条件下对纳入系统的被跟踪目标提定位信息，运行状态信息和报警服务。并能将其位置以图形方式显示在配有电子地图的彩色高高分辨率显示器上。该系统这种集海、陆、空运动目标为一屏的显示功能，大大提高了有关部门的联合行动能力，快速的反应能力和安全性。因此，该系统在国民经济建设的众多领域有着广泛的应用前景。

The marine self-organizing VHF data link is a digital radio link with self-organizing ability, which exploits the STDMA algorithm and operates in marine VHF channels. It can support the applications of surveillance, situation awareness and communication. It is the core technology of the Universal AIS which is considered as a future surveillance system at sea by the IMO. In this paper, the operational principle of the marine self-organizing VHF data link is introduced. Simultaneously, a new access protocol is proposed to enhance the marine self-organizing VHF data link so as to support point-to-point communication. The point-to-point communication is one of the most important bases to establish dynamic internetworks among computers on the bridges in the future.