【作者】 霍伟；

【导师】 刘人杰；

【作者基本信息】 大连海事大学 ， 通信与信息系统， 2003， 硕士

【摘要】 船舶交通管理系统(VTS，Vessel Traffic Services)是一种旨在改善船舶交通安全、效率，保护海上环境的服务系统。它的发展适应了水上交通运输的迅速发展及船舶密度急剧增加的需要。 雷达子系统是VTS系统的重要组成部分。雷达利用电磁波反射原理收集监测海域内的物体回波信息，雷达原始视频数据实时动态地反映了海域内的真实情况，因此对于交通管制和海事取证具有极其重要的作用。但是雷达原始视频信号频谱很宽，要求传输设备有很宽的通频带，而且效率低、投资大。因此为了充分利用原始视频信息，同时满足传输带宽的要求，必须对雷达原始视频信号进行压缩。 随着信息时代的发展，以计算机为中心的多项技术在VTS系统中得到广泛的应用，使VTS系统朝向通用化、软件化和集成化的方向发展。现代VTS系统对多源信息的统一处理与表现、开放的系统结构和高效灵活的人机交互等方面的要求越来越迫切。 结合VTS系统的现实要求和发展方向，本文从VTS雷达原始视频图像数据的特点出发，从信息论中关于数据压缩的基本原理出发，从现代信号处理特别是图像信息处理领域中的压缩编码国际标准出发，提出了雷达原始视频编解码系统方案，其主体部分——编解码器是在PC机内利用压缩软件实现，阐述了系统工作流程；提出了基于JPEG压缩算法和H．263压缩算法的雷达图像编码方案，分析了编解码算法；进行了仿真试验，在实验结果的基础上分析了编码算法压缩雷达原始视频图像的可行性和有效性。更多还原

【Abstract】 VTS(Vessel Traffic Services) system is aimed at improving vessel traffic safety, efficiency and protecting seas environment. Its development is to satisfy the increasing requirements caused by the rapid development of waterborne traffic and the rise of vessel density.Radar sub-system is an essential part of VTS system. It can get the information of the objects in its supervised water area by collecting the reflected electromagnetic wave. Because the raw radar video represents the real condition of the supervised water area, it is an important information resource for VTS centers and maritime administrative offices to get the evidence on the spot. But the bandwidth of the raw radar video is too wide to transmit directly in the common communication channel. Therefore, it is necessary to compress the raw radar video before transmission so as to satisfy the channel bandwidth.Furthermore, computer-based technologies have got widely used in this rapidly developing information era. Modern VTS is growing to be a system with uniform abilities to process and represent every kind of information, open system structure, and highly efficient man-machine interactivity.Considering practical needs and developing trend of VTS, based on analyzing the signal characters of VTS radar video, studying basic data compression principles in Information Theory, comparing international coding standards in the forefront of image processing, a VTS radar video coding system suitable for transmission in the narrow channel is proposed in this thesis. Its main block梒oder and decoder, is realized in the common PC with software. The working process is demonstrated detailed. Two coding schemes suitable for compressing radar image are also proposed, one based on JPEG algorithm and the other based on H.263 algorithm. Finally, the simulation is conducted, and the feasibility and practicality are analyzed based on the results of the experiments.更多还原