基于双核NIOS的雷达视频记录仪的设计

针对当前雷达系统的应用需求,以雷达视频记录终端为研究对象,对雷达视频记录仪进行数字化、网络化的设计,采用以太网传输,实现雷达图像处理系统的高度集成化、设备的小型化,有效地提高信号的传输和存储质量,延长记录时间并提高数据保存的可靠性,从而达到提高舰载雷达视频处理系统性能的目的。该设计对于研究雷达视频处理系统有一定的指导意义。     

基于视频优化技术的舰船导航交互界面设计

针对舰船航行导航需求,设计基于视频优化技术的舰船导航交互界面。利用导航设备单元内的气象仪、GPS、海图等直接获取导航所需数据,同时利用雷达采集器采集雷达扫描视频,将舰船导航所需数据和雷达扫描视频传输到视频优化单元内和人机交互单元内,视频优化单元对雷达扫描视频与气象仪、GPS、海图等数据进行优化融合处理,得到涵盖气象、海图等数据的雷达扫描视频后。将其发送到主控单元内电子海图控制模块内,同时主控单元连接触控显示屏为用户连接人机交互单元,实现电子海图控制、导航定位管理等。实验结果表明,该舰船导航交互界面具备较好的雷达扫描视频生成能力,电子海图背景海图缩放功能等,应用效果较佳。     

基于以太网的舰载雷达视频传输系统研究

提出一种基于以太网络构建舰载雷达视频传输系统的设计方案,并就其中的关键技术问题,如速率自适应编码技术、传输控制技术、雷达视频组播技术进行了深入探讨.     

舰载视频总线技术及发展

视频总线技术是实现多传感器视频资源共享的新概念,它的基本功能是以总线形式传输搜索雷达、跟踪雷达、电视/红外等视频信号,它的基本原理是多路视频信号调制不同的载波,利用频分传输的原理,用一根同轴电缆传输至各显控台,每个显控台解调恢复出这些信号供给综合显示用,这样可以大大减少整个系统视频信号的传输电缆。     

基于LZW优化算法的雷达数据压缩技术

雷达视频数据在传输过程中必须进行压缩,由于雷达数据的敏感性,压缩过程一般都采取无损压缩。作为一种性能优异的字典压缩算法,LZW算法被广泛应用于当今各类数据压缩领域。针对雷达数据传输高实时性要求以及LZW算法大部分时间花费在字典检索过程的特点,提出一种利用哈希表对LZW算法进行优化改进,从而显著降低检索字典时间的新方法。通过对雷达数据、图片数据和文本数据进行编码并对比各自的编码速度,证实了优化算法的有效性。最后使用真实的雷达数据对该算法进行实际验证,并与游程编码进行对比,得到一些有用的结论。     

一种基于小波变化的自适应阈值算法研究

雷达信号处理在整个雷达系统中一直都起着举足轻重的作用,同时也是雷达技术发展中最为活跃的部分。文章主要探讨小波变换在雷达视频压缩中的应用。针对雷达回波信号这些特点,提出了一种基于小波的自适应阈值方法进行雷达回波信号去噪处理,在保留雷达回波的前提下,降低了雷达数字视频的信息量,为雷达数字视频数据的编码打下了良好的基础。而在雷达图像处理中,嵌入式零树小波算法对雷达图像进行压缩取得了不错的效果。利用所提出的信号去噪方法对雷达视频数据进行预处理后在实时性传输方面具有很高的应用价值和前景。     

船岸一体AUTONET新样机的研制

船岸一体大数据池是新时代的需求，市场上已开发不少采用欧美通信制式的试验系统，但至今未批量应用，主要有4个原因：1）卫星通信传输带宽流量太大，卫星资源远不够用；2）由于卫星成本是天文数字，经济上不可行；3）船岸一体大数据需要视频图像数据传输，流量成本巨大；4）船岸一体大数据需要高性能传输高速大容量，数据响应要达到毫秒级，以有效实现无人驾驶及智能控制，而旧通信制式系统性能远达不到要求。文章对招商局邮轮制造有限公司创新研制的广播同步及数字孪生制式的船岸一体AUTONET新样机进行介绍。船岸一体AUTONET新样机采用“单船30个摄像头+音视黑匣子+雷达+电子海图+一万个实时数据传输”的配置，数据响应为毫秒级，单平台容量达到1.3亿，样机所需卫星带宽小于256 kb，相较于通信制式的样机减少数百倍。船岸一体AUTONET新样机能够实现新时代的船岸一体大数据、无人驾驶及智能监控管理的需求，性能达到国际先进水平。     

雷达模拟视频与电子海图实时叠加匹配算法

由于在利用原有算法进行雷达模拟视频与电子海图实时叠加匹配时,在匹配特征点个数为32～41个的范围内,存在匹配精度较低的问题,因此提出一种新的雷达模拟视频与电子海图实时叠加匹配算法。通过分段线性插值法对墨卡托海图投影进行快速计算,以修正电子海图产生的长度变形。对雷达模拟视频数据实施坐标变换处理,也就是把雷达模拟视频数据的大地投影坐标转变成电子海图的墨卡托直角坐标。以GPS坐标值为依据对电子海图上船舶的定位点进行确定,并将其作为叠加显示雷达模拟视频与电子海图的定位参考点,实现二者的实时叠加匹配算法。通过进行该算法与原有算法的对比实验,证明该算法的匹配精度更高,实现了性能突破。     

嵌入式远程视频监控系统的研究

视频监控系统是安防系统的重要组成部分,是一种防范能力较强的综合系统。本设计在视频监控系统软硬件平台、视频的采集、数据的传输以及终端的显示等方面作了深入的研究,重点讨论了视频信息的采集、视频信息的解编码技术和视频数据的网络传输及客户终端的设计和实现。最后对本系统进行了整体测试,研究结果基本实现了设计所要求的功能,对基于嵌入式的网络视频监控系统的研究具有一定的借鉴参考作用。     

利用AIS数据库实现船舶状态数据监测与挖掘

在现有海上船舶监控系统中,无论是基于雷达信号数据还是视频监控数据,由于信号传输机制及最终信号处理都需要一定时间,其实效性并不高,应用范围也有一定的局限性。AIS(自动识别系统)是一种工作在高频段的自主广播系统,能够实现岸基与船舶、船舶与船舶之间实施交换航行状态、位置坐标以及气象变换等信息。本文在研究现有AIS原理及结构的基础上,基于AIS数据交互提出一种实现船舶状态数据监控的控制平台,并给出仿真结果。     

33rd International Conference on Ocean,Offshore and Arctic Engineering （OMAE2014）

正San Francisco,California,June 8-13,2014.OMAE 2014 is the ideal forum for researchers,engineers,managers,technicians and students from the scientific and industrial communities from around the world to:·meet and present advances in technology and its scientific support;·to exchange ideas and experiences whilst promoting technological progress and its application in industry·to promote international cooperation in ocean,offshore and arctic engineering.In line with the tradition of excellence of previous OMAE conferences,more than 900 technical papers are planned for presentation.Outreach for Engineers Specialty Forum This Specialty Forum is designed for students and professionals who may not be familiar with the Ocean and Offshore industry,as well as those who have just recently specialized in this field.     

Errata

正In the paper"Influence of Fouling Assemblage on the Corrosion Behaviour of Mild Steel in the Coastal Waters of The Gulf of Mannar,India"in Vol.12,No.4,Page:509,References were lost,and the two authors’biographies were identical.The correct text is shown below.We apologize to the authors and our readers for any inconvenience caused by the errors.     

Journal of Marine Science and Application 2014 Sum. Contents

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联合作战计划和执行系统

全球指挥控制系统(GCCS)实施当前美国海军网络中心战信息基础设施的联合计划网络。联合作战计划和执行系统(JOPES)支持GCCS实现联合计划。JOPES有两类计划：时间不限的精密预案计划生成作战计划、方案计划或职能计划；时间敏感的危机行动计划生成作战命令或战役方案。前者在和平时期创建的作战计划是后者的计划基础，加速应付危机的能力。     

Recent progress on wave induced loading measurements in warships

Recent measurements of wave induced hull strain and flexure in RN warships are presented together with the derivation of the current design criteria for extreme hull girder bending loads. The history of the development of the shipboard instrumentation used is given and recent developments to improve the quality and ease of analysis of the data are described. An unexpectedly high transverse asymmetry in the longitudinal strains measured in destroyers is shown to be the result of a combination of vertical and lateral bending in oblique seas. Finally recent theoretical comparisons between the loading of Deep-Vee hulls and conventional UK rounded bilge hulls are presented which demonstrate the higher loading experienced by this type of hull form.     

The 11th International Conference on Hydrodynamics (ICHD 2014)

正19–24 October 2014 SingaporeCONFERENCE THEMES The overall aim of the ICHD Conference is to provide a forum for participants from around the world to review,discuss and present the latest developments in the broad discipline of hydrodynamics and fluid mechanics.The first International Conference on Hydrodynamics(ICHD)was initiated in 1994 in Wuxi,China.Since then,9 more ICHD conferences were held subsequently in Hong Kong,Seoul,Yokohama,Tainan,Perth,Ischia,Nantes,Shanghai and St Petersburg.Evidently the ICHD conference has become an important event among academics,researchers,engineers and operators,working in the fields closely related to the science and technology of hydrodynamics.The 11th ICHD will be held in Singapore in 2014.     

第十二届深水操作会议和展览会(英文)

正November 4-6,2014Moody Gardens HotelConvention Center/Galveston,TX The Deepwater Operations Conference and Exhibition is celebrating its 12th anniversary this year.This growing event will continue the tradition of excellence in addressing operational challenges involved in developing deepwater resources.We will return to the Moody Gardens Hotel and Convention Center on November 5-7,2014 in Galveston,Texas.     

Eastbound or westbound ?

In terms of equal sailing distances, where is the inflexion when ships depart from ports in the Asian Continent to New York via Suez and/or Panama？
The answer is China South Port Group （Hong Kong, Shenzhen and Guangzhou）.     

Impact of regulation on the performances of long-distance transport services: A comparison of the different approaches in Sweden and Norway

Despite the many socio-economic similarities between Sweden and Norway, differences in jurisdiction, organisation, cooperation, and financing of long-distance passenger train and coach services have led to the development of four distinctively different ways of serving the markets. This paper describes how the train and coach markets have developed in the two countries, with emphasis on regulatory and industrial structure and a couple of performance variables.Looking at passenger rail, both countries separated infrastructure from operation over a decade ago. However, while Norwegian rail is characterised by an almost monopoly supplier, rail services in Sweden are partly decentralised to the responsibility of county authorities and are widely subjected to competitive tendering. The rest of the network is about to be opened up for on-the-track competition. Swedish Rail (SJ) has spent the last decades consolidating its core business (passenger rail) and sold out its other businesses. In contrast, the Norwegian state rail (NSB) has expanded its business to become a major bus operator and property owner, with extensions also into the Swedish market.The coach industry was more recently deregulated in both countries. The Swedish coach market is dominated by privately owned companies operating services to and from Stockholm. In Norway, state-owned NSB is a major coach operator on medium distance routes, and is also the largest partner of Nor-Way Bussekspress which totally dominates long-distance coach services. Further, the Norwegian coach market is characterised by cross-ownership and cooperation which has enabled an extensive route network which covers most of Norway.We find distinct differences in achievements in the two modes and in the two countries. Swedish rail services have succeeded in winning market shares and in renewing and developing both infrastructure and service levels to a greater extent than the Norwegian model. On the other hand, the Norwegian coach market seems to be more developed and efficient compared to its Swedish counterpart.The paper concludes with a discussion on the possible links between the different approaches and the performance observed, with the aim to stimulate further and more detailed research on some important issues.     

某海港码头的撞损修复

依据码头撞击受损区域调查检测结果,对受损构件提出合理的修复方案,为码头的安全运行提供保障。