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船舶导航定位系统对于船舶实现安全航行具有非常重要的作用。当前船舶导航系统在稳定性以及功耗上仍然存在一些问题,本文提出一种基于ARM嵌入式系统的船舶导航定位系统,ARM具有功耗低、处理速度快、具备多种数据接口、实时性好等优点。本文研究了船舶导航定位系统的整体结构,系统可以实现船舶定位、船舶避碰、历史记录等功能,详细设计了串口电平转换电路以及FLASH电路,对NMEA-1083协议进行了简要分析,最后设计了软件的系统界面。 相似文献
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为保证船舶航行的安全性,对传统综合导航平台的技术实现进行分析,提出基于多平台信息融合的导航技术实现方案。在对船用雷达导航系统(Radar Navigation System,RNS)、船舶自动识别系统(Automatic Identification System,AIS)、罗经和计程仪的导航数据进行分析的基础上,设计以数据融合为支撑的船舶导航系统架构,并以实例验证该技术的可行性和有效性。该技术可有效发挥不同平台的导航信息优势,对船舶综合导航系统的优化具有一定的参考价值。 相似文献
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利用多传感器信息融合技术,综合应用高精度GPS定位技术、电子海图信息信息系统、、图像处理技术,船舶自动识别技术、信息融合技术、数据库管理系统等先进技术设计并实现了船舶导航系统,介绍了系统的主要结构、功能以及原理.实践表明,该系统能够满足船舶导航的需要,能够提高船舶航行的安全. 相似文献
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北斗导航定位系统是我国自主研发的一种全球定位和导航系统,被广泛应用在船舶的监控系统和自动识别系统AIS中,本文研究的重点是基于北斗导航系统的上行信道和GNSS差分系统的船舶远程控制系统。由于导航卫星的信号传输过程中受到电磁干扰以及卫星定位的偏差,船舶远程控制系统中的信号存在着一定的误差,为弥补系统的定位误差,本文针对船舶远程控制系统的电磁兼容进行优化和探究,并设计了电磁兼容控制器,详细介绍系统中电磁兼容控制的原理。 相似文献
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《船舶与海洋工程学报》2014,(2)
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. 相似文献
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《船舶与海洋工程学报》2014,(4)
正St.John's,Newfoundland,Canada,May 31-June 5,2015 OMAE2015 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; 相似文献
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联合作战计划和执行系统 总被引:2,自引:1,他引:1
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。 相似文献
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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). 相似文献
The answer is China South Port Group (Hong Kong, Shenzhen and Guangzhou). 相似文献
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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. 相似文献
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桥梁防撞设施物理模型试验 总被引:1,自引:0,他引:1
物理模型试验是预报防撞设施所受撞击力及优化设计方案的主要方法之一。结合杭州湾大桥柔性防撞设施及东海大桥独立式防撞体设计方案,阐述了船—防撞体撞击试验的基本原理、方法、试验方案及相关试验结果。提出了柔性防撞系统的优化方案。试验结果表明,该方案经济有效,可供预报类似桥梁防撞设施撞击力时参考。 相似文献
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印尼某电厂项目码头水工建筑物包括码头、防波堤和护岸等主要组成部分。在该项目水工建筑物的设计过程中,综合考虑当地的自然条件、施工能力和材料来源等因素,不断优化结构选型和结构断面。根据不同使用要求,护岸分别采用直立式和斜坡式2种结构型式,推荐的设计方案节省投资、施工方便,可供同类工程设计参考。 相似文献
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Gunnar Alexandersson Staffan Hultén Frode Longva 《Research in Transportation Economics》2010,29(1):212-218
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. 相似文献