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雷达和船舶自动识别系统(AIS)是保证现代船舶航行安全的重要导航设备。针对1部雷达和1部AIS得到的目标航迹进行融合,提出1种基于模糊理论的雷达/AIS目标数据融合方法,采用模糊数学中的正态隶属函数法来进行航迹相关,数据融合则采用参数加权方法,并将融合后数据进行多项式拟合,用以提高导航数据信息的精度与可靠性。通过仿真实例验证了此方法的可行性与有效性。 相似文献
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互联网技术和计算机技术的迅速发展,使大数据和云计算平台逐渐成熟,并应用于多种工业控制和通信领域中。舰船交通管理系统(VTS)可以有效提高船舶航行效率,改善航运交通,但传统的VTS存在精度低、数据处理能力差等缺点。本文针对舰船交通管理系统的信息融合系统进行研究,并基于云计算技术和AIS技术开发了一种新型的VTS信息融合系统。仿真试验表明,基于云计算的VTS信息融合系统不仅雷达信号处理能力强,而且可以进行多任务并行工作,有效改善了VTS的效率。 相似文献
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雷达和自动识别系统(Automatic Identification System,AIS)是配备最多的2类安全助航设备,在海上船舶导航领域发挥着不可替代的作用。由于雷达与AIS提供的信息具有良好的互补性和冗余性,二者融合可以改善探测性能、提高导航系统的精度和可靠性,是近年来海上导航技术的重点发展方向。本文首先介绍雷达/AIS信息融合技术,接着总结其国内外研究现状,并重点阐述航迹关联和信息融合两项关键技术的研究现状,最后提出雷达/AIS信息融合技术发展中待解决的问题,并展望其未来发展趋势。 相似文献
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This chapter presents a summary of the findings of the workshop on ‘Analytical and Institutional Methods and Frameworks’. The paper discusses the nature of the analytical methods used in the papers presented and the purposes for which they were employed, which were generally to either assist in the planning and operation of public transport or to monitor the efficiency and effectiveness of transport services. Subsequent sections examine issues related to data collection and management, and the more general issue of institutional arrangements. Policy and research agendas needed to support further consideration of the subject are then identified. 相似文献
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价值观是指人们对价值的性质标准、构成和评价的基本看法和态度,是指导人的行为的一系列基本准则和信条。构建海事核心价值观是时代发展的要求,更是海事自身发展的需要。 相似文献
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介绍青藏高原多年冻土的冻融特性,并结合我局在青藏铁路十二标段的具体施工,分析了冻土的冻融特性及具体防止措施. 相似文献
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风量与风压的简易测量及应用 总被引:2,自引:0,他引:2
锅炉正常燃烧必须有充足的风量,当锅炉鼓风或引风不足将导致锅炉效果恶化,锅炉出力、热效应率明显下降。结合工程实例,介绍结托管简揭测试鼓、引风系统各部分风压、风量,帮助判断分析工程实际问题的简便方法。 相似文献
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Geoffrey Wood 《Maritime Policy and Management》2004,31(2):157-171
This paper explores the current state of coastal and inland shipping in Tanzania. It provides an overview of the state of ports and shipping in Tanzania, and the reasons underlying the present crisis of competitiveness in terms of both global pressures and national and regional dynamics. Problems of competitiveness are at least partially due to under-investment, management failures, skills shortfalls and difficulties in interfacing with the railway network. Less easy to resolve structural problems include the great imbalance between imports and exports, heightened regional competition and ongoing political instability in the Great Lakes region. 相似文献
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Elizabeth A. Wilman 《Coastal management》2013,41(3):211-230
As the controversy over Outer Continental Shelf (OCS) oil and gas leasing continues, with environmentalists and fishermen seeking to block or delay leasing decisions that they think will adversely affect their interests, the need for better estimates of the environmental costs associated with OCS development becomes increasingly apparent. Although high degrees of precision in such estimates may never be economic, let alone feasible, better knowledge would reduce the uncertainty surrounding the magnitude of such costs, and would make it easier to come to grips with the problem and reduce, if not resolve, the controversy. 相似文献