海上中/高频数据通信调制器的原理和功能

为尽快在中/高频段海上移动业务(MMS)中引进新的数据通信技术,需要研究正交频分复用(OFDM)技术在海上中/高频段的应用.中/高频数据通信调制器是将来在海上高频波段进行数据通信的全新的关键部件.海上中/高频数据通信调制器的原理和功能的分析和研究填补我国目前在该项技术上的空白.对我国海上通信的发展和船岸设施升级改造有着极其重要的指导作用.     

利用长距离WiFi技术解决船岸数据通信实测分析

在海洋经济繁荣发展,信息技术日新月异的时代,实现船岸之间的低成本高速率数据通信是时代的呼唤。本文通过在厦门湾进行长距离WiFi技术的通信实测,分析利用该技术实现船岸数据通信的可行性和改善空间。     

船舶通信A/D转换器中低噪声前置放大器设计

长期以来,船岸之间的数据通信仅仅局限在传真、电话与电报等诸多模拟传输手段方面。而近年来,伴随无线通信技术的进步与发展,使得船岸间的数据传输路径得以转变。在这一背景下,能够与船岸之间的数据通信业务需求相适应,但在传输相同数据的过程中,也可以选用不同的传输设备。本文重点优化了船岸数据综合传输系统,提高了低噪声前置放大器的数据传输能力,使得既有通信设备得到整合,减少船舶的营运成本,一定程度上提升了船舶的安全性。     

船岸数据通信装置信号线电磁辐射分析

为保证船岸数据通信装置稳定性，减少电磁辐射，提出优化设计方法，将船岸通信装置中印制电路板(Printed Circuit Boards, PCB)串口、SD卡信号线进行建模，通过仿真得出信号线的S参数、串扰等数据，进行多种信号线的电磁耦合特性分析。研究结果表明：通过对PCB重新布局设计，将重新设计的PCB信号线进行仿真对比并进行数据测试，得出采用减少过孔直径、加宽信号线等方法，可降低PCB串口差分信号线串扰，提高SD卡信号线传输效率。该研究成果对于船岸数据通信装置信号完整性的设计提供一定参考。     

高频数据通信正交频分多路传输（OFDM）链路建立

本刊在2008年第1期刊出的《海上HF数字和电子邮件无线电技术》一文,阐述了海上HF数据和电子邮件无线电通信业务;同时介绍了调制解调(MODEM)协议使用的关键技术OFDM的ISS块格式和OFDM通信程序。《正交频分多路传输(OFDM)链路建立》是高频数据通信MODEM的另一关键技术,该技术包括呼叫程序和呼叫控制块。文章对呼叫程序和呼叫控制块进行了分析介绍,对OFDM链路的建立可能出现的两个错误进行了分析。     

海上HF数据和电子邮件无线电通信技术

在海上高频(HF)波段使用数据无线电通信技术已经成为全球航运界关注的热点。论文阐述了海上HF数据和电子邮件无线电通信业务;同时对调制解调(MODEM)协议使用的关键技术进行了分析和研究,这将有助于我国有关部门和机构跟踪和研究这一新技术,并提出应对措施。     

船岸连接系统光通讯数据调制解调设计与实现

采用软件实现方式搭建船岸连接系统光通信信号调制解调方案,并利用Modelsim模拟仿真对系统功能进行了测试,研制出了船岸连接系统光纤通信模块,实现了船岸连接系统船端与岸端的3路语音数据、1路MLM数据及1路ESD信号的可靠双向传输功能。突破了国外极少数厂家对船岸连接系统光通信技术的技术封锁。     

基于MIS的船岸通信信息系统设计与研究

在我国现阶段的船舶通信系统中,一般都采用基于海事通信卫星的船岸通信方式,这种通信方式的成本很高,而且受到海洋天气的影响。而先进的船岸通信系统已经融合了云计算和大数据技术,能够大大提高船舶的通信能力,非常便于岸基管理人员对船舶的运行状态进行综合监控,有效提高了船舶的航运安全。但是面对海量的船岸通信数据,需要强化数据库的管理能力,本文主要采用MIS技术来改善船舶通信中面临的数据处理的分类问题。从通信算法和逻辑控制层面,提升了整体的船岸通信效率。     

海上短波远程通信链路仿真预测

采用ICECAP高频传输预测软件对海上舰船与岸基多台站之间的短波远距离通信电路进行仿真分析,计算了最高可用频率、信噪比和舰载鞭状天线的场强分布,分析了天线的场强覆盖,在满足信噪比的要求及频率低于MUF的条件下,计算出场强中值大于接收机灵敏度的台站个数,形象地描述了海上短波远程通信过程。     

现代卫星技术在航运业的应用

现代卫星技术已广泛应用在船舶卫星定位、海上遇险通信、船岸和船舶间通信、船舶监控和业务管理、船员休闲通信等方面,而且卫星技术发展对航海教育产生了较大的影响,如何适应卫星技术的发展是航运界应该研究的问题。     

海上高频电子邮件技术

海上高频电子邮件技术[1]是海上高频数字通信技术的重要部分,使用PACTOR-Ⅲ协议和现有海上中/高频无线电设备,经由全球链路网( GLN)与陆上用户进行通信.海上高频数字通信技术主要包括PACTOR-Ⅲ协议和T总线协议.对海上高频数字通信的带宽和传输速率、调制、编码和码率、振幅因数与发射机输出功率、数据包的结构、控制信号、信号特征等技术问题的分析,对海上高频段新通信技术的引进有非常重要的价值.     

海上中/高频通信仿真系统设计

根据海上中/高频通信原理和通信程序,研制海上中/高频通信控件(ActiveX控件),仿真海上中/高频收发信机功能;使用UDP协议(user datagram protocol)广播电文;使用VB语言编制SAILOR中/高频组合电台控制单元模拟器、窄带直接印子电报(NBDP)终端模拟器、模拟海岸电台和模拟陆地电传用户,并采用后台支持、仿真数据库等网络仿真海上中/高频各类通信。该仿真系统可不设服务器,更能反映海上中/高频通信特性,并可方便组网训练。     

New-Level VR Marine Training System

Marine simulator is a valuable and effective medium for maritime education and training and is becoming widespread to foster the qualified and competent personnel for working in the maritime industry.However,many problems with most marine simulation systems today limit their pervasive use:the limited accessibility,immobility,the high expenditure,the long develop- meat cycle,and the difficult maintenance etc.A web-based maritime training environment is proposed in this paper as a new ma- rine training level,which fully combining web technology,VR,high fidelity simulation,and e-learning tools to create a more cost- effective and flexible training environment still with very realistic and high-interactive simulation characteristics,the system will provide a consistent and more flexible training medium for improving maritime education and training.     

海上中高频无线数字语音通信技术的探讨

文中探讨了如何在海上中高频无线信道实现数字语音通信,并阐述了应用的关键技术。     

基于嵌入式的海洋运输环境数据采集与动态监控节点设计

为保障海上船舶运输数据的有效采集和监控,需要对海上船舶运输数据环境监控系统进行设计。采用当前算法进行监控时,存在监测范围小、成本高、功耗高、实时性低等问题。为此,提出一种低功耗适用于海洋运输环境的物联网动态监控的节点设计方案。该方案先定义基于物联网的海上船舶运输环境数据监控系统模型,将此系统模型分为无线传感网络、汇聚节点和监控中心,在此基础上对传感器节点、汇聚节点以及监控中心的硬件均进行设计,并给出基于ZigBee技术的无线传感器组网过程,设计出基于物联网的海上船舶运输环境数据监控系统。实验结果表明,该方法能够对海洋环境信息进行数据采集和动态监控,具有低成本、功耗低和丢包率低等方面的优点,具有可行性。     

浅述海事调查处理的机制和理念

本文就海事管理中水上交通事故调查处理机制相关问题谈一些粗浅的看法。海事调查是一个科技含量较高,较侧重经验积累的系统工作,研究和借鉴国外发达国家的成熟经验,并结合我国实际情况,不断完善中国海事调查体制,提高海事调查水平。     

Monetary values of transport service attributes: land versus maritime ro-ro transport. An application using adaptive stated preferences

The objective of this work is that of illustrating a methodology to derive, in terms of trade-offs, the relative values of transport service attributes for logistics operators. In particular, the analysis yields insights on the preferences for time-savings, frequency and reliability of the transport service in terms of price, of a sample of freight forwarders located in the South of Italy. The data is gathered using an Adaptive Stated Preference application and the estimates are obtained through a Tobit ML estimator on both company specific data and pooled data. The results show that frequency is the most highly rated characteristic of the service together with reliability. The value of time is significantly lower in both cases. The outcome is consistent across estimations and, substantially in line with the outcome of previous studies carried out on operators active at different levels of the transport-logistic chain. Until now, in fact, studies have been carried out uniquely on carriers or producers. The selection of freight forwarders allows to shed light on a segment of the market that accounts for more than half of the transport-related decisions. Furthermore, the present study focuses on a comparison between all land transport and maritime ro-ro alternatives, in line with the growing interest on the integration among transport modes. The output signals both the absence of any a priori preclusion for ro-ro maritime services and the extremely important role that frequency of service assumes for the development and the establishment of maritime services as realistic alternatives to all land transport.     

Employability skills of maritime business graduates: industry perspectives

The maritime industry underpins international business and world trade. As to be expected, business management is critical for the maritime industry, requiring highly trained individuals and teams to lead the development, implementation and control of sound contemporary management practices. Maritime business degrees are developed by universities to meet such demand by providing graduates with sufficient skills for the onshore business-related roles. This empirical study conducted in Australia, USA and Canada, investigates current and future industry employability skills for maritime business graduates through focus groups, individual interviews and an online survey with senior managers in maritime organisations. This study found the important employability skills for maritime business graduates which include communication, problem solving, adaptability, self-management, team work, and digital literacy and technology. Demand for digital literacy and technology knowledge and skills have increased due to the maritime industry having a trend of moving towards digitalisation and automation. However, the survey findings revealed that a skills focus for maritime business graduates will not be the technology itself but the use and management of technology. In relation to future skills/knowledge required from maritime business degree graduates in 10 years’ time, communication and adaptability are recognised as being the most important. Employers expect that maritime business graduates should be able to adopt new technology and be competent in communication, and be more adaptable given the highly dynamic nature of the maritime industry. Moreover, they require graduates to be equipped with a higher level of computer skills, have a strong work ethic and multilingual skills.     

A fuzzy Delphi-AHP-TOPSIS framework to identify barriers in big data analytics adoption: case of maritime organizations

ABSTRACT

Big data analytics has prospered in recent years and has triggered revolutionary changes in various industries. However, its adoption in maritime organizations is relatively lagged and there is no study addressing this phenomenon so far. This paper develops a fuzzy Delphi-AHP-TOPSIS framework to identify barriers in emerging technology adoption. A case study employs this framework to investigate the hurdles for big data analytics to be adopted in the maritime industry. The case study shows that the framework is useful in identifying and ranking barriers. The results unveil the most serious managerial, cultural, and technical barriers that impede the adoption of big data analytics in maritime organizations.     

AIS应用在航标中存在的问题及建议

运用高新技术增进海上交通运输安全,为航海人员提供更好的航标服务是航海科技工作者的目标。将船舶自动识别系统(AIS)应用于航标有其独特的优点,有效地改善了航标的助航效果。此文在介绍AIS航标的分类、特点、局限性和对航行船舶的导航作用的基础上,提出AIS应用在航标中尚存在的问题和在使用、设置上的建议。