基于软件无线电的气象传真接收系统优化设计

为有效解决模拟解调气象传真接收机的精度和灵敏度低、抗干扰能力差等问题,提出基于软件无线电的气象传真接收系统优化方案。该系统采用J型场效应管、ESD保护电路和滤波电路等构建水准匹配的电小有源天线;采用超外差接收机技术、电调谐滤波器技术、数字解调技术、FFT同步算法、Rife频偏估计算法及基于DSTFT的FSK算法构建气象传真接收机信息接收和处理单元,实现气象传真信号的接收、数字解调、处理和显示。试验结果表明:该系统能完成气象传真信号的解调和气象传真图的恢复,图像质量和视觉效果均得到很大改善。     

改进的BP神经网络方法在舰船修理费用预测中的应用

文章基于神经网络理论,以某型舰船特装修理费用为例,建立了改进算法的BP神经网络预测模型,最后对海军舰船特装修理费用进行了中短期预测。     

基于二型模糊数据挖掘的船用气象数据网络应用

海上气象灾害是影响船舶航行最危险的环境因素,如何通过船用气象传感网络采集的数据进行气象灾害预测及决策是现代海上决策系统研究的重点。随着计算科学的发展,数据挖掘在大数据处理中得到广泛应用,根据船用气象数据的噪声及边界模糊特性,本文选择基于二型模糊数据挖掘的船用气象数据决策模型,对气象数据采用密度因子进行分布调节,同时将多维气象数据进行降维处理,设计高效的海上气象灾害决策系统,最后进行实验。     

美国海军基于战术雷达的灾害性天气探测及显示系统

介绍美国海军舰艇基于战术雷达的灾害天气探测及显示系统。该系统通过附加的气象雷达数据处理器和基于网页的服务器,提供舰载SPS-48E等雷达的实时监测数据和图像。系统由气象数据接口转换卡及气象数据提取计算机构成。经过验证,该系统与专用气象雷达性能相当。     

气象因素对炮兵雷达探测距离的影响研究

为了准确掌握气象因素对某新型炮兵雷达探测距离的影响规律,提高雷达的作战效能。分别建立了大气、雨、雾影响下雷达探测距离的修正模型,依据此模型设计了可视化界面平台,可以得到不同气象条件下的雷达波衰减系数和预测雷达的最大作用距离,为在不同气象环境中使用此雷达提供了基本数据依据。     

导弹轨上运动参数测量系统设计与应用

为了在导弹发射的强烈冲击振动和高温环境下得出导弹在发射导轨上的运动规律,介绍了采用光电探测、数字存储测试（黑匣子）技术结合基于VC平台下的数据处理方法来获取导弹在发射筒中运动的时间、位移、速度和加速度等数据,实现了导弹发射试验中轨上运动参数的精确测量,保证了导弹内弹道分析的试验数据需要。     

集对分析在多雷达数据融合中的应用研究

多部雷达在探测目标时,因受低空杂波、电子干扰和雷达自身探测精度等影响,易使部分雷达的探测数据不可靠而造成融合中心数据处理精度的下降.针对这一问题,本文提出了一种应用1次融合数据为特征的集对分析思想,把每时送入融合中心的各雷达探测数据与1次融合后的数据组成集对,求出目标状态当前时刻的区间估计,去掉每时落入估计区间之外的雷达探测数据,再作2次融合.仿真结果表明,应用集对分析实现多雷达探测数据的择优融合,不仅算法简单,而且能有效提高不确定雷达系统的跟踪精度和可靠性.     

集对分析在多雷达数据融合中的应用研究

多部雷达在探测目标时，因受低空杂波、电子干扰和雷达自身探测精度等影响，易使部分雷达的探测数据不可靠而造成融合中心数据处理精度的下降。针对这一问题，本文提出了一种应用1次融合数据为特征的集对分析思想，把每时送入融合中心的各雷达探测数据与1次融合后的数据组成集对，求出目标状态当前时刻的区间估计，去掉每时落入估计区间之外的雷达探测数据，再作2次融合。仿真结果表明，应用集对分析实现多雷达探测数据的择优融合，不仅算法简单，而且能有效提高不确定雷达系统的跟踪精度和可靠性。     

一种基于交替投影的脏数据处理方法

由于硬件、软件或传输故障等,用于流量矩阵估计的简单网络管理协议(Simple Network Mamagement Protocol, SNMP)数据可能包含脏数据,从而影响流量矩阵的精度.针对这个问题,提出一种基于SNMP的脏数据处理模型,摆脱了原有SNMP脏数据处理需要源-目的节点对间流量大规模测量的限制.基于交替投影方法,对此模型提出求得L0范数最小的稀疏脏数据处理方法.该算法降低了网络测量开销和时间复杂度,易于实现.实验表明,该算法对脏数据校正也有较高精度.     

探测位置数据处理技术的现状、发展和对策

作战指挥系统的重要任务之一就是对获得的或／和探测到的目标空间位置数据进行处理(称为位置探测数据处理，滤波和数据融合等都属于这方面的技术)。由于位置探测数据处理是由计算机完成的。所以位置探测数据处理方法的选择都不可避免地受到当时计算机运算速度等技术的限制。随着计算机技术的发展。计算机对位置探测数据处理计算量的限制正在大幅度地减弱。那么那些在“老的”计算机限制下选用的位置探测数据处理方法是否还适应现在需求，是否有必要在“新的”计算机平台上重新研究和选用新的位置探测数据处理方法以适应未来军事的需求。新的位置探测数据处理方法可能改进领域和相关的解决方法，以及位置探测数据处理发展方向和趋势是本文研讨的主要内容。     

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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第34届海洋、离岸及极地工程国际会议(英文)

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;     

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.