引入导航信息与雷达互测机制的目标指令误差估计方法

中段接力制导作战是协同作战的一种具体协同模式。提出基于平台间雷达互测机制与导航信息的目标指令参数误差估计模型。根据平台间的雷达互测机制得到的平台量测和两平台惯导设备输出的自身定位信息,在发射平台的传感器局部坐标系中表示出目标和平台的位置坐标,实现多传感器数据位置对准,并对各平台的设备偏差进行估计和补偿,消除系统误差的影响,提高了各平台的传感器测量数据精度。     

基于异类传感器的数据融合系统

运用各种有源和无源探测设备在内的异类多传感器集成提供多种观测数据,同时通过不同传感器之间的关联来提高数据精度,可以得到关于目标的更多特征信息,从而为身份识别、态势估计提供更多的依据.基于异类传感器的数据融合系统实现了雷达、ESM等异类传感器的数据关联与融合.仿真结果表明:系统能提供更高精度的数据,获得目标的更多特征信息,并可对目标实施有效识别.     

基于雷达/电视的自标校数据融合方法

针对航母起降引导系统岸基标校真值测量问题进行研究,提出一种基于着舰引导雷达/中线电视测量数据融合的目标定位算法.首先,考虑到起降引导系统相关设备测量频率不一致,且不同位置船体姿态不同、测量坐标系不统一的问题,进行时间取齐和空间转换,统一转换至理想着舰点坐标系下进行处理;接着推导各设备测量误差的传递模型;最后在新获得的误差方差基础上采用加权平均法将着舰引导雷达和中线电视的测角信息进行融合,并给出最终目标位置估计结果.仿真结果表明:该方法在着舰引导雷达和中线电视性能良好的情况下具备较高的定位精度.     

基于雷达/电视的自标校数据融合方法

针对航母起降引导系统岸基标校真值测量问题进行研究,提出一种基于着舰引导雷达/中线电视测量数据融合的目标定位算法。首先,考虑到起降引导系统相关设备测量频率不一致,且不同位置船体姿态不同、测量坐标系不统一的问题,进行时间取齐和空间转换,统一转换至理想着舰点坐标系下进行处理;接着推导各设备测量误差的传递模型;最后在新获得的误差方差基础上采用加权平均法将着舰引导雷达和中线电视的测角信息进行融合,并给出最终目标位置估计结果。仿真结果表明:该方法在着舰引导雷达和中线电视性能良好的情况下具备较高的定位精度。     

一种基于合作目标的机动雷达误差配准技术

针对机动平台传感器非协同误差配准技术实施难度大和配准效果差的问题,对基于合作目标的协同误差配准技术进行了研究。首先根据传感器对合作目标的地球直角坐标系量测方程,建立了系统误差的估计模型,然后根据建立的系统误差估计模型,利用传感器获得的量测和目标通过数据链上报的导航信息,采用最大似然估计技术,对系统误差进行估计。仿真结果表明：该系统误差估计模型可得到系统误差的有效估计,并对目标的导航误差具有强鲁棒性,因此该算法具有一定的工程应用前景。     

基于AIS的商船雷达性能分析方法

利用模糊综合评价将雷达数据和AIS数据进行融合形成两者的共同航迹,实现信息互补和位置的精确定位。首先将雷达和AIS测得不同坐标系下的位置信息变换到同一个平面坐标系中;其次统一传感器的信息,由于二者对同一目标所采集到的时间不同;然后综合考虑航行速度、航行角度和航行距离来确定航迹;最后实现信息融合,通过实验验证基于AIS的商船雷达性能分析是可行的。     

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.     

一种时间-传感器系统误差估计算法

由于时间的不一致和传感器系统误差直接影响目标探测信息的精度,假设卫星导航的精度足够高,不考虑导航误差的影响,在时间-传感器系统误差传递模型的基础上,利用对空中平台的实时观测和平台的导航信息,获取观测数据的新息相关函数序列,对未知的系统模型参数和噪声统计参数进行在线辨识,构建自适应滤波,实现对多平台时间-传感器系统误差的实时估计和配准。通过对比仿真实验表明,该算法收敛速度快,估计精度较高。     

船用雷达正逐步发展成为综合导航系统的核心设备

虽然船用雷达的首要功能是为导航时提供避免碰撞的信息,但为了顺应导航技术日趋电子化、综合化、信息化的发展潮流,船用雷达正在逐步发展成为一种传递处理、显示和储存各种雷达数据、目标数据以及外接传感器数据的信息化设备,在现代化综合导航系统中充当日益重要的角色。纵观船用雷达近半个世纪的发展史,可清晰地发现一条符合上述发展趋势的主线:     

海上自主航行设备导航技术研究

近年来,雷达技术被越来越广泛地应用在机器人技术中,尤其在海上机器人障碍规避机制的构建中,发挥了重要的作用。为了实现海上设备的自主航行,需要将雷达信号分析技术与目标探测技术相结合。本文提出一种应用于海上自主航行设备的模型,该模型能够将射程谱的最优估计转换为多目标信息,同时能够基于雷达信噪比信息,实现雷达功率谱预测。本文对该模型进行理论分析,并采用数值模拟,证明提出的模型能够实现海上障碍的有效探测,帮助海上设备实现自主航行。     

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.     

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.     

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.     

Catalyzing Coastal Management in Kenya and Zanzibar: Building Capacity and Commitment

Site-based projects were initiated in Chawka Bay-Paje, Zanzibar, and Nyali-Bamburi-Shanzu, Kenya, to demonstrate the benefits of an integrated coastal management (ICM) approach for addressing coastal issues such as tourism development and enhancement of resource-dependent village economies in eastern Africa. A two-year, multidonor project used three primary strategies to make rapid, but sustainable, progress toward ICM. These included using interagency government teams for ICM planning, adopting an internationally recognized framework for ICM as a project ''road map,'' and explicitly incorporating capacity-building strategies into all aspects of the project. Within two years, integrated ICM action strategies, prepared through participatory processes, were being implemented at both sites, and both teams were working to expand the scale and scope of ICM in their nation. More importantly, the project helped create committed, capable, interagency groups that continue to work together to address urgent ICM issues.     

A simplified method for reliability- and integrity-based design of engineering systems and its application to offshore mooring systems

This paper presents a simplified method for the reliability- and the integrity-based optimal design of engineering systems and its application to offshore mooring systems. The design of structural systems is transitioning from the conventional methods, which are based on factors of safety, to more advanced methods, which require calculation of the failure probability of the designed system for each project. Using factors of safety to account for the uncertainties in the capacity (strength) or demands can lead to systems with different reliabilities. This is because the number and arrangement of components in each system and the correlation of their responses could be different, which could affect the system reliability. The generic factors of safety that are specified at the component level do not account for such differences. Still, using factors of safety, as a measure of system safety, is preferred by many engineers because of the simplicity in their application. The aim of this paper is to provide a simplified method for design of engineering systems that directly involves the system annual failure probability as a measure of system safety, concerning system strength limit state. In this method, using results of conventional deterministic analysis, the optimality factors for an integrity-based optimal design are used instead of generic safety factors to assure the system safety. The optimality factors, which estimate the necessary change in average component capacities, are computed especially for each component and a target system annual probability of system failure using regression models that estimate the effect of short and long term extreme events on structural response. Because in practice, it is convenient to use the return period as a measure to quantify the likelihood of extreme events, the regression model in this paper is a relationship between the component demands and the annual probability density function corresponding to every return period. This method accounts for the uncertainties in the environmental loads and structural capacities, and identifies the target mean capacity of each component for maximizing its integrity and meeting the reliability requirement. In addition, because various failure modes in a structural system can lead to different consequences (including damage costs), a method is introduced to compute optimality factors for designated failure modes. By calculating the probability of system failure, this method can be used for risk-based decision-making that considers the failure costs and consequences. The proposed method can also be used on existing structures to identify the riskiest components as part of inspection and improvement planning. The proposed method is discussed and illustrated considering offshore mooring systems. However, the method is general and applicable also to other engineering systems. In the case study of this paper, the method is first used to quantify the reliability of a mooring system, then this design is revised to meet the DNV recommended annual probability of failure and for maximizing system integrity as well as for a designated failure mode in which the anchor chains are the first components to fail in the system.     

含裂纹钢板复合材料修补强度和刚度数值分析

用ANSYS有限元分析软件对复合材料补片修复含边裂纹和中心裂纹钢板的强度和刚度进行了数值分析.引入相对刚度的概念,研究了钻有止裂孔裂纹的长度对损伤钢板相对刚度的影响,分析了损伤钢板刚度复合材料贴片修补效果;引入屈服载荷提高率的概念,分析了损伤钢板强度的修复效果.     

混凝土道路、堆场面层裂缝的产生与防治

从混凝土道路、堆场的各个结构层分析裂缝产生的原因,并针对性地说明预防措施,阐述裂缝维修方法。     

舰艇反鱼雷技术

对目前舰艇反鱼雷技术中的非杀伤、软杀伤和硬杀伤等比较先进的手段进行了阐述,并在此基础上分析研究了舰艇反鱼雷技术的发展趋势。     

利比亚米苏拉塔市萨瓦瓦区5000套住宅项目中心区设计

从确定符合项目实际情况的设计原则入手,通过利比亚米苏拉塔市萨瓦瓦住宅区中心区总体布局和建筑设计两个方面的设计实践,探讨了"传统、现代与文脉"这一当今时代无法回避的文化议题。并且针对具有鲜明文化、宗教和气候特征的建筑设计的特点、方法与风格进行了总结,为今后的实践提供借鉴。     

Community-Based Management for Sustainable Fisheries Resources in Phang-nga Bay,Thailand

Fishing communities, the Government of Thailand Department of Fisheries, local nongovermnental organizations, universities, the Food and Agriculture Organization of the United Nations (FAO), and FAO's Bay of Bengal Program have undertaken a partnership in management of Phang-nga Bay's coastal resources. It is the first project of its kind in Thailand, and although still in the early stages, offers insights that may contribute to our knowledge of how we can improve our management of coastal resources, including the importance of (1) building relationships within the governance process; (2) combining education, enforcement, and economic incentives to achieve compliance; (3) implementing solutions early; and (4) government support of community-based decisions. These insights reinforce trends emerging in other coastal management projects in the Asian region.