空中异构战术网络IP通信架构及协议开销分析

空中异构战术无线网络由多种不同类型的无线数据链网络构成,IP通信技术可有效解决空中平台异构无线网络的互联互通问题。给出了空中异构战术无线网络模型,并根据不同类型的无线数据链网络特点,分析了端到端通信协议栈关系以及不同无线数据链网络间协议转换与适配方式。探讨了网络静态和动态IP地址分配方法以及网络的路由架构与寻址方式,提出了不同无线数据链网络间IP报文传输的打包方式。对传输的开销性能仿真对比分析表明,基于通用成帧协议的打包方式的协议开销性能较优。     

基于两步分布协同拍卖的多机协同任务分配

针对多异构机载平台对不同类型的地面目标执行攻击任务的协同任务分配问题,以平台载弹量以及摧毁任务目标的需弹量建立平台与任务之间的关系,以各平台的任务序列以及执行任务时的武器使用量序列作为决策变量,在基地-任务航路矩阵和任务-任务航路矩阵的基础上,综合考虑平台武器约束、平台航程约束、任务需弹量等约束,建立多机协同任务分配模型。设计了两步分布协同拍卖算法,通过多次生成任务的拍卖招标顺序和基地的拍卖竞标顺序,实现了多机协同任务分配问题的优化求解。仿真结果表明,所建模型和求解算法能够有效合理地解决多机协同对地攻击的任务分配问题。     

基于差分GPS的战术数据链高精度时间同步

精确协同作战作为信息化条件下作战形态的必然发展趋势,其对作战平台间高精度时间同步提出了较高的要求。针对该要求,在分析了战术数据链往返计时（RTT）时间同步算法的基础上,提出了卫星导航载波相位差分GPS（DGPS）技术与数据链高精度时间同步算法,利用卡尔曼滤波构建时间同步计算算法模型,实现高精度的时间同步。仿真结果表明该算法可提高时间同步精度到3 ns。     

基于飞行轨迹的无人机通信信道仿真

通过分析无人机之间无线链路的传播损耗、多普勒频率和多径时延等特征参数,提出 一种基于三射线的无人机通信信道模型,并给出了无人机飞行轨迹在不同坐标系中的转换公 式及已知飞行轨迹求解信道模型参数的方法。最后针对两种不同的典型飞行场景,对无人机 通信链路的多径时延、传输损耗及多普勒频率算法进行了仿真验证,并获得了基于飞行轨迹 的无人机空空数据链信道模型。该模型对无人机数据链系统参数选取、物理层算法设计和性 能分析等具有重要意义。     

一种数据链集成架构

目前数据链集成需要统一的解决方案。通过对美军数据链集成发展现状的分析,给出了一种基于统一的软/硬件接口标准,通过构建通用信息处理服务、通用多数据链平台接口和通用数据链端机接口来实现的一种集成框架,并给出了典型平台集成应用,提出了实现该架构的关键技术,可以有效解决数据链平台集成和多链集成应用问题。     

数据链消息处理技术

分析了数据链消息处理系统在不同阶段的发展情况和可扩展标记语言(XML)的技术特点,针对数据链消息处理系统实现与消息格式绑定过紧的问题,提出了采用XML技术进行数据链消息处理系统设计的思路,最后举例说明了该思路在数据链消息处理系统中的具体实现.该方法可提高数据链消息处理系统的可扩展性,对于开发新的数据链消息处理系统具有很强的借鉴作用.     

一种新型IP数据链网络路由算法模型

针对无线数据链网络,提出了一种新型的基于分层结构 的IP路由算法模型,满足至少3种异构数据链网络的集成要求。仿真结果表明,该模型可有 效支撑基于链路带宽、传输时延、链路质量等多种QoS的路由算法设计,为无线数据链网络 层IP路由协议和算法设计提供了理论框架和实现指导。     

影响机间数据链组网协议设计的主要因素分析

指出了机间数据链组网协议的设计目标,对机间数据链网络常用拓扑结构及适用的 多址接入方式进行了阐述,对影响机间数据链组网协议设计的主要因素进行了详细分析, 给出了机间数据链组网协议的设计思路和流程,并对今后机间数据链组网协议的发展进行展 望。     

VHF/UHF空地数据链系统越区切换设计

在研究空地数据链系统的基础上,设计了一个简单适用的越区切换算法,并对算法进行仿真,证明该算法可保证系统连续有效地工作。     

基于QualNet的战术数据链多链建模与仿真

战术数据链(TDL)的基本作用是保证战场上各个作战单元之间迅速交换情报信息,提高相互协调能力和整体作战效能.为了研究在实际应用中战术数据链系统多链工作情况下的实时性,基于QualNet仿真软件,设计并实现了一种战术数据链的多链模型,同时结合两种波形的试验对战术数据链多链间分组传输时延进行仿真,给出了仿真结果并进行了分析.     

Brown＇s Blossom in Britain-China

The overall strategic relationship between U.K. and China is ＂better than ever＂, China- Britain relations have maintained good momentum, with increased high-level exchanges and the reinforcement of strategic mutual trust, with more room for growth in the future.     

Challenge and Opportunity Go Hand in Hand——What Global Economic Agitation Brings to the China's Economy?

Domino effects of the global finance agitation As the origin of the subprime crisis,US financial institutions lost USS45 billion last year,accounted for over half of the total US,EU & Japan loss.Since January 15th,Chtigroup released its financial statement of the 4th quarter,showing a net deficit of USS9.83 billion,which marked the hisoric high of its quarterly deficit.     

Sinosteel：Extraordinary Moves in Industry Chess

Among the Fortune 500 firms,more and more images from China emerge out.On the 2008 list,Sinosteel Corporation,a landmark group of China industries quietly squeezes into the candidate line.As the largest steel service ＆ trade enterprise,its sales reached at RMB 111.24 billion,with a year-on-year increase of 83.03 percent,and the profit grew by 180.03 percent.On the Sinosteel 2008 Work Meeting,the president Huang Tianwen uttered,＂In the coming year,we will work for US$20 billion sales,and look forward to getting a position in Fortune 500 firms for ourselves.＂     

Walk Through Unusual Five Years—— An Exhibitor＇s Canton Fair Course

When the 103rd Canton Fair is approaching, an old friend of Canton Fair, Li Ying from Jiangsu prov-ince recollected his past five years＇ experiences to the grand trade meeting. Each year is special, with some unforgettable memories colored by the year.     

Jean-Pierre Duprieu： Willing to Be A Legate of Sino-French Business

Estaing, former French president, Valery Giscard d＇Estaing attended Sino-French Economic Seminar held in Shanghai in early April and said that the world center has shifted from the west to the east with many European and US companies entering into Asia, and China has the ability to play an important role in the world stage. Estaing, naming himself＂French Confucian＂, then said in Chinese that a cook-group includes 10 people in ancient Chinese soldier system and the cook is in charge of cooking for them. And people who belong to the same cook are actually ＂Partners＂.     

China''''s Stock Market Wave

The annual meeting of the World Economy Forum was held in Davos,a little town in Switzerland,on January 23rd to the 27th this year,with the theme"the Power fo Collaborative Innovation",over 2500 celebrates from ture political and cconomic circles of more than 80 countries and challengred logether to talk about the future of the global economy in 2008,A Forum for the problems and challenges that face whole world,some of the keywords which drew attention during the event were:the U.S.subprime mortgage crisis,soaring energy prices,the economic slowdown in the U.S.ermerging economic bodies,authority funds and the general unpredictable nature of the global economy.     

Trade Promotion from Neighborhood

If you are considering to trade with companies in Japan or expanding your .business to Japan, we are ready to help from the very beginning.＂ You will find this greeting at the first sight on the Chinese website of Japan External Trade Organization （JETRO）. JETRO has committed itself in delivering highly efficient and quality services to meet the demand of internal and external customs including Japanese companies, hence winning a good reputation in the international trade arena. In recent years, with its priority in advancing business cooperation in South and East Asia, JETRO has made great achievement in promoting trade between China and Japan. Therefore, China＇s Foreign Trade interviewed Mr. Yoichi Maine, Deputy Director General of JETRO BEIJING.     

Auto Parts Market Potential Coming into Surface

Looking at the increasingly fierce competition in the world auto market. global automobile manufacturing industry, taking Europe, the U.S. and Japan as representatives, is gradually forming a new type of relationship, mutual cooperation between whole vehicle and parts manufacturers. We can clearly see that auto parts manufacturers have become independent from the whole vehicle manufacturing companies, which means that the former structure of auto industry has greatly changed, and a new relationship,     

Domino Effect on Electricity and Coal Prices

In the middle of last December, the key purchase contracts for coal used in power generation in 2008 were signed, reflecting a demand for more than 1.085 billion tons. It is important to note that the country＇s five biggest power producers, China Huaneng Group, China Guodian Corporation, China Power Investment Corporation, China Huadian Corporation and China Datang Corporation, had settled on the prices on their purchase contracts, and they are expected to consume 290 million tons of coal for generating electricity,     

Slimmed May Day Holiday

Last November the State Council of China decided to renew its holiday system by reducing the seven-day May Day holiday to three days and introducing three new one-day public holidays, namely the Qingming Festival, Dragon Boat Festival and Moon Festival. By doing so, the three golden-week holidays that were introduced in 1999, namely the Spring Festival, May Day and National Day, could be better distributed.