天基数据链抗干扰问题研究

针对天基数据链的应用需求,对天基数据链的抗干扰特性进行了研究,分析了增强天基数据链系统抗干扰能力涉及的主要技术手段,提出了用户终端在设备研制中应采取的措施,并在应用方式上提出了一些建议,对于抗干扰天基数据链系统及设备的研制具有一定的参考价值。     

基于天基信息传输与分发系统的效能评估指标体系分析

效能评估是天基信息传输与分发系统设计、分析以及提高系统整体能力的基础性工作,指标体系又是效能评估的基础,必须建立科学的指标体系,使得效能评估更加合理.对天基信息传输与分发系统构成及功能进行了分析,提出了对天基信息传输与分发系统评估指标体系的构建过程,构建了天基信息传输与分发系统评估指标体系,为下一步进行天基信息传输与分发系统效能评估打下基础.     

美军舰载机着舰数据链的发展与启示

回顾了美国着舰引导系统及着舰数据链发展历程,分析了各着舰引导系统对信息传输需求的差异,总结了各着舰数据链的功能性能特征,描述了美国着舰数据链的发展趋势,探讨了新型着舰数据链的技术体制,最后指出了对我国着舰数据链技术及应用发展的启示。     

《电讯技术》专题资料

《数据链技术的发展与应用研究》题要(一)　　数据链网络规划与管理系统研究本文介绍了国外战术数据链网络规划与网络管理系统的现状与发展趋势。介绍了国外战术数据链网络规划和网络管理流程,以及主要性能和特点。数据链在陆军航空兵中的应用研究本文针对数据链在陆军航空兵中的应用,重点研究了陆航数据链所传输的战术信息内容;陆航各作战平台之间的信息交联关系;陆航数据链的基本使用要求、对传输能力的要求。分析了适合陆航的几条战术数据链,提出了陆航数据链建设的初步设想。北约最新型的数据链———Link 2 2本文详细论述了Link2 2的…     

大跨度天基数据链的TDD时隙调度分析与优化

针对天基数据链系统卫星间的传播时延较大且节点间距离变化较大等特点，提出了一种提高时频资源利用率、提升系统容量、减小时延的方法。在时分多址与空分多址相结合的接入方式下，进行了时隙调度的分析与优化，利用卫星星座的空间复用与大跨度传播时延特性，采用时隙编排、收发状态调整、帧格式优化等手段，将信道利用率和系统容量提升了1倍，将卫星节点在某一方向获得服务的平均等待时间缩短为原来的1/4，提高了天基数据链系统的服务质量。     

跟踪与数据中继卫星系统在测量船上的应用前景

介绍了国际跟踪与数据中继卫星系统（TDRSS）的基本状况与发展趋势,分析了今后测量船 利用中 继卫星系统传输高速数据的应用前景,比较了测量船加装中继卫星系统的几种方案,并 对其可行性进行了评估。     

天基信息网络的软件定义网络应用探析

现有各种空间、地面网络节点的互连互通,在一定程度上可满足特定应用需求,但由于各节点在空间、物理以及功能的局限,限制了天基信息高效传输、融合以及按需地应用。分析了天基信息网络的发展趋势,提出了网络架构构想,并对主要关键技术的研究方向进行了梳理。在空间核心节点上采用软件定义的多功能载荷平台,并基于软件定义网络（SDN）架构和空间容中断网络协议构建天基信息网络。通过资源虚拟化、处理多元化、应用无阻化的方式,保障天基信息网络适应信息按需定制和高效共享等应用需求。     

基于天基信息的反导作战效能分析

应用系统效能分析(system effectiveness analysis,SEA)方法,研究天基信息支持反导武器系统的反导作战效能分析问题.根据天基信息支持武器系统的反导作战流程和系统间的相互作用关系,设计了天基信息支持反导作战效能分析的性能度量、使命度量和效能度量算法.算法有效地把武器系统的性能和使命与环境有机结合,能够实现天基信息对武器系统反导作战支持作用效果的综合整体分析和关键指标参数的灵敏度分析.最后的数值仿真实例进一步说明了所取得的主要结果.     

国外天基预警雷达系统发展现状及关键技术

天基预警雷达作为重要的信息获取手段,其采用多种工作模式,可探测空间、空中和地面目 标。鉴于天基预警雷达系统的战略地位,美国、俄罗斯和加拿大等国竞相开发该系统。总结 了天基预警雷达系统的国外发展现状及关键技术,简要介绍了天基预警雷达的未来 发展趋势,指出美国虽怀疑其“天基雷达计划”的可行性,但仍非常重视天基雷达各项关键 技术的研究。     

天地一体化信息网络中天基卫星网络架构设计

为了充分利用各种空间设施资源，提升天基信息网络覆盖与传输能力，分别从天基信息网络体系架构和逻辑功能架构角度进行了系统性设计。与以往天基网络的设计不同，该设计更注重各类卫星网络的深度融合应用，为此将网络虚拟化技术引入天基卫星网络。同时，还提出了解决新架构下卫星组网难题的方法，将电磁涡旋、卫星灵活载荷和边缘计算技术设计到天基网络。仿真表明，所提出的架构能有效提升频谱利用率和减少卫星网络信令开销。     

Public Financial Expenditure——A Reflection of the Livelihood Improvement

In recent years.China's public finance put social construction high on the agenda and attaches more importance on livelihood insurance and improvement.The 2003-2007 public financial expenditure reflects a fact that the government isputting more emphasis on livelihood andissues concerning the people.     

Voices from the MPC and CPPCC

"Crucial for economic growth.energy utilization has its role in all economic sectors and every aspect of people's daily life.Now we are in dire need of a new profession,namely energy manager.We not only need to have passion and responsibility,but also a scientific approach to conserve energy and cut emissions.APpropriate legislation should be in place.and a special profession should be introduced to ensure the implementation of these laws and regulations."     

Slowdown Trade Surplus Growth

According to Ma Kai＇s economic planning report submitted to the NPC session on March 5th,（Ma Kai is the Minister in charge of the National Development and Reform Commission）,the government has listed the slowdown in trade surplus growth and the steady expansion of external investment as major tasks for 2008.     

Ouyang Riping： A Hero Besides Entrepreneur

A bout fifty years ago. a baby＇s cry broke the sky of quietness, in a small and beautiful town of Hunan province, which surroundcd by green hills and clear water. Though his .birth brought his family great happiness and hope just as any new life, nobody knew that the little boy would get great achievement when he grow up. even start his business oversea, and earn international honor. Let＇s share with you the entrepreneur Ouyang Riping＇s story, which may insights thcsc people who want to succeed and complete oneself in favorite condition or adversity rather leave things to so-called fate.     

Belarus, A Chinese Fort in Europe

＂In recent years, we＇ve found increasing interest from Chinese investors in the Belarus economy. Please let China know, Belarus is always ready to be a true friend to China. We have built a fort in Europe for China,＂ the President of Belarus, Alexander Lukashenko told Zhou Xiaochuan, President of the Bank of China, during his visit to the capital of Minsk, on January 8th, he expressed his high praise and firm confidence in the development of Sino-Belarusian relations.     

What＇s Behind Spring Festival？

Similar to what the Christmas Day means for the westerners,the Spring Festival is the most important celebration for Chinese people.This big event according to Chinese traditional lunar calendar relaxes and pleases the whole country as the happiest gathering time of the year.National-wide crusade for going back home,too-difficult-to-get train tickets,generous family-going-out shopping,Miaohui laundering,New Year Eve reunion dinner,visiting friends and relatives,watching annual TV gala......each piece of clue reminds us of the smell of Chinese Spring Festival.     

KEY WDRDS for Foreign Investment in China

FDI(Foreign Direct Investment),a component of a country's national financlal accounts,is investment of foreign assets into domestic structures,equipment,and organizations.It does not include foreign investment into the stock markets,concession and subcontract.FDI iS thought to be more useful to a country than investments in the equity of its companies because equity investments are potentially "hot money"which can leave at the first sign of trouble,whereas FDI is durable and generally useful whether things go well or badly.     

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.     

Consumption, New Protagonist in 2007 GDP

Not long ago, the National Bureau of Statistics released its 2007 Macro Economy Index. Social consumption retail sales reached RMB 8.9 billion, increased by 16.8 percent over the previous year, or 3.1 percentage points higher; the whole investment in social fixed assets was valued RMB 13.7 billion, a year-on-year increase of 24.8 percent, that is 0.9 percentage points higher; and trade surplus amounted to RMB 24.7 billion, rising by 47.7 percent compared with the same period last year, 26.3 percentage points falling over the increasing speed last year. According to preliminary estimates, GDP for the year was RMB 24.67 trillion, up by 11.4 percent from the previous year,