低温运载火箭“零窗口”发射研究

针对"嫦娥""北斗"组网工程系列卫星提出的"零窗口"发射要求,结合低温运载火箭特点及发射场系统现状,对低温火箭"零窗口"发射技术进行了研究。从低温火箭测发系统现有的技术手段、任务组织及保障模式出发,查找系统存在的薄弱环节,从技术改进、设备可靠性增长及组织指挥方法创新等方面,制定适应低温运载火箭"零窗口"发射要求的相关技术手段和策略。     

事件

中国北斗卫星导航系统基本建成 中国北斗卫星导航系统自2011年12月27日起向中国及周边地区提供连续无源定位、导航、授时等试运行服务。目前,北斗卫星导航系统已经发射了10颗卫星,建成了基本系统。据介绍,北斗卫星导航系统正按照“三步走”的发展战略稳步推进。第一步,2000年建成北斗卫星导航试验系统,使中国成为世界上第3个拥有自主卫星导航系统的国家。第二步,建设北斗卫星导航系统,2012年左右形成覆盖亚太大部分地区的服务能力。第三步,2020年左右,北斗卫星导航系统将形成全球覆盖能力。     

光谷北斗:树自主品牌 用产业报国

<正>武汉光谷北斗控股集团有限公司(以下简称"光谷北斗")因北斗国际化而诞生,坚持"先国外、后国内,以外促内、内外并举"发展路径,在国内外开展了一系列卓有成效的北斗合作,成为践行北斗国际化及"一带一路"国家战略的领先者与排头兵。北斗卫星导航系统的首个海外用户是泰国。自2011年起,光谷北斗与泰国科技部地理空间技术局(GISTDA)开展了在卫星应用科技研发、共同防范和应对灾害及空间信     

北斗“专列”——长三甲系列运载火箭

正2020年6月23日9时43分,在中国西昌卫星发射中心,长征三号乙运载火箭托举着北斗三号最后一颗全球组网卫星直破云霄。北斗卫星导航系统第55颗卫星已准确进入预定轨道,此次发射任务取得圆满成功!被誉为北斗"专列"的长三甲从2007年发射首颗北斗卫星起,13年间,"金牌火箭"长三甲系列运载火箭将所有北斗卫星送入预定轨道,发射成功率100%。可以说长三甲系列火箭伴随了北斗系统建设发展的每一步,是名副其实的北     

GPS抗干扰技术发展趋势

随着信息技术的深入发展,研究复杂电磁环境下的GPS干扰和抗干扰,对打赢未来信息化条件下的局部战争,具有十分重要的意义。从GPS工作的基本原理出发,在卫星、地面监控系统、接收系统等方面分析了对GPS的干扰措施,阐明了GPS抗干扰技术的现状,指出了几个未来重点发展方向,并提出了提高北斗导航系统导航保障能力的建议。     

北斗三号系统全球短报文服务应用于宇宙探测

正1月20日,北斗三号全球卫星导航系统"准实时"将GECAM卫星探测到的伽马射线暴观测警报下传至其科学运行中心,揭开了北斗三号系统全球短报文服务应用于空间科学与宇宙探测的序幕。我国北斗卫星导航工程使用的北斗导航卫星主要由中国航天科技集团有限公司研制。引力波暴高能电磁对应体全天监测器("怀柔一号"极目望远镜,简称GECAM),是北斗三号系统全球短报文服务的首个卫星试验用户,也是我国首个具有即时下行观测数据能力的空间天文望远镜。该卫星创新性地使用北斗三号系统的全球短报文通讯链路,将天体爆发的关键科学数据准实时下传至地面,从而快速引导其他设备的后随观测。试验中,卫星将信息通过北斗三号系统下传至地面,GECAM卫星科学运行中心在触发后约60秒收到第一条北斗短报文,其后10分钟内收到所有短报文信息。短报文传输功能正常,性能指标均符合设计。     

“北斗”卫星导航系统的概述与应用

"北斗"卫星导航系统是我国自主研发、独立运行的卫星导航系统,对于国防和经济建设有着非常重要的作用,自2012年12月27日正式提供导航服务以来,在国防和经济建设中发挥着重要的作用。本文就"北斗"的组成、功能、特点、应用及发展前景进行简述,旨在让读者了解"北斗"卫星导航系统基本知识。     

中国北斗卫星导航系统

北斗卫星导航系统是中国自行研制的全球卫星定位与通信系统(BDS),是继美全球定位系统(GPS)和俄格洛纳斯(GLONASS)之后第三个成熟的卫星导航系统。此后,欧洲"伽利略"问世。北斗系统可在全球范围内全     

“北斗”有望成我国主要导航方式

"北斗"多模导航终端市场规模2015年预计达到400亿元,2020年将达到4000亿元,有望取代美国的全球定位导航系统(GPS)单模,成为我国主要的导航方式2012年10月25日,中国第16颗北斗二代导航卫星被送入预定轨道;12月27日,北斗系统空间信号接口控制文件(ICD)正式版公布,标志着北斗导航系统正式向亚太区域提供持续无源定位、导航、授时等服务。如果说"北斗一代"的试验系统让中国成为世界上第三个拥有自主卫星导航     

航天科工二院203所获得北斗卫星导航产品质量检测中心资质

<正>在近日召开的第二届北斗民用推进会上,中国卫星导航定位应用管理中心正式授予航天科工二院203所"北斗卫星导航产品2101质量检测中心"资质。北斗系统是我国军民共用的重要空间基础设施,是我军信息化建设的重要基础平台,广泛应用于国防建设和经济社会各个领域,已为十余万军民用户提供了全天候、不间断的高精度定位、     

Helping hands: civil–military cooperation and Italy's military operation abroad

In the Post-Bipolar Era the growing complexity of the military operations requires a new approach for the resolution of international crises. Since the end of the Cold War, peace support operations (PSO) have become the mainstay and principal occupation of most Western armies. At the same time, Italy has been one of the most important actors in such an area. The article focuses on the cooperation between military and civil components (a process called CIMIC) as a key variable in the Italian PSOs. We will analyse in detail the main lessons learned from past military interventions as well as the general context in which new tendencies are taking place. The maintaining of a minimum security frame becomes essential to fulfil activities ‘collateral’ to the mission: reconstructing services and infrastructure, food distribution, water and medication, law and order, de-mining, training of local forces, and supporting local institutions. These are the main tasks to obtain thrust and support from the population.     

Terrorism,insurgency, kidnapping,and security in Africa's energy sector

Energy continues to serve as the bedrock of modern economies and the main driver of modern society. For Africa, the production and supply of energy resources such as crude oil, natural gas, uranium, coal, biomass, biofuels and other renewables are an important source of employment, rents, taxes, royalties and profits. This sector brings in several tens of billions of dollars of revenue annually. The production and delivery of such resources, however, depend on critical infrastructures such as pipelines, refineries, processing plants, terminals, rigs, electrical energy pylons, substations, pump stations, vessels, and tankers. These infrastructures have been attacked by terrorists, insurgents, vandals and saboteurs, all of whom see them as targets against which to register their grievances and extract concessions from the state. This paper is a chronological account of some of the documented incidents of terrorism, insurgency, kidnapping, destruction, sabotage, and human casualties suffered in the oil and gas sectors in Africa between 1999 and 2012. It is based on data extracted from the databases of the RAND Database of World Terrorism Incidents and the University of Maryland's Global Terrorism Database (GTD).     

Tacit support for terrorism: The rapprochement between the USSR and Palestinian guerrilla organizations following the 1967 war

This article demonstrates the inconsistent and wavering Soviet attitude towards national liberation movements in general and the Palestinian organizations in particular. Until the late 1960s, the Soviets viewed these organizations with suspicion, hesitating to engage in political dialogue with them. However, in the 1970s, political and military events in the region, as well as modifications in the Kremlin's Cold War strategies, led to a general shift towards the Middle East in Soviet foreign policy. Soviet leaders showed increased willingness to provide certain Palestinian organizations with arms with which to conduct terrorist activities against Israeli, pro-Israeli, Jewish and Western targets. The article explores the complex relations between Palestinian organizations and the USSR in the field of international terror. The study also exposes and analyzes the nature and content of Soviet–Palestinian arms dialogues and transactions. It provides clear evidence that Soviet policymakers and other luminaries were fully informed of, and sometimes directly involved in, these transactions and dialogues at the highest levels.     

A1 Qaeda and the radical Islamic challenge to western strategy

The September 11 global crisis prompted by the attacks on the World Trade Center and the Pentagon raises major questions concerning the nature and trajectory of terrorism in the post-Cold War global order. Hitherto, terrorism has been largely debated by analysts at the level of nation states. Terrorist and insurgent movements have also been largely anchored in nationalist and ethnic power bases even when they have sought to mobilise a transnational ideological appeal on religious or class grounds. There have been a few exceptions to this pattern such as the alliance between the German Baader-Meinhof group and the Japanese Red Army Faction, but even such international alliances as this did not, until at least the 1980s, presage anything like a global terrorist network necessitating a global strategic response. This study examines terrorism and global strategic responses.     

Helping hands: external support for the KNU insurgency in Burma

This article analyses to what extent the Burmese KNU insurgency made use of external support from states, refugees, and diasporas. Based on extensive fieldwork it is concluded that support from neighbouring states and refugees has for years kept the Karen rebellion alive. Western countries perceived forms of resistance to the illegitimate Burmese regime as just and have therefore played a crucial role in the continuation of conflict in Karen State. It is important that policymakers and donors as well as executing organizations continue to reflect critically on the way they exercise their work.     

Reviews

Douglas S. Derrer, We Are All the Target: A Handbook of Terrorism Avoidance and Hostage Survival. Annapolis, MD: US Naval Institute Press, 1992. Pp. x+135, notes, index. $14.95. ISBN 01–55750–150–5

Ian Knight, Zulu: Isandlwana and Rorke's Drift, 22–23 January 1879. London: Windrow & Greene, 1992. Pp.136, 150 illus., incl 8 colour plates, maps, biblio. £35. ISBN 1–872004–23–7

Ian Knight, By the Orders of the Great White Queen: Campaigning in Zululand through the Eyes of the British Soldiers, 1879. London: Greenhill Books and Novato: Presidio Press, 1992. Pp. 272, 17 illus., 1 map. £18.95. ISBN 1–85367–122–3

Manfried Rauchensteiner and Erwin A. Schmidl (eds.), Formen des Krieges: vom Mittelalter zum ‘Low‐intensity’ Conflict’. Graz : Verlag Styria, 1991. Pp.208. DM35. ISBN 3–22–12139–7

Harold J. Kearsley, Maritime Power and the Twenty‐First Century. Dartmouth: Dartmouth Publishing Company, Limited, 1992. Pp.xv + 203, 13 diagrams, index. £32.50. ISBN 1–85521–288–9     

基于GTST-DMLD-ESD的装备RMS建模仿真

装备的RMS是装备的重要设计参数,是影响战备完好和保障能力的关键因素.引入GTST-DMLD作为主要建模工具,建立起装备系统的RMS描述模型,以ESD为补充和扩展,对维修过程进行建模.并以GTST-DMLD-ESD模型作为装备RMS仿真的核心,对装备RMS仿真模型的总体框架进行了研究,并对各模块进行了较为详细的探讨.     

Cyber sheiks and grassroots jihadis: the war in Syria and the devolution of the Bosnian Salafi communities

ABSTRACT

What was the scope of the Bosnian jihadi participation in the war in Syria? Did the Bosnian volunteers tend to join one particular faction? Why did the Bosnian youngsters decide to join the holy war in the Levant? Was this an organized and hierarchical process or was this a grassroots movement? Last, were all the Salafis in Bosnia supportive of this dynamic or did this process cause internal frictions? These are some of the questions that this research will try to answer.