基于S参数法的车载天线耦合度分析

为研究车载天线系统电磁兼容性,在ANSA软件中建立全尺寸装甲车辆电磁仿真简化模型。基于广义S参数理论,给出收发天线间的电磁耦合度表达式。利用CST仿真分析了理想导体平面上收发天线对、装甲车辆车载收发天线间两种电磁耦合度。结果表明,天线间距减小,车载天线间的耦合度非线性变化,但基本呈增加趋势。收发天线工作于谐振频率62.5 MHz时,电磁耦合度最小,谐振频率附近出现两个电磁耦合度最大峰值。发射天线的3次谐波与接收天线的电磁耦合度较强。     

电磁兼容设计在电子武器和装备中的应用

针对传统电磁兼容设计运用在电子武器和装备中的缺点,运用一种先进的方法对其进行改进。在构思设计方案时先设计系统的能量传输模型和干扰关联矩阵,然后运用数值模拟、动态仿真、等效计算、数据统计等方法分析敏感器的安全性。通过对系统电磁兼容性预测、定量分配电磁兼容参数、重复优化设计方案,得到电磁兼容性能最优的设计方案。最后通过实例分析说明了系统设计方法在实际中的应用,具有很高的实用价值和发展性。     

舰艇作战系统电磁兼容的综合预测

分析了针对舰艇作战系统中电子系统的电磁兼容性的预测方法。针对舰载电子设备的电磁兼容问题,采用了一种综合分析的方法,通过综合考虑发射接收对之间的响应,利用发射机、接收机的辐射响应特性以及信道条件的数学模型,分析电子设备之间的电磁兼容性,对分析预测电子设备间的电磁兼容性具有一定的意义。     

旋转永磁式机械低频天线的系统设计与验证

为实现低频电磁发信系统的小型化和低功耗,面向旋转永磁式机械天线的理论研究和技术实践,提出了基于多物理场耦合仿真的系统设计和性能校验方法。设计了包含永磁磁源、高效驱动电机及其控制器在内的旋转永磁式机械天线系统方案。研制了实验样机,并对其系统性能和近区磁场进行了实验测试,验证了相关设计方法和系统方案的可行性与有效性。结果表明,该样机的磁场场强和尺寸等主要指标达到了美国“机械天线”项目在射频穿透技术领域的要求,为旋转永磁式机械天线方案研究和样机设计提供了一种可行思路。     

坦克外壳对内部电磁波的影响及其振荡干扰波型的数值计算

在坦克的金属立方体盒子模型下,分析了坦克外壳对内部电磁波的影响,并对Lc型电路激发的电磁波在坦克内部形成的振荡波型进行了计算,分析了该类电磁振荡波对坦克内部其他电子元件产生电磁干扰的作用机理,对一种最低频率的谐振波型进行了仿真模拟,提供了对坦克内部电磁波电场分量及磁场分量的一种分析计算方法,为研究坦克内部电子设备的电磁干扰规律提供了思路,对提高坦克的电磁兼容性能具有一定参考意义。     

无线馈能式电磁作动器设计

针对电磁作动器馈能时很难准确控制电磁阻尼力的问题,在分析电磁作动器阻尼特性的基础上,结合无线电能传输技术设计了无线馈能式电磁作动器与磁流变阻尼器并联的复合式馈能悬架系统,并对其减振性能和能量回收方法进行了研究。通过悬架系统台架试验,从车体垂直加速度变化幅度和无线电能传输天线端电压角度,验证了无线馈能时电磁作动器阻尼力可实现精确控制。     

前门耦合仿真平台的设计

从天线接收等效电路出发,用专业的电磁电路仿真软件设计并构建一类前门耦合仿真平台．该平台能弥补传统仿真中天线辐照与敏感设备传导之间的割裂,反映耦合过程,为整机电磁兼容与防护提供丰富细节和数据．该类仿真极具开放性,可依据敏感设备特点与候选仿真软件功能,自选相关软件构建该平台．最后以某型接收机为例,用三维电磁仿真软件CSTMWS完成天线辐照,在基于CSTDS和ADS的仿真平台下实现前门耦合模拟,得出接收机内部耦合数据,验证该类平台的实用性．     

车载指挥系统电磁兼容总体设计思想

目前武器系统中电磁兼容问题已成为大型武器系统中不可忽视的客观问题。提出了关于车载指挥系统电磁兼容总体设计的一些重要准则,分别对系统内各组成部分的屏蔽设计、结构布局设计、布线设计及接地设计进行了相关阐述。在实际的产品设计中应用这些设计准则可以大大加强车载指挥系统的稳定性和可靠性,提高了全系统抗电磁干扰的能力。     

增强导弹武器系统电磁兼容性的方法研究

以系统内和系统间的EMC设计、分析与预测技术为基础 ,利用有关武器系统EMC的历史数据、现场报告和理论分析结论 ,对在执行任务中的导弹武器系统进行电磁环境兼容分析预测 ,识别和测试系统中的潜在干扰发射 /响应设备对 ,并进行电磁干扰控制和电磁加固 ,以增强实际训练、作战中导弹武器系统的电磁兼容性能。该方法也可推广应用到其它复杂武器系统如多军、兵种联合行动中武器系统的EMC分析和电磁加固实践中 ,以有效地减小或消除各友邻武器系统相互之间的EMI影响。     

新型频率选择表面加载双极化超宽带紧耦合阵列天线

为使紧耦合阵列天线在超宽频带内实现电磁性能更佳、辐射性能更稳定的目的,提出一种新型条形频率选择表面宽角阻抗匹配层加载的双极化超宽带紧耦合阵列天线。通过高频仿真软件CST周期边界条件对阵列单元截断并进行研究分析。掌握阵元阻抗和辐射等电磁性能后,优化设计并加工出一个6×6单元的阵列天线进行实际测量。测量结果表明,该天线在2~12 GHz的频带内驻波比均小于3,驻波比带宽为10 GHz。带内辐射特性稳定,主瓣电磁能量集中,交叉极化小。工作频带内,最大增益可以达到13 dBi。该阵列天线可应用于超宽带相控阵天线领域中。     

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).     

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.     

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.     

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.     

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.     

Country survey XVI the defence sector in the economy of a declining superpower: Soviet Union and Russia, 1965-2001

The Soviet Union was able to develop a large military-industrial complex and become the world's second superpower despite deficiencies in its centrally planned economy because defence was given high priority status and special planning, rationing and administrative mechanisms were used to attain national security objectives. However, in the period 1976-85 the effectiveness of priority protection diminished and defence institutions experienced more of the problems typical of the shortage economic system. The heavy defence burden also created growing difficulties for the civilian economy. The attempts by the Gorbachev government to reform the defence sector and improve defence-economic relationships during perestroika (1985-91) uniformly failed. For most of the transition period, the Russian military-industrial complex has been adversely affected by its low priority status, cuts in defence spending, instability of the hybrid politico-economic system, and negative growth of the economy. The armed forces and defence industry have been reduced in size and their outputs of military services and equipment have fallen to low levels. Nevertheless, the Russian armed forces still have over one million troops, significant stocks of sophisticated conventional weapons, and a large nuclear arsenal. The government of President Putin has raised the priority of the defence sector, increased real defence spending, and adopted ambitious plans to revive Russian military power. It is likely, though, that tight resource constraints will hamper efforts to reform the armed forces and to upgrade weapons. By 2010 Russia will be an important, but not dominant, military power in Eurasia.     

Traffickers,terrorists, and a ‘new security challenge’: Russian counternarcotics strategy and the Federal Service for the Control of the Drugs Trade

The collapse of the Soviet Union precipitated the massive expansion of drug use and trade in Russia. The country now has one of the largest populations of injecting drug users in the world and has become the largest single-country market for Afghan heroin. In 2003 the Federal Service for the Control of the Drugs Trade was created to coordinate a comprehensive counternarcotics strategy appropriate to the scale of this threat. The service continues to face a number of challenges in its early stages of development. However, it has made considerable advances in improving responses to large-scale organised crime and in building international cooperation.