蜂群无人机数据链自组网协议设计

针对蜂群无人机的国内外发展现状,设计了蜂群数据链组网技术方案,将遥测数据通过窄带和宽带数据链分别传输,通过数据链自组网完成遥控和遥测,增强了测控的可靠性;同时,设计集群数据链自组网协议栈,针对介质访问控制(MAC)协议和路由协议进行设计。基于QualNet和STK的通信网络仿真平台,针对无人机集群数据链的MAC协议和路由协议进行了仿真性能评估,验证了统计优先级多址接入(SPMA)协议的可行性,实现无人机之间不需要预约信道和时隙进行自组网通信,确保了高优先级业务的实时性。     

基于i.MX6无人机视频码率受控的压缩系统设计

针对无人机数据链视频数据信道带宽受限要求,采用飞思卡尔i.MX6的嵌入式视频处理硬件平台,设计无人机视频H.264压缩码率受控系统,解决压缩编码的运动估计搜索范围、最大关键帧间距问题,在数据传输中采用SPI接口缓冲区码率控制机制,控制系统SPI输出码率受限的设计。实验测试表明,设计的视频处理系统视频压缩数据受控,可根据无人机无线信道设计要求,完成无人机视频压缩编码码率可控视频传输。     

无人机数据链系统抗干扰性能评估方法研究

为解决无人机数据链系统抗干扰性能评估问题,首先采用最低性能约束给出了无人机数据链系统抗干扰性能指标;然后,应用层次分析法,构建了无人机数据链系统抗干扰性能评估模型,利用实验测试结果确定了比较矩阵,避免了应用专家系统主观性强的缺点,实现了无人机数据链系统抗干扰性能的定量评估。实例验证了该评估方法的正确性和实用性。     

基于低轨道卫星中继的无人机数据链路方案

基于低轨道卫星通信技术,针对高空长航时无人机系统,建立以卫星中继的通信数据链模型.从传统数据链入手,分析其存在的弊端和使用的局限性,并融合现代通信技术,在引用新型编码技术的基础上,给出了新的无人机通信数据链路方案.该设计方案以无人机作战使用实际为基础,极大地提高信息传输能力和信息安全性.     

对无人机数据链的电子制约策略

随着无人机的战场运用越来越广泛,反制无人机的研究也迫在眉睫,对无人机数据链的电子制约就是反制无人机的一种重要手段。分析了反无人机"软"、"硬"2种杀伤手段,从"断链"、"致盲"、"毁伤"3方面讨论了电子制约对无人机系统的作用机理,重点论述了对无人机数据链压制、欺骗的电子制约策略,并对无人机数据链电子制约的未来发展作了简单展望。     

航空短波数据链动态TDMA协议设计

航空短波数据链是民用航空通信系统不可或缺的通信手段之一。针对短波资源有限、传输速率低的特点,提出了航空短波数据链动态TDMA协议,引入短波微时隙的使用,进一步提高信道利用效率,增加了系统容量,满足短波业务实时变化的需求。设计了航空短波数据链系统的仿真场景,分析了动态TDMA协议给航空短波通信系统带来的性能提升。仿真结果表明,设计的动态TDMA协议可以满足数据链的应用需求。     

JTIDS消息字还原模块的FPGA设计

根据公开的关于Link16数据链的信息标准并结合我军对战术数据链的具体要求,设计了一种JTIDS终端消息字还原模块,该模块包含CCSK码字解密,CCSK译码,解交织,RS译码等一系列基带数据处理过程。首先介绍了Link16数据链消息字还原模块的原理,对其各个子处理模块进行了设计并提出了硬件实现方案,然后在Quartus II环境下选择Cyclone II系列的EP2C8Q208C8 FPGA芯片进行了JTIDS消息字还原模块的系统级综合与仿真,并在该芯片的开发板上进行了验证,硬件成品可用于JTIDS终端功能测试与评估等多种场合。     

基于半实装的无人机模拟训练系统研究与设计

针对传统面向无人机地面操控手测控训练任务的模拟训练系统存在的缺点,分析了面向无人机地面操控人员测控训练任务的主要特点,提出了一种基于实装地面测控站的无人机半实物仿真训练系统结构框架,设计了典型无人机模拟训练系统的结构层次和系统运行模式,与传统面向地面操控手的无人机仿真训练系统相比,所提出的仿真系统架构具有逼真度高、易于实现和复用、开发技术成熟等优点,在提高训练效率、节省训练成本方面具有重要应用价值。     

数据链互连技术分析与应用

数据链互连是数据链系统一体化建设的关键技术,也是提高体系作战能力的关键因素。针对数据链网络互连问题,从数据链系统的硬件结构、网络结构和数据流程入手,探讨了从不同网络层次、不同硬件结构和转发不同数据实现数据链互连的方法及特点,对数据链互连技术的发展和数据链系统一体化建设进行了分析。     

基于RTX的实时测控系统软件设计

从无人机半物理仿真试验的整体结构出发,针对实时测控系统的需求,采用了一种较为新颖的Windows+RTX实时性方案,完成了无人机半物理仿真试验中实时测控系统的研制.既满足了试验的实时性要求,又具有很好的用户交互特性,对测控技术的发展及其在国防科技等相关领域中的应用均有重要的参考价值.     

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).     

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.     

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.     

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.     

The UK,interrogation and Iraq, 2003–2008

The UK’s interrogation operations during the conflict in Iraq (2003–2008) are often portrayed by the media as involving significant amounts of mistreatment. This article demonstrates that these practices are not necessarily representative of the UK’s interrogation operations across this conflict. In doing so it contributes to the limited literature on the practice of interrogation and on the UK’s combat operations in Iraq. The UK’s interrogation capability, and therefore its intelligence-gathering capability, is shown to have rested primarily with the military’s Joint Forward Interrogation Team (JFIT). The JFIT suffered from limitations to the number, training and experience of its interrogators and interpreters. It is argued that maintaining a permanent, higher level of preparedness for interrogation by the British armed forces is desirable.     

Remembering and forgetting Mirambo: Histories of war in modern Africa

ABSTRACT

While the study of organised violence is considered essential to understanding the history of the West, and accordingly imbued with various layers of meaning and remembrance, war is widely regarded as inimical to the modern nation in Africa and stable development more broadly. Using examples drawn from primarily from East Africa, this paper considers the ways in which warfare in the deeper (‘precolonial’) past has been framed and envisioned in recent decades, in particular by governments whose own roots lie in revolutionary armed struggle and who began life as guerrilla movements. While in some cases particular elements of the deeper past were indeed mobilised in pursuit of contemporary political goals, in many other scenarios histories of precolonial violence were beheld as problematic and unworthy of remembrance. This paper highlights the paradox and ambiguity which has attended the memory of key aspects of Africa’s deeper past.