共查询到20条相似文献,搜索用时 687 毫秒
1.
2.
3.
4.
5.
6.
7.
进行了一次名叫独立战术制导验证(UTGV)的挂飞试验计划,把空军低成本惯性制导系统(LCIGS)作为捷联惯性基准装置。用于独立战术制导验证的捷联滤波、导航滤波和对准滤波软件已开发出来,并在承包商的处理机上实现。计划的第一阶段试验了惯导系统试验模型,第二阶段试验了工程模型(工业惯导系统)~+。在惯导系统试验模型测试过程中,无线电、惯性综合靶场测量系统(CIRIS)作为主导航基准变换用于校准和标定,而纯惯性的载机惯性导航系统(CAINS)用于工业惯导系统试验。地面和飞行试验是在Holloman空军基地用中央惯性制导试验设备(CIGTF)完成的。本文介绍承包商的室内试验、以及用中央惯性制导试验设备进行的地面试验和飞行试验的结果。 相似文献
8.
舰载捷联惯导动基座 F-QUEST 初始对准方法 总被引:2,自引:0,他引:2
针对目前基于惯性系的捷联惯导动基座对准方法信息利用率不高及矢量观测选取不确定性导致对准精度下降的问题,提出了一种新的舰载捷联惯导动基座滤波四元数估计(filter quaternion estimation,F-QUEST)对准方法。构建了捷联惯导动基座初始对准模型,并利用姿态矩阵链式法则将惯导初始对准转化为姿态确定问题,进而采用 F-QUEST 算法求取姿态矩阵以实现捷联惯导动基座对准。车载试验结果表明:相比传统方法,新方法具有更高的对准精度和更快的收敛速度,水平姿态角误差只需3 s 即可收敛到0.01°。 相似文献
9.
10.
舰载惯导系统自对准中鲁棒滤波参数的选取问题,直接关系到惯导系统对准性能.基于矩阵链乘规则和重力加速度信息的惯性系分解方法,梳理了舰载捷联惯导系统自主精对准算法流程,并针对舰载条件下风浪等外界未知干扰,分系泊和等速航行两种情形,研究了H∞滤波器调节因子的选取规律和调节因子恒定时不同海况对对准性能的影响规律,为实际应用中γ因子的合理选择提供参考.仿真结果表明,舰载环境下γ因子恒定时,海况的不同对对准性能的影响较小.同时,无论是系泊条件和等速航行条件,鲁棒滤波器中调节因子γ的临界值相同,且γ越小系统稳定性越好,但滤波精度越低.γ逐渐增大,滤波精度逐渐增高,但增加到一定数值时滤波精度反而降低. 相似文献
11.
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. 相似文献
12.
Lord Aikins Adusei 《African Security Review》2013,22(3):332-359
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). 相似文献
13.
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. 相似文献
14.
Paul Rich 《Small Wars & Insurgencies》2013,24(1):39-56
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. 相似文献
15.
Jelmer Brouwer 《Small Wars & Insurgencies》2013,24(5):835-856
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. 相似文献
16.
17.
John Hussey Ian F.W. Beckett Hew Strachan Michael T. Isenberg 《Small Wars & Insurgencies》2013,24(1):158-163
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 相似文献
18.
19.
20.
Aleksander Zdravkovski 《Small Wars & Insurgencies》2013,24(5-6):941-963
ABSTRACTWhat 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. 相似文献