雷达角跟踪系统检测的新方法

本文提出了雷达角跟踪系统检测的一种新方法——暂态特性测试法。文中介绍了该检测方法的原理及由CCD摄象传感器件、单片微机等组成的检测设备。分析了实验结果,讨论了提高检测精度的措施。     

时序逻辑的并行描述与隐含遍历

随着电路规模的迅速增长,设计验证越来越复杂,从而需要高速的数据处理系统。基于总线型多机系统环境,研究电路网表和布尔表达式的BDD（Binary Decision Diagram）并行构造方法,并通过隐含遍历任务的动态调度设计有效地完成时序逻辑的状态遍历。     

内外干扰因素对液体火箭发动机的影响分析

在已有的液体火箭发动机稳态工况的非线性数学模型基础上,计算分析了单干扰因素对液体火箭发动机参数的影响,用非线性方法和小偏差方法对比分析了两个干扰因素分别和共同对发动机参数的影响。所得结论可用于泵压式燃气发生器循环的液体火箭发动机试验结果分析、可靠性及故障分析,也揭示了此类发动机参数随各种干扰因素的变化规律     

基于离散降雨衰耗状态的卫星信道模型

针对Ka频段卫星信道中降雨衰耗的统计分布特点,建立了基于离散降雨衰耗状态的卫星信道模型,模型中各状态组成离散的Markov链并由其转移概率矩阵来表示,分析此模型下的信道误比特性能和数据包丢失性能。此模型能够适用于链路层以及高层通信协议。     

Violence and the state: Lessons from Colombia

Whether or not Colombia has improved is a controversial topic. If improvement has occurred, what, if any, lessons from the Colombian model can be learned? The first lesson is that Colombia's problems were caused more by a weak state than by drugs. The second lesson is that improving state capacity requires more than just increased security. The state must also provide the basic social services that citizens require to gain and maintain their support. Additionally, government institutions need to improve their professionalism, protect human rights, and root out impunity and corruption. The alternative is to suffer from new cycles of violence as old foes are vanquished, but new ones emerge.     

基于劣化度的装备健康状态评估模型

为了准确评估装备的健康状态,实施装备的状态维修,引入劣化度概念,结合装备的特点,确定了以装备特征参数劣化度为评估指标,运用变权模糊理论,建立了基于劣化度的装备健康状态变权模糊综合评估模型。结合地空导弹装备实际工作,进行了实例分析,验证了该方法的准确性和有效性。     

状态机嵌入DEVS的组合建模方法研究

DEVS提供了模块化、层次化的系统建模和仿真执行框架,但是缺乏对于系统行为的抽象建模能力。状态图扩展了原有的FSM,通过可视化的、灵活的状态迁移图描述系统的复杂行为。提出将状态图嵌入DEVS的组合建模方法,互为补充,以建立复杂的离散控制系统。DEVS作为系统的建模框架并提供执行逻辑支持,状态图扩展DEVS的事件交互机制和时间推进机制,描述系统的行为逻辑。详细介绍了状态图和DEVS的语法语义,重点阐述状态图嵌入DEVS的实现机制。结合一个应用实例,说明嵌入状态图的DEVS用于建立离散控制系统模型的优势。     

针对自适应滤波的组网雷达欺骗干扰优化策略

针对组网雷达系统在跟踪目标发生机动时采用自适应滤波来估计目标状态的特点,在点迹融合数据处理结构的组网雷达基础上提出了一种欺骗干扰优化策略.根据状态和量测方程描述了组网雷达跟踪目标的模型,同时建立了跟踪机动目标的自适应滤波模型.在此基础上,建立了欺骗干扰模型,并在目标机动检测约束下,推导了虚假目标欺骗干扰对于组网雷达融合...     

Why did Sudan Lose a small war in Southern Sudan?

ABSTRACT

When on the wrong end of an asymmetry in the projection of hard power, weaker sides countenance the grim arithmetic of avoiding direct and massed confrontations. Invariably, insurgents have over the ages tended to employ indirect tactical methods to render their stronger opponents ineffective. Ultimately – interest asymmetry, regime type, asymmetries of strategy, and external intervention – combine in a complex interplay and pattern, to militate against a strong side. In Sudan, these factors interacted throughout the civil wars to produce regional autonomy and finally an independent South Sudan in 2011. Similar strategic logic had confronted many large African states battling insurgencies in Ethiopia, Angola, Nigeria, Zaire, and apartheid-era South Africa. Oftentimes, weakening public resolve has caused these governments to accommodate, capitulate or withdraw even if they try not to blink. Notwithstanding the regime type, it can be concluded that the majority of strong actors are prone to fail in a protracted, asymmetric conflict. Hence, the notion of linking victory in counterinsurgency to the degree of openness (democratic polyarchies); or closeness (totalitarianism) – is still valid but highly contestable in the case of Africa’s large dysfunctional states.     

一种基于零控脱靶量的滑模末制导律设计

基于零控脱靶量的思想,提出一种能够有效针对大气层再入目标的滑模末制导律.首先,建立纵向平面内的弹目相对运动方程;然后利用扩张状态观测器对目标机动加速度信息进行估计,并对零控脱靶量算法进行分析,提出了制导律的设计思路;接着利用滑模变结构控制理论进行制导律的推导;最后进行仿真分析,仿真结果证明,所设计的制导律能够很好地对目标弹进行拦截,并且指令的跟踪效果也很好,从而验证了算法的有效性.