基于0.18um CMOS 工艺的GPS/北斗双模可重构接收机射频前端

设计了一种GPS/北斗双模可重构接收机射频前端,支持GPS L1和北斗B1两种工作模式,较单模接收机在可用性、连续性和完好性等方面具有优势。此射频前端采用低中频架构,混频器、中频滤波器等关键模块可重构,硬件复用的同时减少了芯片面积、降低了系统功耗。测试结果表明,在1.8V电源电压下,电压增益为103dB,功耗37.8mW,GPS L1和北斗B1波段噪声系数均小于3.2dB,芯片面积为2.263×2.098mm₂。     

Deviant globalization: the application of strategic landpower*

In both Afghanistan and Iraq, US landpower was able to gain control rapidly over terrain. However, that control ebbed as US presence weakened. Non-state actors, such as the Taliban, the Haqqani network, the Islamic State, and Al Qaeda, gained control of segments of the population. Transnational Criminal Organizations capitalized on this permissive environment to strengthen their networks, often eroding the legitimacy of the host nation government, fueling regional instability, and, ultimately, undermining US policy objectives. The proliferation of deviant globalization, or the connectedness of subversive elements, is a key indicator of future conflict. Strategic landpower is uniquely positioned to influence the physical, psychological, economic, and social interactions of various non-state actors and their association with deviant globalization. It is no longer enough to seize and hold terrain. Landpower must also have the capability to influence the actions and attitudes of populations on that terrain wherever and whenever these interactions occur.     

用于卫星干扰源定位的压缩感知DOA估计方法

针对传统测向方法的实际应用性能较差,提出一种基于压缩感知(CS)的卫星干扰源定位方法。根据干扰信号方位角的空间稀疏性,建立了压缩感知波达方向(DOA)估计模型。通过协方差矩阵的高阶幂逼近信号子空间和矩阵的共轭对称特征,利用高阶幂矩阵的主对角线下左下角列向量进行波达方向估计。仿真实验验证,该方法不需要已知干扰源数,具有较高的精度和较好的分辨力,且能满足对相干干扰信号的估计。对压缩感知DOA估计在卫星干扰源定位中的应用具有一定参考意义。     

军用电传动车辆混合动力系统能量管理技术

混合动力系统是军用电传动车辆具有优越性能的基础,能量管理技术则负责实现负载需求在系统中各动力源间的合理分流及部件的优化控制,是军用车辆混合动力系统研究的关键技术之一。分析了军用车辆混合动力系统的特点,研究了其对系统能量管理的影响,总结了当前能量管理技术研究现状,最终,针对当前能量管理技术存在的问题提出了相应的解决方案。     

隐身飞机突防建模及低可探测性轨迹规划

针对隐身飞机突防飞行规划,分析了隐身飞机对警戒雷达网突防过程问题特性,建立了雷达探测模型与组网警戒雷达信息融合模型;综合考虑隐身飞机的隐身能力、预警时间和燃料消耗将隐身飞机低可探测性轨迹规划问题形式化为一个复杂多目标非线性连续时间最优控制问题;并提出基于伪谱法的低可探测性轨迹规划方法。仿真实验实现了在组网警戒雷达下隐身飞机的低可探测性突防轨迹规划,证明了方法的可用性和有效性。     

AFRICOM: hard or soft power initiative?

The United States (US) Africa Command (AFRICOM) was launched in 2007, ostensibly to foster African security. Rather than focusing on traditional military operations, AFRICOM also embraces non-military activities such as humanitarian aid and African development. This begs the question as to what type of power (hard or soft) the US intends to wield through AFRICOM. Several US official statements have emphasised the soft power attributes of this military project. To this end, this article seeks to respond to two fundamental questions. First, is AFRICOM a soft power project? Second, how, if at all, has AFRICOM enhanced perceptions of the US in Africa? The article concludes that sceptical and negative perceptions of AFRICOM inhibit its soft-power objective of winning the hearts and minds of the African people.     

The EU Global Strategy and diplomacy

The new EU Global Strategy has significant implications for EU diplomacy, in terms of both goals and means. This article first analyses the timing of the strategy as an exercise in diplomacy in its own right. Second, it argues that the strategy outlines a more expansive and noticeably more smart power-oriented approach to diplomacy in practical terms. Finally, it notes that the strategy has a new meta-narrative for EU diplomacy, which seeks to project a blend of both realistic assessment and idealistic aspiration.     

信息支援条件下协同空战态势评估研究

针对现有空战态势评估方法表现形式不够直观、模型简单的问题,提出一种将威力场与遗传神经网络相结合的态势评估方法,并将其应用于信息支援条件下的协同空战态势评估.分别从攻击能力、探测能力、电子干扰能力、生存能力、通信能力、告警能力、协同能力以及决策能力等方面构建威力势模型.利用遗传算法优化BP神经网络,并将其应用于编队作战能力评估.最后利用具体算例进行仿真验证,结果表明该方法是正确可行的.相比于传统态势评估方法,该方法在信息支援条件下的超视距协同空战态势评估中具有全面性、直观性、准确性等优势.     

雷达对抗侦察装备作战能力的ANP幂指数评估方法

针对雷达对抗侦察装备综合作战能力对电磁环境的依赖性,提出一种基于网络层次分析法(Analytic Network Process,ANP)的雷达对抗侦察装备在不同电磁环境下作战能力的幂指数评估方法。通过对雷达对抗侦察装备作战任务及复杂电磁环境下的表现进行分析,确定装备作战能力指标;利用ANP分析各指标间的相互关系,计算出指标相对的权重;把该权重作为各指标的幂指数,计算雷达对抗侦察装备在不同电磁环境下的作战能力指数;最后结合某型装备多次不同环境下试验的数据,对该装备的综合作战能力进行评估。     

某型履带车辆液压助力变速操纵系统仿真

应用AMESim软件对某型履带车辆液压助力变速系统建立仿真模型,调整系统中部分参数为模型注入故障信息,对系统进行了故障仿真,获得了系统异常动态特性与系统元件故障之间的联系,为该系统的故障诊断提供了参考依据。结果证明该仿真模型可模拟实际系统的故障响应。