Interception probability simulation and analysis of salvo of two electromagnetic coil launched anti-torpedo torpedoes

Electromagnetic coil launch is an important branch of electromagnetic launch (EML) technology, which is suitable for launching anti-torpedo torpedo (ATT). This paper focuses on the EML parameters and the interception probability of the EML two ATTs salvo. Based on the launching model of a multi-stage coil launcher, the trajectory model of the ATT and the attacking torpedo, a calculation method for the EML two ATTs salvo parameters is proposed, with the conditions of capture and interception given reasonably. An adaptive particle swarm optimization (APSO) algorithm is proposed to calculate the optimal launching parameters, by designing the adaptive inertia weight and time-varying study factors. According to the analysis of the simulation with Monte Carlo method, EML will improve the interception probability effectively, and the interception probability is affected by the launching range. The results demonstrate good performance of the proposed APSO in calculating EML parameters for the two ATTs salvo in certain combat situation. Implications of these results are particular regarding the command and decision in the anti-torpedo combat.     

导弹单发杀伤概率影响因素分析

提出了进行导弹单发杀伤概率影响因素分析的必要性,进行了大量的导弹单发杀伤概率仿真计算,对作战条件和弹目交会条件等重要影响因素进行了深入地分析研究,并对导弹的作战使用、战术决策和目标机的最佳规避机动策略进行了深入探讨。研究成果给飞行员在导弹作战使用过程中进行战术决策提供了强有力的科学理论依据。     

索赔离散到达的风险模型

讨论了索赔到达时间和索赔额均服从几何分布的风险模型 ,利用逐段决定马尔可夫骨架过程的广义生成算子去构造有关盈余过程的鞅 ,精确求解了模型的破产概率     

基于马尔科夫链的一种评价方法

应用了数理统计与随机过程理论,从分析动态系统的状态以及状态转移情况给出了一种合理的评价方法,经过实例验证,该方法效果较好.     

多窗口谱图分析的低截获概率雷达信号识别

在当前复杂的战场环境中,低截获概率雷达信号因其具有大时宽带宽积、强干扰性能、高分辨率和低截获性特点得到了广泛应用,传统的雷达侦察手段很难对其进行有效识别.在低截获概率雷达典型调制分析的基础之上,研究基于人工智能的雷达信号分类识别方法.从低截获概率雷达信号时频特征入手,提出基于多窗口时频谱图分析方法.该算法采用Hermi...     

高功率微波径向线连续横向枝节阵列天线设计

为了实现Ku波段高功率微波的定向发射,研究并设计了新型高功率径向线连续横向枝节阵列天线。该天线采用圆极化同轴TE₁₁模式进行馈电,经双层径向线波导传输后,通过连续横向枝节单元向外辐射。天线工作在驻波模式,相邻两圈缝隙的径向间距为一个波导波长,在上层径向线末端放置短路金属杆,金属杆表面到最内侧缝隙的径向间距为半个波导波长,整个天线具有较高的增益和功率容量。仿真研究了一个工作在14.25 GHz的天线,天线的高度为80 mm,半径为285 mm。仿真结果表明:该天线具有35.3 dBi的增益和47%的口径效率,反射系数小于-25 dB,辐射效率超过99.0%,同时具有吉瓦级的功率容量。     

适应低时延业务需求的分布式可穿戴单兵作战信息系统

针对云计算应用在单兵作战系统场景下业务处理时延高、服务质量无法保障的问题,提出一种基于可穿戴计算的分布式单兵作战信息系统。利用士兵身上的可穿戴智能设备构建本地计算层,在作战地点就近处理计算数据,提供给士兵本地的信息处理与融合能力,并采用广义扩散负载均衡算法平衡各设备负载,降低业务处理时延;同时利用分布式计算的容错能力增强系统的可靠性。仿真结果表明,基于可穿戴设备的分布式本地网络架构能有效地降低作战任务的处理时延,同时增强系统的可靠性。     

Reforming the bras tendus? The Congolese National Police reforms, 2003–2016

The security sector reform (SSR) programme in the Democratic Republic of the Congo (DRC) has failed, according to a former high-level member of the United Nations (UN) mission in the DRC, as a large section of the country remains outside government control, and the security institutions of the state continue to constitute one of the predominant sources of insecurity for the local population in a number of ways. Based on several field studies, this article critically scrutinises the SSR of the Congolese National Police (Police nationale congolaise; PNC) and the efforts to reform it between 2004 and 2016. It further attempts to explain why so little progress was made in the SSR of the PNC, despite extensive involvement from donors. The article shows that the instrumental and traditional approach to SSR is partly to blame, because in this case it failed to address the root problems and initiate the needed fundamental reform and reconstruction of the police force. It also shows that reforming local security institutions becomes even more difficult when the local authorities do not support the effort.     

一类二阶Hamilton系统周期解的存在性

Hamilton系统是非线性科学中的一个重要领域,很多人在超二次或次二次条件及其他一些条件下对Hamilton系统的周期解进行了研究。此文则研究了非自制二阶Hamilton系统在零点局部环绕及“非二次”条件下周期解的存在性,并利用局部紧性条件(C)条件以及极大极小方法证明了其周期解的存在性。     

飞行器碰撞概率计算的一般方法

研究了飞行器碰撞概率计算的一般方法,这种方法通过飞行器和空间物体各自的状态矢量、位置误差协方差矩阵以及形状尺寸来计算飞行器和空间物体的碰撞概率。从位置误差协方差矩阵的一般形式出发,推导了飞行器的碰撞概率计算公式。在推导过程中,将飞行器的相对运动速度看作是方向不变的矢量,从而可以消去平行于相对速度的一维,将三维的概率计算问题转化为和相对速度垂直的相遇平面内的二维概率问题。针对二维概率问题分别研究了三种碰撞概率的计算方法,并比较了它们各自的优缺点。最后通过数值算例验证了三种方法各自的特点及正确性。