非合作式传感器空间运动目标截获概率研究

为了实现非合作式传感器对空间运动目标的有效捕获,在分析kalman滤波误差协方差矩阵的基础上,建立了传感器对目标跟踪误差的空间分布模型,并利用该模型提出了一种基于联合高斯分布的截获概率计算方法。该方法经过降维处理,降低了截获概率计算的复杂度,提高了运算的实时性。仿真实验表明,所提算法具有良好的估计性能。最后,对截获概率的误差来源、影响因素进行了深入的分析并得出了相关结论,可为实际工程应用提供了一定的参考价值。     

基于模糊逻辑的导弹扩展比例导引律

临近空间高超声速大机动目标的拦截制导律一直是现代制导与控制方面的一个难点和热点。运用模糊逻辑的方法，改进了扩展比例导引律，使导弹在拦截过程中能够有效跟踪导弹至目标视线转率的变化及目标的机动加速度，拦截末段视线转率收敛，实施成功拦截。     

阻塞流下阀门内漏率的声学检测与计算

通过对3种阀门在阻塞流下气体内漏的声学检测实验研究,分析阻塞流下气体内漏率与声源振幅的关系,得出二次截流对内漏声源强度的影响规律,提出采用临界阻塞点(n=1.893)声源振幅计算阻塞流下阀门内漏率,并拟合得到实验阀门压比与声振幅的计算式。另外,还采用k-ε二方程湍流模型模拟3种实验阀门的内漏流场,证明了闸阀和球阀内漏过程中存在二次截流现象。     

GSM系统合法侦听体系结构研究和设计

在分析了合法侦听原理的基础上分析了合法侦听的接口HI1,HI2,HI3三种不同接口实现不同的功能。HI1主要实现鉴权, HI2主要实现被侦听用户的活动信息传送,HI3则是实现被侦听用户的通信内容的传送。根据三种接口给出了GSM系统的合法侦听体系结构和实现GSM合法侦听的系统模型。     

基于BP神经网络的地空导弹武器系统作战效能评估

地空武器系统拦截巡航导弹的作战效能评估,运用3层BP神经网络进行.先通过层次分析法或专家打分法获得原始训练样本,再对样本进行归一化处理,最后编辑神经网络应用程序.结果表明:在选定指标的基础上,BP神经网络对武器系统作战效能评估是合理的.     

导弹防御中指挥控制通信系统效能评估方法

采用系统学中由上而下的分析方法,将目标弹看作时间敏感性目标,对弹道导弹的拦截概率进行建模.在分析弹道导弹时间特性的基础上,提出了基于拦截概率的指挥控制通信系统效能评估方法,建立了指挥控制通信系统的效能评估模型,并利用该模型对指挥控制通信系统的效能进行分析.仿真算例表明基于拦截概率的效能评估方法是有效可行的.     

三网融合后网络通信的合法侦听技术和解决方案

随着三网融合的不断推进,基于IP（互联网）的多媒体电子通信手段层出不穷,并已经开始影响到我们工作、学习,生活、娱乐,社交等的方方面面,因此对电子通信网络的监管和保障电子通信的安全性尤为重要。各国的执法机构正在寻求基于IP数据网络的合法侦听解决方案,来与当今的互联网犯罪,比如木马侵入、计算机入侵、身份盗用、数据盗用、互联网病毒攻击、有关恐怖分子以及毒品交易等违法行为作斗争。传统的电话通信时代的侦听手段和机制已经失效了,有技术原因,但更重要的是今天急剧扩张的网络规模,变化莫测的网络行为等,需要有新的侦听机制和手段。本文描述了在今天的互联网,特别是三网融合后的高速宽带IP网络,网络通信的合法侦听所面临的挑战,现代侦听技术的发展状况和标准化进程,以及基于业务路由器的现代合法侦听解决方案。     

8098单片机系统失控快速恢复方法

在恶劣的工业现场环境，工业测控系统难免要出现失控现象，本文就８０９８单片机系统失控的原因进行了分析并针对其提出了一些简单实用的系统失控快速恢复的软硬件措施。     

The collection efficiency of a particle-loaded single filter fiber

The collection efficiency η(M) of single fibers, both isolated and within a parallel array, was determined as a function of accumulated particle mass for Stokes numbers St=0.3–3 and interception parameters In=0.04–0.32. This regime is dominated by inertia, interception and particle bounce. Measurements were made with an optical in-situ particle counting technique. Monodisperse polystyrene aerosols (1.3, 2.6, 3.6 and 5.2 μm) were deposited onto steel wires of 8 and 30 μm, respectively. Particle accumulation reached values on the order of M=0.5–1 μg/mm fiber, corresponding to 10⁴–10⁶ particles per mm, depending on size.η(M) was found to increase for all operating conditions between about 2 and nearly 50 fold, most strongly however for those conditions were the bare fiber is ineffective as a particle collector, i.e. for very low or very high values of St number, corresponding to low collision or low adhesion probabilities, respectively. The absolute efficiency increased to values approaching or exceeding unity, i.e. the effective fiber collision cross-section exceeded the diameter of the bare fiber. For fibers within an array of parallel fibers (equivalent packing density ∼0.004), the initial efficiency η₀ was higher than for an isolated fiber by almost an order of magnitude. However the increase with loading was substantially smaller, typically by an order of magnitude.The efficiency increase can be described by a power law of the type where b and c are empirical fit coefficients. Within an array, the exponent c is on the order of 0.7±0.05, but lower than reported in earlier work on fiber arrays which suggest a value near unity. For isolated fibers, c→1 as interception becomes dominant (at very low flow velocities) while at high impact velocities and significant particle bounce c≈0.5. The coefficient c correlates with fiber Reynolds number, but not with other parameters. The coefficient b is inversely proportional to η₀ (consistent with earlier work, however with significantly lower values than previously published) and a function of (St/R)².The experimental section of the paper is preceded by a literature review on single-fiber efficiency data and models for the inertia-interception regime, including both information on bare fibers and dust loaded fibers. An improved, general fit function with physically meaningful limits for St→0 and St→∞ is proposed for the efficiency of bare fibers.