激光末制导炮弹比例导引律性能研究

通过分析激光末制导炮弹比例导引制导律几何关系和原理,研究了激光末制导炮弹的工作原理,建立了含非线性进动的激光陀螺式导引头动力学模型和线性化弹体模型的末制导炮弹比例导引回路模型.根据制导控制系统是否利用导引头非线性进动信号作为制导信号,建立了两种制导控制系统数学模型,采用不同的制导时间以及弹体参数,进行了末制导炮弹比例导引回路仿真,对比分析了两种制导控制系统的性能.最后,针对非线性系统易引起弹体姿态较大摆动的问题,提出了在制导时间有限时的基于衰减系数的激光末制导炮弹改进制导方案.     

烟幕干扰激光末制导炮弹的仿真研究

随着精确制导武器的大量应用,实现了常规弹药集群攻击模式向制导弹药精确打击模式的转变,从而达到了最优的作战性价比,其激光武器被广泛应用于军事领域,为有效对抗激光武器,烟幕弹以性价比高等优势受到各国的青睐。以烟幕干扰激光末制导炮弹为例,研究了激光末制导炮弹的制导原理,烟幕干扰激光末制导炮弹的原理,将烟幕对激光导引头的遮蔽效果引入到外弹道仿真过程,以脱靶量为指标,建立了干扰系统仿真模型,实现了烟幕对抗激光末制导炮弹的干扰仿真研究。研究结果表明,该仿真系统可以为烟幕弹对付激光末制导炮弹提供最佳干扰策略,为典型烟幕弹药的作战训练和效能评估提供辅助决策。     

诱饵诱偏条件下反辐射无人机攻击过程建模仿真分析

为实现对反辐射无人机(ARUAV)末制导阶段飞行姿态的动态分析,基于比相被动导引头测向跟踪理论和反辐射无人机飞行控制原理,在分析末制导阶段导引头天线视场内诱饵数量变化对反辐射无人机攻击姿态调整影响的基础上,建立了多诱饵诱偏条件下的无人机攻击动态模型,并在想定条件下仿真分析了末制导阶段无人机姿态随天线视场范围内辐射源数量分离变化而变化的全过程。仿真分析结果证明了模型的正确性。     

目标丢失对末制导炮弹末导段弹道特性影响

针对末制导炮弹受光电干扰及天气等因素影响,在末导段出现丢失目标以及丢失后重新捕获目标等情况,依据小扰动原理建立了比例导引模式下末制导炮弹控制模型,获取末制导炮弹的脱靶量、法向过载等与目标丢失时机以及丢失时间长短的解析关系,对目标机动特性不同情况下失去目标及重新捕获目标后的弹道特性进行了仿真,对比分析了目标静止及机动情况下仿真结果中各种指标变化的异同及原因。仿真结果表明,末导段目标丢失会对末制导炮弹弹道特性造成显著影响,尤其是在目标采取机动的情况下。     

利用窄波束实现反辐射无人机攻击闪烁诱饵研究

为有效对抗雷达诱饵闪烁诱偏，综合考虑无人机飞行姿态、导引头天线指向以及天线波束宽度等因素对天线视场范围内诱饵数量的影响，在导引头动态跟踪模型的基础上建立了无人机导引头制导飞行模型。仿真结果表明：窄波束导引头可引导无人机命中雷达闪烁诱饵布阵中的某部诱饵，最终实现对雷达摧毁。     

激光干扰光电成像导引头的建模与仿真

在建立形心跟踪式光电成像导引头模型的基础上,根据激光干扰光电成像导引头输出图像的特点,建立了亮斑干扰模型、亮斑加亮带干扰模型、全饱和干扰模型和致盲干扰模型.理论分析认为亮斑加亮带的干扰效果与亮斑干扰类似,致盲干扰的效果与全饱和干扰类似.利用研制的光电成像末制导干扰仿真软件,系统研究了典型应用下,激光干扰对形心跟踪式光电...     

捷联导引头积分比例导引制导精度

积分比例导引制导是适用于全捷联半主动激光导引头的一种典型制导方案。为解决该制导方案下的命中精度分析问题,提出了一种基于伴随法的精度分析方法。首先,建立了积分比例导引制导律模型,并给出了一种具有较强工程实用性的积分比例导引制导律实现方法;其次,在分析制导回路各项误差源特性的基础上,利用伴随法得到了各误差源对脱靶量的影响。分析结果表明,制导精度与比例导引导航比、自动驾驶仪的动态特性密切相关。得到的结论可以为工程上利用全捷联半主动激光导引头进行制导提供重要参考。     

激光导引头对目标测角精度的研究

激光探测器精确测量目标的方位角是导引头导向目标的必要条件,当前缺乏对该精度的理论研究,因此针对激光导引头的测角精度进行了研究.首先建立了制导激光的大气传输模型,并验证了导引头激光探测器接收到的制导信号光斑为均匀光斑;而后基于激光探测器检测目标方位角的基本原理,推导了目标方位角检测精度与光斑半径、光斑中心位置和信噪比的关系;最后通过仿真分析了不同因素对目标方位角检测精度的影响.结果表明:减小光斑半径、缩短光斑质心到光敏面中心的距离、增大探测器光学系统焦距、提高信噪比,均可以提高导引头对目标的测角精度.     

速率陀螺式激光导引头稳定跟踪原理分析与仿真

激光导引头是激光末制导武器(炮弹、炸弹和导弹)的核心部件,其性能优劣直接影响对目标的捕获、跟踪性能及命中精度,采用计算机仿真技术对激光导引头系统进行建模和仿真是一条有效评估其性能的途径.结合某速率陀螺稳定式激光导引头的结构特点,研究其空间稳定和跟踪的工作机理,并应用多体力学和空间飞行原理建立了该型导引头伺服系统的数学模...     

激光制导武器半实物仿真系统的设计与实现

首先,以某激光制导弹药为背景,提出了室内半实物仿真系统的总体设计方案,介绍了一种激光半主动导引头的工作原理。其次,在室内局限环境下,建立了弹目几何关系的数学模型,研究了导引头入瞳光学特性,并根据制导与控制系统的工作原理,设计了末制导段弹道的半实物仿真模型。最后,设置两种末端制导的初始条件,引入导引头和角速率陀螺等弹上部件进行多次弹道仿真试验。试验结果表明,基于该导引头和角速率陀螺的制导与控制系统设计合理,可以实现精确打击。     

Resolution Enhancement Technology:Integrated Process Solutions using OPC

DUV lithography, using the 248 nm wavelength, is a viable manufacturing option for devices with features at 130 nm and less. Given the low kl value of the lithography, integrated process development is a necessary method for achieving acceptable process latitude. The application of assist features for rule based OPC requires the simultaneous optimization of the mask, illumination optics and the resist.Described in this paper are the details involved in optimizing each of these aspects for line and space imaging.A reference pitch is first chosen to determine how the optics will be set. The ideal sigma setting is determined by a simple geometrically derived expression. The inner and outer machine settings are determined, in turn,with the simulation of a figure of merit. The maximum value of the response surface of this FOM occurs at the optimal sigma settings. Experimental confirmation of this is shown in the paper.Assist features are used to modify the aerial image of the more isolated images on the mask. The effect that the diffraction of the scattering bars (SBs) has on the image intensity distribution is explained. Rules for determining the size and placement of SBs are also given.Resist is optimized for use with off-axis illumination and assist features. A general explanation of the material' s effect is discussed along with the affect on the through-pitch bias. The paper culminates with the showing of the lithographic results from the fully optimized system.     

Cost-effective test solutions for smart card and other integrated flash applications

From its emergence in the late 1980s as a lower cost alternative to early EEPROM technologies, flash memory has evolved to higher densities and speedsand rapidly growing acceptance in mobile applications.In the process, flash memory devices have placed increased test requirements on manufacturers. Today, as flash device test grows in importance in China, manufacturers face growing pressure for reduced cost-oftest, increased throughput and greater return on investment for test equipment. At the same time, the move to integrated flash packages for contactless smart card applications adds a significant further challenge to manufacturers seeking rapid, low-cost test.     

Theoretical analysis of the relationship between the Brillouin gain coefficient and the strain in the optical-fiber sensors

The relation between the power of the Brillouin signal and the strain is one of the bases of the distributed fiber sensors of temperature and strain. The coefficient of the Bfillouin gain can be changed by the temperature and the strain that will affect the power of the Brillouin scattering. The relation between the change of the Brillouin gain coefficient and the strain is thought to be linear by many researchers. However, it is not always linear based on the theoretical analysis and numerical simulation. Therefore, errors will be caused if the relation between the change of the Brillouin gain coefficient and the strain is regarded as to be linear approximately for measuring the temperature and the strain. For this reason, the influence of the parameters on the Brillouin gain coefficient is proposed through theoretical analysis and numerical simulation.     

An improved parallel thinning algorithm with two subiterations

The parallel thinning algorithm with two subiterations is improved in this paper. By analyzing the notions of connected components and passes, a conclusion is drawn that the number of passes and the number of eight-connected components are equal. Then the expression of the number of eight-connected components is obtained which replaces the old one in the algorithm. And a reserving condition is proposed by experiments, which alleviates the excess deletion where a diagonal line and a beeline intersect. The experimental results demonstrate that the thinned curve is almost located in the middle of the original curve connectivelv with single pixel width and the processing speed is high.     

Novel fiber-optical interferometer with miniaturized probe for in-hole measurements

Today, micro-system technology and the development of new MEMS （Micro-Electro-Mechanical Systems） are emerging rapidly. In order for this development to become a success in the long run, measurement systems have to ensure product quality. Most often, MEMS have to be tested by means of functionality or destructive tests. One reason for this is that there are no suitable systems or sensing probes available which can be used for the measurement of quasi inaccessible features like small holes or cavities. We present a measurement system that could be used for these kinds of measurements. The system combines a fiber optical, miniaturized sensing probe with low-coherence interferometry, so that absolute distance measurements with nanometer accuracy are possible.     

Study of waveguide coupling efficiency in hybrid silicon lasers

This paper presents a new method to increase the waveguide coupling efficiency in hybrid silicon lasers. We find that the propagation constant of the InGaAsP emitting layer can be equal to that of the Si resonant layer through improving the design size of the InP waveguide. The coupling power achieves 42% of the total power in the hybrid lasers when the thickness of the bonding layer is 100 nm. Our result is very close to 50% of the total power reported by Intel when the thickness of the thin bonding layer is less than 5 nm. Therefore, our invariable coupling power technique is simpler than Intel＇s.     

Teleportation of an arbitrary unknown N-qubit entangled state under the controlling of M controllers

A new quantum protocol to teleport an arbitrary unknown N-qubit entangled state from a sender to a fixed receiver under M controllers(M < N) is proposed. The quantum resources required are M non-maximally entangled Greenberger-Home-Zeilinger (GHZ) state and N-M non-maximally entangled Einstein-Podolsky-Rosen (EPR) pairs. The sender performs N generalized Bell-state measurements on the 2N particles. Controllers take M single-particle measurement along x-axis, and the receiver needs to introduce one auxiliary two-level particle to extract quantum information probabilistically with the fidelity unit if controllers cooperate with it.     

Diode-end-pumped Nd:YVO4/LBO lasers with 4.2W continuous-wave output at 457 nm

A continuous-wave (CW) 457 nm blue laser operating at the power of 4.2 W is demonstrated by using a fiber coupled laser diode module pumped Nd: YVO4 and using LBO as the intra-cavity SHG crystal With the optimization of laser cavity and crystal parameters, the laser operates at a very high efficiency. When the pumping power is about 31 W, the output at 457nm reaches 4.2 W, and the optical to optical conversion efficiency is about 13.5% accordingly. The stability of the out putpower is better than 1.2% for 8 h continuously working.     

A rigorous proof of MIMO channel capacity’s increase with antenna number

It is well known that adding more antennas at the transmitter or at the receiver may offer larger channel capacity in the multiple-input multiple-output（MIMO） communication systems. In this letter, a simple proof is presented for the fact that the channel capacity increases with an increase in the number of receiving antennas. The proof is based on the famous capacity formula of Foschini and Gans with matrix theory.     

Call for Papers

正Wireless Body-area Networks The last decade has witnessed the convergence of three giant worlds:electronics,computer science and telecommunications.The next decade should follow this convergence in most of our activities with the generalization of sensor networks.In particular with the progress in medicine,people live longer and the aging of population will push the development of wireless personal networks