基于空间分离点的非相参有源诱偏技术

随着现代电子对抗技术的迅速发展,对抗反辐射导弹(ARM)的有源诱偏技术关注度不断提高,利用有源诱饵抗ARM 是一种行之有效的方法。文中推导了非相参有源诱偏抗ARM的数学模型公式,根据ARM雷达导引头到达空间分离点前后提出了有源诱偏模型,并进一步对非相参两点源、三点源、四点源诱偏在不考虑空间分离点和考虑空间分离点两种情况下的诱偏效果进行了仿真与分析。结果表明:考虑空间分离点时,诱偏效果更好,而且更贴近实际。     

空地反辐射导弹抗点源诱偏全弹道作战仿真

论述了空地反辐射导弹在多点源诱偏作用下被动雷达导引头的瞄准方向,建立了导弹被动雷达导引头抗诱偏模型,分析了影响反辐射导弹抗诱偏效能的性能参数,并对其进行了仿真,得出了减小导引头分辨角是实现导弹抗点源诱偏的有效途径的结论.最后,结合导弹运动方程及导引方程对反辐射导弹抗三点源诱偏进行了全弹道数字仿真.仿真结果说明了仿真模型的可行性.     

有源诱饵抗反辐射导弹技术研究

反辐射导弹是现代战场上雷达的主要克星，而有源诱偏系统对抗反辐射导弹攻击是一种相对方便和有效的方法。就有源诱饵对反辐射导弹进行诱偏及其各种相关技术问题，包括诱偏系统参数的设置、诱饵间距配置、诱饵数量选取、诱偏系统作战布局等进行了系统阐述。对具有代表性的两点源诱偏效果给出了仿真分析，分析了反辐射导弹性能参数对两点源间距配置最佳间距和间距的上下限取值的影响。为工程上实现诱偏系统的设计和部署提供了理论基础。     

一种反辐射导弹抗有源诱偏性能的评估指标

基于对有源诱偏原理的分析,提出了一种反辐射导弹抗有源诱偏性能的评估指标--机动偏移量(MDI).作为函数,MDI能够准确地反映各常规参数对反辐射导弹抗诱偏性能的贡献;作为一个整体指标,MDI能够定量地评估和比较反辐射导弹的抗诱偏性能.仿真实验结果验证了MDI作为反辐射导弹抗诱偏性能评估指标的有效性.     

基于空间谱估计的反辐射导弹抗有源诱偏技术

相较传统反辐射导弹导引头无法有效抗有源诱偏干扰,提出改进的ESPRIT空间谱估计算法,可有效提高导引头角分辨力。理论仿真表明,改进算法可有效地使导引头较早分开雷达和诱饵辐射源,提高导引头抗诱偏能力。     

两点源诱偏辐射式仿真试验诱饵设置方法

抗诱偏能力是反辐射导弹作战性能的一项重要指标,通过在辐射式仿真试验系统中设置有源诱偏系统,可实现对反辐射导弹抗诱偏性能的检验与评估。介绍了反辐射导弹辐射式仿真试验的实现方法;利用合成场原理建立了反辐射导弹导引信号模型;通过仿真研究了改变诱饵的功率、点源间距及反辐射导弹来袭方向对攻击效果的影响。该方法的研究对反辐射导弹抗诱偏辐射式仿真试验中诱偏信号的设置和控制、作战效能的评估有重要的参考价值。     

闪烁诱偏条件下ARM对组网火控雷达的攻击效果评估

从火控雷达抗反辐射导弹的迫切需求出发,基于雷达组网理论,提出了组网火控雷达间歇辐射抗反辐射导弹方法;对非相干两点源干扰单脉冲雷达测角理论进行拓展分析,提出了两点源或多点源间歇辐射对反辐射导弹的闪烁诱偏方法;建立了反辐射导弹攻击效果评估模型,在设定的仿真背景下,对不同来袭方向的反辐射导弹的闪烁诱偏过程进行了仿真。结果表明,对于不同来袭方向的反辐射导弹,通过调整雷达的组网形式可以获得最佳的对抗效果。     

有源诱偏系统作战效能分析

随着现在电子战的迅速发展,抗反辐射导弹的技术也越来越受到广泛地关注,利用诱饵抗反辐射导弹是一种行之有效的手段。该文介绍了有源诱饵对反辐射导弹进行诱偏及其各种相关技术问题,包括有源诱偏原理、诱饵数量选取、诱偏系统布站方式等进行了系统阐述。文中对于三点非相干有源诱饵布阵技术抗ARM的效果进行了重点仿真分析,提出了合理的布阵方案。     

一种抗反辐射导弹诱偏系统时序设计及验证

有源诱偏系统可以极大减小雷达受辐射导弹攻击的概率,其诱饵信号与雷达信号的时序关系是直接影响诱偏效果的关键因素。针对某四点源非相干诱偏系统信号的时序关系做了相关分析,采用了三诱饵信号源覆盖雷达信号合成诱饵信号方法,对四点源信号的时序进行了设计与优化。利用某型号制导雷达的四点源诱偏系统开进行了反辐射效果验证,分析试验数据可知:该四点源时序设计与优化方法有效可行,提高了对反辐射导弹诱偏效果。     

反辐射导弹抗有源诱偏复合测向技术

针对反辐射导弹飞行过程中雷达导引头接收信号的变化,将导弹的抗诱偏过程分为两个阶段,提出了复合抗诱偏的方法。将单脉冲测向、超分辨DOA估计结合起来,分别运用于相应阶段中,理论上可以克服采用传统单脉冲测向体制的反辐射导弹容易被诱偏的缺陷。仿真实验结果验证了采用复合测向技术的雷达导引头在实现反辐射导弹抗诱偏方面的有效性。     

Development of the readout system for waveguide multilayer optical card

Waveguide multilayer optical card （WMOC） is a novel storage device of three-dimensional optical information. An advanced readout system fitting for the WMOC is introduced in this paper. The hardware mainly consists of the light source for reading, WMOC, motorized stages addressing unit, microscope imaging unit, CCD detecting unit and PC controlling ＆ processing unit. The movement of the precision motorized stage is controlled by the computer through Visual Basic （VB） language in software. A control panel is also designed to get the layer address and the page address through which the position of the motorized stages can be changed. The WMOC readout system is easy to manage and the readout result is directly displayed on computer monitor.     

Nanoimprint Lithography -A Next Generation High Volume Lithography Technique

IntroductionNanoimprint Lithography is a well-acknowl-edged low cost, high resolution, large area pattern-ing process. It includes the most promising methods,high-pressure hot embossing lithography (HEL) [2],UV-cured imprinting (UV-NIL) [3] and micro contactprinting (m-CP, MCP) [4]. Curing of the imprintedstructures is either done by subsequent UV-lightexposure in the case of UV-NIL or by cooling downbelow the glass transition temperature of the ther-moplastic material in case of HEL…     

Collinear phase-matching study of terahertz-wave generation via difference frequency mixed in GaAs and Inp

The collinearly phase-matching condition of terahertz-wave generation via difference frequency mixed in GaAs and InP is theoretically studied. In collinear phase-matching, the optimum phase-matching wave hands of these two crystals are calculated. The optimum phase-matching wave bands in GaAs and lnP are 0.95-1.38μm and 0.7-0.96μm respectively. The influence of the wavelength choice of the pump wave on the coherent length in THz-wave tuning is also discussed. The influence of the temperature alteration on the phase-matching and the temperature tuning properties in GaAs crystal are calculated and analyzed. It can serve for the following experiments as a theoretical evidence and a reference as well.     

Effects of the alloy compositions on the phonon-polaritons in ternary mixed crystals

Composition dependence of bulk and surface phonon-polaritons in ternary mixed crystals are studied in the framework of the modified random-element-isodisplacement model and the Bom-Huang approximation. The numerical results for Several Ⅱ - Ⅵ and Ⅲ- Ⅴ compound systems are performed, and the polariton frequencies as functions of the compositions for ternary mixed crystals AlxGa1-xAs, GaPxAS1-x, ZnSxSe1-x, GaAsxSb1-x, GaxIn1-xP, and ZnxCd1-xS as examples are given and discussed. The results show that the dependence of the energies of two branches of bulk phonon-polaritons which have phonon-like characteristics, and surface phonon-polaritons on the compositions of ternary mixed crystals are nonlinear and different from those of the corresponding binary systems.     

Influence of PVK ： NPB hole transporting layer on the characteristics of organic light-emitting devices

A doping system consisting of NPB and PVK is employed as a composite hole transporting layer （CHTL）. By adjusting the component ratio of the doping system, a series of devices with different concentration proportion of PVK ： NPB are constracted. The result shows that doping concentration of NPB enhances the competence of hole transporting ability, and modifies the recombination region of charge as well as affects the surface morphology of doped film. Optimum device with a maximum brightness of 7852 cd/m^2 and a power efficiency of 1.75 lm/W has been obtained by choosing a concentration proportion of PVK ： NPB at 1：3.     

New insert layer structure OLEDs

An insert layer structure organic electroluminescent device（OLED） based on a new luminescent material （Zn（salen）） is fabricated. The configuration of the device is ITO/CuPc/NPD/Zn（salen）/Liq/LiF/A1/CuPc/NPD/Zn（salen）/Liq/LiF/A1. Effective insert electrode layers comprising LiF（1nm）/Al（5 nm） are used as a single semitransparent mirror, and bilayer cathode LiF（1 nm）/A1（100 nm） is used as a reflecting mirror. The two mirrors form a Fabry-Perot microcavity and two emissive units. The maximum brightness and luminous efficiency reach 674 cd/m^2 and 2.652 cd/A, respectively, which are 2.1 and 3.7 times higher than the conventional device, respectively. The superior brightness and luminous efficiency over conventional single-unit devices are attributed to microcavity effect.     

Analysis of error performance on Turbo coded FDPIM

Due to variable symbol length of digital pulse interval modulation（DPIM）, it is difficult to analyze the error performances of Turbo coded DPIM. To solve this problem, a fixed-length digital pulse interval modulation（FDPIM） method is provided. The FDPIM modulation structure is introduced. The packet error rates of uncoded FDPIM are analyzed and compared with that of DPIM. Bit error rates of Turbo coded FDPIM are simulated based on three kinds of analytical models under weak turbulence channel. The results show that packet error rate of uncoded FDPIM is inferior to that of uncoded DPIM. However, FDPIM is easy to be implemented and easy to be combined, with Turbo code for soft-decision because of its fixed length. Besides, the introduction of Turbo code in this modulation can decrease the average power about 10 dBm, which means that it can improve the error performance of the system effectively.     

A method for calculating the center position of collimated light

It is a key problem to accurately calculate beam spots＇ center of measuring the warp by using a collimated laser. A new method, named double geometrical center method （DGCM）, is put forward for the first time. In this method, a plane wave perpendicularly irradiates an aperture stop, and a charge couple device （CCD） is employed to receive the diffraction-beam spots, then the geometrical centers of the fast and the second diffraction-beam spots are calculated respectively, and their mean value is regarded as the center of datum beam. In face of such adverse instances as laser intension distributing defectively, part of the image being saturated, this method can still work well. What＇s more, this method can detect whether an unacceptable error exits in the courses of image receiving, processing and calculating. The experimental results indicate the precision of this method is high.     

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.     

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.