激光角度欺骗假目标干扰空域评估技术研究

针对目前激光角度欺骗干扰效果评估中存在的实时性差、可视化程度不高等问题,构建了激光角度欺骗假目标干扰空域评估系统。首先依据透视投影原理求解漫反射板假目标的距离及姿态参数,然后通过分析漫反射板假目标的干扰机理,以干扰距离为基础,推导出了漫反射板假目标干扰空域评估模型,最后依托系统设计了相关实验。实验中,分别对相对设备0°、120°和240°三个方向上布设的漫反射板用不同功率激光进行照射,然后用评估系统设备对三个漫反射板进行参数测量,最终得到系统接收的能量密度平均值分别2.70×10?13 J/mm2, 2.17×10?13 J/mm2和4.08×10?13 J/mm2,通过假目标干扰空域评估模型计算出在45°威胁角下的干扰最大距离分别为2045.6 m、1860.4 m和2470.0 m。最终分析了干扰空域大小与武器威胁角的关系,得到在20°、45°和70°威胁角下的假目标干扰空域的态势图。实验结果表明:在实验条件下,漫反射板假目标的干扰空域范围随系统接收能量增大而增大;武器来袭方向与漫反射板法线方向夹角越小,漫反射板假目标的干扰空域越大。以干扰距离作为评价指标,对漫反射板假目标干扰空域进行评估,可为假目标干扰效果评估提供技术支持。     

无人机多假目标欺骗式干扰效能研究

无人机多假目标干扰是一种重要的欺骗干扰样式。分析了无人机多假目标干扰效果的评估指标,建立了多假目标数量计算和标准化模型,最后利用单目标突防被击中模型和突防成功目标数模型对无人机多假目标在不同干扰距离下的干扰效果进行了定量分析,并用仿真计算加以验证。     

真假目标热特性差异的理论分析

根据传热学原理,建立了假目标和真目标的简单传热模型,计算了一日内假目标和真目标温度随时间的变化,结果表明:假目标表面温度可以通过热平衡方程求解;真目标温度日变化受厚度的影响最大,厚度越大,温度变化越平缓,厚度越小,越接近假目标.表面发射率对真目标或假目标温度变化有相同的影响,发射率越低,一日内表面温度就越高.太阳能吸收系数仅在白天具有太阳辐射时对温度有影响,它与发射率对温度的影响刚好相反.     

距离目标像欺骗干扰的效果分析

国外在研与现役雷达大多采用线性调频脉冲压缩技术,为了对其进行有效的欺骗干扰,利用数字射频存储(DRFM)技术,采用时移,幅度加权和移频调制的方法,分别产生静止假目标,整体运动假目标以及有局部运动的假目标,模拟一定信干比条件下的雷达回波与干扰经该类雷达的信号处理过程,对其进行距离速度欺骗.分析当干扰存在时合成目标像位置及运动速度偏离真实目标像位置速度的程度.当干扰能量变大时,合成目标的参数就越接近于干扰假目标的参数,从而隐藏了真实目标的方位与运动状态,取得较好的干扰效果.     

基于欧氏距离度量的综合动态无线资源管理

本文采用欧氏距离度量作为越区切换和接入控制的判决依据,研究了综合动态无线资源管理,综合考虑了五项无线资源管理任务.欧氏距离度量与解调信息序列相结合,可以提供准确可靠的信道质量度量.仿真结果显示在特定的业务质量限制下,综合无线资源管理方案选择合适的门限和算法,通过在各个目标和任务之间进行必要的折衷和综合考虑,可以增加系统容量和达到较好的综合性能.     

假目标无人机系统的作战效能建模及模拟

本文阐述了假目标无人机在作战中的作用,给出了满足干扰成功的条件,建立了无人机侦察模型、假目标数量计算模型、假目标距离计算模型和速度计算模型,并给出了作战模拟的实现方法,最后分析了其作战效能.     

LFM脉冲压缩雷达的随机移频多假目标干扰技术研究

针对LFM脉冲压缩雷达回波信号距离和多普勒频率存在耦合这一特点, 在阶梯波移频干扰的基础上, 提出了随机移频的干扰方法。在雷达回波信号中心频率正负二分之一带宽内附加随机的多普勒移频分量, 可产生分布在真实目标周围的随机假目标。随机移频干扰技术产生的假目标随机性强, 使得雷达无法通过假目标频率补偿得出真实目标的位置, 并且随机移频产生的假目标相对于雷达是部分适配的, 因此假目标在一定程度上会展宽, 当附加随机移频点接近于雷达中心频率时, 产生的假目标甚至可以覆盖真实目标, 从而达到较好的干扰效果。     

一种改进型海尖峰背景下的目标检测算法

为了避免由于海尖峰造成的虚警现象,提出一种改进型海尖峰背景下的目标检测算法.根据海尖峰与运动目标在连续距离单元和连续脉冲构成的距离-方位二维区域中多普勒频率变化程度的差异,可以在一定程度上剔除由海尖峰形成的假目标.通过距离维多普勒频率稳定度、方位维多普勒频率稳定度可以相对准确的描述多普勒频率在距离-方位二维区域中的变化...     

有源假目标极化识别方案的设计与性能分析

本文研究了有源多假目标的极化识别及其性能评估问题.首先给出了极化雷达对目标和有源假目标干扰的接收信号模型,然后根据有源真假目标回波特性的差异提出了识别检验量,并给出了有源假目标的极化识别方案.最后,研究了识别检验量的统计特性,从理论上分析、评估了真假目标极化识别的性能.     

激光欺骗干扰中的关键参数分析

针对影响干扰效果的因素——干扰机功率、假目标设置距离、干扰激光超前量,推导了所需干扰功率的表达式,通过建立真、假目标和导引头之间的位置关系模型,讨论了假目标的设置距离与导引头高度、导引头光轴高低角和方位角的关系,得出一般应用条件下,假目标的设置距离。分析并得到了干扰信号与制导信号的概率密度函数,给出针对不同波门宽度的时间超前量的最优值,得出减小干扰信号的时间稳定性可使干扰信号进入波门概率增加的结论。     

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.     

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.     

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.     

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.     

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.