基于近距多天线技术多方位多目标模拟方法

利用雷达目标模拟器能够显著提升雷达试验、维护和训练等工作效益。提出利用近距多天线技术实现多方位多目标模拟,解决了雷达目标模拟器与雷达间距离、通道转换和目标模拟器参数设计等难题。最后通过仿真分析,给出了目标模拟器参数设计方法,具有重要的工程指导意义。     

数字阵列雷达多目标模拟器设计

在分析传统模拟相控阵雷达模拟器原理的基础上,提出了一种针对数字阵列雷达的多目标模拟器设计思路和方法。文中针对角度模拟,提出专用多通道数字模拟器和利用监测网络实现模拟的两种方案,并重点对后一种方案展开分析。利用内监测网络模拟多个不同目标,从而实现数字阵列模拟器的功能,为验证数字阵列雷达系统性能提供有效的手段。     

两坐标警戒雷达模拟器设计

介绍了两坐标警戒雷达模拟器的软、硬件设计。该模拟器对雷达真实回波进行模拟仿真,可有效检验两坐标警戒雷达的多目标检测跟踪性能与检测方式。     

雷达航路杂波模拟器

现化雷达已将计算机技术引入终端处理系统,为了调试数据处理程序和显示处理程序,我们开发研制了目标航路杂波模拟器。该模拟器可以模拟雷达的多目标环境及形式各异的目标航路。为了真实地模仿雷达的工作环境和目标特性,可以在模拟中引入地物杂波及雷达的测量误差和目标的扰动误差。本文在讨论了基本的数学模型之后,给出了航路杂波模拟器的实现算法及程序设计方法。     

多体制雷达视频模拟器设计及实现

详述了多体制雷达模拟器的设计思想及其实现方法,该模拟器采用嵌入式计算机PC104和高速大规模可编程逻辑器件FPGA相合的方法,能够模拟多种雷达体制的目标回波信号和杂波信号,该模拟器和接收、天馈、信号处理、终端数据处理组成雷达仿真系统对干扰机侦察设备进行测试和评估,也可作为实验设备用于信号处理机的调试、测试和评估,在同一硬件平台上,通过软件加载来满足各种不同体制的雷达目标、杂波模拟。     

一种多目标雷达视频信号模拟器的设计

详述了一种多目标雷达信号模拟器的设计思想及其实现方法，该模拟器采用计算机和高速处数字处理芯片相组合的方法，能够模拟多种复杂调制方式下的雷达发射信号和多目标在多种杂波和噪声情况下的相干回波信号，该模拟器可与信号处理机，数据处理机及显示器民闭环，便于在实验室内对雷达系统进行调试与评估以节省时间和资金，该模拟器信号频带宽很宽，实时性好，模拟器参数设置方便，对内部参数适当修改后可用于其它型号的雷达调试和调     

LFMCW雷达视频信号模拟器的研制

目标回波模拟在雷达系统的调试过程中有着非常重要的作用.本文介绍一种多目标雷达视频信号模拟器的设计和实现方案,该模拟器可以为线性调频连续波体制的多基地雷达系统的信号处理单元提供多个雷达目标在噪声环境下回波信号,为解决大数据量高数据率的雷达目标模拟提供了一个可行的解决途径.     

一种测量雷达目标模拟器的实现

提出了一种基于Virtex -II系列FPGA ,结合USB2 .0及大容量同步动态存储器SDRAM实现测量雷达目标模拟器的方法。重点对此测量雷达目标模拟器的数学模型及功能实现进行了比较系统的介绍 ,给出了实验结果 ,并分析了设计特点。该目标模拟器能够满足对高速目标进行回波模拟的要求 ,且降低了系统调试成本 ,减小了外场实验难度     

应用于多波段目标模拟器的微带滤波器设计

文章分析了四种滤波器的特点,提出了利用微带滤波器设计多波段雷达目标模拟器的设计方案,阐述了微带滤波器的设计原理及设计方法,设计了多波段雷达目标模拟器频率检测电路,计算了微带线三项参数,利用Ansoft-HFSS软件进行了仿真计算,结果满足设计要求。     

一种雷达回波实时模拟器

文章叙述了雷达系统模拟技术及其在现代雷达系统设计、分析、调试中的作用;讨论了一种雷达回波实时模拟器的组成要点及实现方法。该模拟器能模拟多个目标及各种常见杂波,产生的相干回波信号可直接注入信号处理机的输入端,通过该模拟器可将信号处理及主要的计算机系统构成闭环,在实验室里即可对各部分进行调试和评价,省去了许多外场实验的资金和时间。     

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.     

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.     

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.     

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.