机载相控阵雷达STAP原理及其干扰方法研究

空时二维自适应处理技术(STAP)具有优越的杂波抑制性能,作为一种关键动目标检测技术,在机载和天基雷达中得到了广泛的应用。首先介绍了机载雷达的杂波几何模型,阐述了机载相控阵雷达STAP技术的基本原理,然后从其弱点和局限性出发探讨了对其可能的几种干扰方式,并详细解释了其干扰机理,为机载相控阵雷达STAP干扰技术的具体实现打下了基础,具有一定的工程应用价值。     

雷达

TN95 94051268机载雷达空时二维信号处理(续)/保铮,张玉洪,廖桂生,王永良,吴仁彪(西安电子科技大学)/j现代雷达一1094,(2)一17一27 图26参17(许)扰背景和多目标情况下均具有最好的检测性能,并且其参考滑窗单元幅位排序时间还不到05一cDAR的 一半.图1表2参12(许)1,N95 94051269机载相控阵雷达时空二维杂波的仿真/任迎舟,张玉洪(西安电子科技大学)lj现代雷达一1994,(2)一28~36 文章给出了一种机载相控阵雷达时空二维杂波相干视频信号的计算机仿真方法,其中考虑了雷达系统参数,载机姿态角和阵元幅相误差等多种实际因素.因而具有较好的通用性…     

机载雷达杂波特性及工程中的目标检测技术

针对机载雷达地杂波谱的分布特性,讨论了机载PD和相控阵两种体制雷达的工程可实现的地面目标检测方法,重点研究了空时二维处理技术在机载相控阵雷达杂波抑制中的应用,仿真结果证明3DT-SAP方法能有效改善杂波抑制性能,具有良好的工程应用价值.     

相控阵技术在机载火控雷达中的应用

在现代战争中,先进的战斗机对掌握制空权起非常重要的作用。近些年来,随着对战斗机远程打击能力的要求不断提高,机载火控雷达作为战斗机的"千里眼",其性能也越来越受到重视。为了适应这种需求,人们将相控阵技术与机载火控雷达相结合,实现了战斗机探测距离的巨大飞跃。本文在简要介绍相控阵技术的基础上,主要对其在机载火控雷达中的应用进行了分析。     

《电讯技术》专题资料《雷达探测技术》题要（六）

毫米波有源相控阵雷达及其系统设计（石星） 描述了毫米波有源相控阵雷达的特点和应用,讨论了直升机载毫米波有源相控阵火控雷达的系统设计,对设计中的几个关键问题进行了较详细的探讨。预测了直升机载火控雷达的发展方向。     

机载有源相控阵火控雷达发展现状及趋势

概述了世界各国机载有源相控阵火控雷达的发展情况,介绍了国外目前在研制的机载有源相控阵火控雷达,总结了机载火控有源相控阵雷达的发展趋势.     

模拟技术与模拟装置

0328754一种典型的机载相控阵雷达仿真系统[刊,中]/韩红//系统工程与电子技术.—2003,25(7).—873-877(D2)雷达系统仿真的主要目的是建立雷达系统的数学模型和电磁场环境。雷达信号处理和数据处理的仿真主要是针对选择的算法完成参数寻优。讨论了机载相控阵雷达系统的建模和仿真。从功能实现的角度描述了虚拟机载相控阵PD雷达系统的实现,并给出了一个在局域网内实现的仿真系统结构。参7     

Radant透镜体制低成本相控阵雷达技术的研究

一种基于Radant透镜体制的相控阵雷达技术,将传统二维扫描相控阵雷达的移相单元数由M×N个变为M N个,由于移相单元数的大幅度减少,使得二维扫描相控阵雷达的制造成本大幅度降低.目前,Radant透镜体制的相控阵雷达已经得到了工程应用,但透镜的插入损耗较大仍是需要进一步研究的课题.Radant透镜技术的使用,将使二维扫描相控阵雷达的应用领域更加广泛.     

机载相控阵雷达软件可靠性测评环境建设

针对相控阵雷达的特点及目前的使用现状,研究其软件可靠性测评环境建设。提出了机载相控阵雷达主机软件的可靠性测试环境要求,进行机载相控阵雷达主机软件的可靠性测试环境建设,实现了机载相控阵雷达主机软件的可靠性测试环境仿真软件设计。     

PIN管的微波特性及其应用

第三讲 PIN管的应用(二)——相幅控制相幅控制器件,尤其是相控器件,在相控阵雷达中有广泛的用途,是相控阵雷达的关键部件之一。在相控阵雷达的每个辐射单元输入处接入电控移相器,改变其相位,可以快速地改变天线阵的相位波前,从而控制波束辐射方向。也可通过电控移相器来控制波     

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.