天基TDM-MIMO雷达系统抗干扰波形设计方法

针对天基MIMO脉冲雷达探测体制的发射波形设计问题,考虑到天基雷达的发射波形等相关参数极易被敌方侦察设备侦收到,提出了一种新的抗干扰天基TDM-MIMO雷达波形设计方法.结合雷达系统的信号处理流程,建立了基于复合模糊函数的波形设计参数化模型,以表征雷达探测性能的发射信号集复合模糊函数和表征抗欺骗干扰的正交性来优化设计雷...     

侦察传感器优化管理技术研究

现代战场环境下,战场目标种类繁多、千差万别,对侦察传感器探测的时效性、准确性和连续性要求更高。在实际的战场侦察情报系统中,很少采用单一的目标传感器,往往是合理地使用各种侦察传感器,综合运用各种侦察手段,迅速制定多种运用方案进行比较和选优,并能有效组织侦察行动,实施全天时、全天候、大范围、连续不间断的侦察监视,迅速、及时、准确、高效地获取情报。研究了部队侦察传感器管理的作用、研究范围、技术现状和发展过程,提出了部队侦察传感器管理的通用模型和传感器管理方法,可以大大提高多传感器信息融合系统的精度,合理充分利用传感器资源,提高信息融合系统的整体效能。     

基于CI的雷达与通信侦察航迹融合算法研究

针对异类被动传感器中的定位跟踪问题,提出了一种基于协方差交集（CI）的雷达与通信侦察航迹融合算法。将雷达侦察设备和通信侦察设备侦收到的信息分别通过扩展卡尔曼滤波（EKF）算法得到目标的航迹,再通过CI算法将两条航迹进行融合。仿真实验结果表明,融合后的航迹具有更高的准确度。     

传感器尖峰信号整流器的优化设计与实现

传感器尖峰信号会产生高次谐波,干扰传感器设备的正常运行,造成大量的能耗。当前方法主要通过提升信号整流器前端电感值,降低谐波对传感器的干扰,破坏系统的稳定性。提出基于自抗扰控制的传感器尖峰信号整流器设计方法,将尖峰信号整流器的直流母线电压的输出当成系统扰动,设计自抗扰控制器的定位和动态弥补功能,改进传统设计,增强传感器的抗扰动性能,给出软、硬件设计方法。测试结果表明,优化设计的整流器动态性能良好,网侧电流谐波明显减少,制约了尖峰信号滤波器形成的谐振干扰,达到预期效果。     

最大访问间隔时间与成像侦察卫星星座

以区域成像侦察为背景,基于遗传算法提出了一个成像侦察卫星星座设计方法。研究了通过遗传算法模型优化设计侦察卫星轨道高度、轨道倾角、右升交点角及平近点角等轨道参数的方法。并对有3颗低轨道卫星的侦察卫星星座进行了优化仿真。结果表明,优化后的星座不仅在指定目标区域具有优异的最大访问间隔时间性能,而且具有一定的全球侦察能力。     

面向目标搜索的异类多传感器协同指示引导

针对地面防空武器系统中多传感器资源管理问题,研究了面向目标搜索的主动被动传感器协同指示引导子问题.推导了三维异地配置下被动传感器对主动传感器的指示引导模型,根据被动传感器对目标的作用范围讨论了指示引导范围,结合传感器量测过程中的量测误差和传感器的站址误差建立了指示引导误差模型,在此基础上计算了被动传感器对主动传感器成功...     

一种基于MSPDAF的通抗/雷抗侦察信息融合跟踪算法

在电子对抗侦察系统中,传感器会受到干扰而导致目标跟踪效果下降。将多传感器概率数据互联滤波(MSPDAF)的融合方法运用到电子对抗侦察领域,将通抗侦察和雷抗侦察的观测数据进行融合处理。计算机仿真结果说明:该方法能解决单传感器被干扰时目标跟踪精度下降的问题,在提高电子对抗侦察系统的抗干扰能力方面有实用价值。     

侦察卫星星座的轨道高度分析

以区域侦察为背景,基于遗传算法提出了一个侦察卫星星座设计方法。研究了通过遗传算法模型优化设计侦察卫星轨道倾角、右升交点角以及平近点角等轨道参数的方法。分析了轨道高度与最大访问间隔时间之间的关系。基于7种不同轨道高度对有3颗低轨道卫星的侦察卫星星座进行了优化仿真。结果表明,优化后的星座不仅在指定目标区域具有优异的最大访问间隔时间性能,而且具有一定的全球侦察能力。     

非高斯噪声情况下多平台机动目标被动跟踪新方法

针对仅有角度测量信息条件下,被动传感器融合目标跟踪问题,提出了扩维UKF滤波算法;并对经典IMM进行改进提出变维IMM算法,利用不同维数模型之间的交互式融合解决对机动目标的跟踪问题;进一步考虑实际情况中往往存在的测量噪声为非高斯情况,引入自适应滤波方法。最终提出变维交互式多模型自适应抗差扩维无迹滤波方法（VDIMM-AAUKF）,成功实现了被动多传感器在高斯和非高斯噪声情况下对机动目标跟踪。仿真实验结果表明该算法跟踪精度高、稳定性好,具有较好的实际应用价值。     

主被动传感器实时信息融合的STMHM算法

 主、被动传感器实时信息融合是同时实现目标跟踪和目标识别的重要途径,构建STMHM(空时二维多假设模型)算法来解决该问题.首先,设计主、被动传感器的融合数据模型,并分别构建两类传感器的目标量测空间,设计STMHM的融合空间;其次,提出主、被动传感器量测空间时间初始化方法,并设计模型的滤波算法,给出适应于该算法的信息融合评判规则;最后,设计空中态势,运用该算法对数据进行融合,验证算法的有效性.     

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.     

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.     

Preparation and Characterization of TaN ALD Precursors

High purity organic-tantalum precursors for thin film ALD TaN were synthesized and characterized.Vapor pressure and thermal stability of these precursors were studied.From the vapor pressure analysis,it was found that TBTEMT has a higher vapor pressure than any other published liquid TaN precursor,including TBTDET,TAITMATA,and IPTDET.Thermal stability of the alkyl groups on the precursors was investigated using a 1H NMR technique.The results indicated that the tertbutylimino group is the most stable group on TBTDET and TBTEMT as compared to the dialkylamido groups.Thermal stability of TaN precursors decreased in the following order:TBTDET ＞ PDMAT ＞ TBTEMT.In conclusion,precursor vapor pressure and thermal stability were tuned by making slight variations in the ligand sphere around the metal center.