激光成像雷达扫描性能的检测精度

为实现对激光成像雷达扫描系统性能的高精度检测,完成了激光束扫描性能检测设备的研制.对该设备的检测精度进行了分析,着重研究了提高设备检测精度的方法,根据检测设备的检测原理和使用特点,提出了在数据处理环节校正光学系统畸变和利用二次成像法精确测量光学系统焦距的方法,使检测设备对扫描角的检测精度提高一个量级,实验及分析结果表明:采用上述改善精度方法后,该设备对扫描角的检测精度可以达到1.2 mrad.改进的设备可以对扫描成像激光雷达的扫描系统性能作高精度的检测.     

一种靶场多目标成像测量雷达系统

靶场试验中,多目标测量一直是业界的难题。特别是对于分导式多弹头导弹、子母弹等新式武器,其抛撒出的子弹群往往具有小、密、快等特点,对常规兵器试验靶场测量设备提出了严峻的挑战。针对这一难题,介绍了一种基于高分辨成像体制的靶场多目标测量雷达系统,给出了该体制雷达的系统工作原理、主要指标设计方法,并结合静、动态试验结果对系统性能进行了分析,初步验证了系统对暗弱多目标测量的有效性。     

现代雷达电子侦察设备靶场试验方法研究

本文通过对现代雷达电子侦察设备分析，确定雷达电子侦察设备鉴定试验对靶场的试验要求，并根据国内外靶场发展状况，提出了符合我国特点的雷达电子侦察设备靶场试验方法。     

长波红外激光成像雷达技术的研究进展

文中论述了长波红外激光成像雷达国内外最新研究进展。以CO2激光成像雷达为典型代表,分析了长波红外激光成像雷达（与短波红外和中波红外相比）所拥有的技术优势。其中CO2长波红外激光成像雷达已步入技术成熟阶段,现现高帧频、小型化、多用途波导CO2激光成像雷达方向发展。随着近年来最子级联半导体激光器（QCL）迅猛发展,全固化QCL激光成像雷达,将是未来长波经外激光成像雷达技术研究的热点之一。     

高帧率步进频穿墙成像雷达扫频方法

步进频是穿墙成像雷达的常用波形,传统采用锁相合成技术的步进频穿墙成像雷达的跳频时间长,帧率很低,难以满足穿墙雷达实时成像的要求。为了解决这个问题,提出了一种新的扫描方案,可以通过现场可编程门阵列（FPGA）实现对扫描方式的可调控制,在不影响回波波形及成像效果的情况下显著提高了步进频穿墙成像雷达的帧率。在2 MHz的频率步长以及2.5 GHz的频段范围内时,实际成像帧率可以达到14 Hz,在一定程度上满足了实时成像的要求。试验测试结果验证了所提方法的可行性。     

星载合成孔径雷达并行二维成像处理的实现

星载合成孔径雷达是一个二维成像雷达系统,其记录的雷达原始数据是二维不可分离的,把以,把雷达原料数据处理成聚焦的雷达图像是一个二维的成像处理过程。二维数字信号处理对计算系统的性能要求较高,需要很大的内存空间和很高的计算速度,传统的计算机难以胜一文基于大规模并行计算机平台,分析了星载合成孔径雷达的二维成像算法,设计了二维快速傅里叶变换的并行新算法,有效地实现了星载合成孔径雷达原始数据的并行成像处理。     

旋翼无人机调频连续波雷达滑轨成像及特性分析

对旋翼无人机的精细化特性分析是提高雷达对“低慢小”目标分类和识别能力的关键。从目标距离-方位二维雷达成像的角度出发，利用K波段和太赫兹两个波段的调频连续波（FMCW）雷达，实现对旋翼无人机目标的滑轨成像。首先，建立了雷达滑轨成像的信号处理模型，给出了回波距离-方位二维聚焦的实现方法。其次，从雷达波段、调制带宽、扫频周期、滑轨长度、成像时间等多个角度分析和比较雷达成像性能的影响因素。最后，选取三种不同尺寸的典型旋翼无人机，利用两个波段FMCW雷达开展成像实验。实测数据分析表明:无人机在静止状态下，成像散射点能够较为精确地反映目标的物理结构；悬停状态受旋翼转动的影响，回波幅度增强，在距离和方位向能量发散程度与叶片长度和转速有关，并表现明显的微动特性，利用旋翼对无人机主体运动的调制和扰动特性，可用于后续的目标分类和识别。      

条纹管激光成像雷达数据处理系统分析与设计

条纹管激光成像雷达(STIL)的大视场、高帧频、高空间分辨率和时间分辨率等特点要求其数据处理系统具有相应的高性能。通过简要分析条纹管激光成像雷达数据处理的内容及性能要求,对条纹管激光成像雷达数据处理系统进行了分析和设计。简要介绍了条纹管激光成像雷达的典型系统结构,通过详细分析条纹管激光成像雷达数据处理内容,将所需处理的数据分为延时触发信号和条纹图像两类分别进行研究。根据系统指标要求,对比不同时序控制方案的优缺点,设计了基于Altera可编程控制(CPLD)的高精度可调谐数字延时控制子系统,以保证系统各部件严格按既定时序运作,实时捕获目标条纹图像并进行处理;通过对比不同的图像处理系统实现方案,分析系统硬件成本、建立周期和开发难度等因素,设计了以智能相机为核心的条纹图像处理系统。在此基础上,初步建立起条纹管激光成像雷达数据处理硬件平台。     

轨道飞行目标的雷达回波模拟及成像

逆综合孔径雷达（ＩＳＡＲ）是国内９０年代初新兴的一个课题，近几年对空中目标成像的取得了很大的进展，本文通过计算目标后向散射场来模拟轨道飞行目标的ＩＳＡＲ回波，讨论模拟和成像过程并给出模拟成像结果，同时分析了轨道飞行目标成像对雷达重复频率和相干积累时间的要求。     

基于深度学习的雷达成像技术研究进展

成像雷达具有全天时、全天候、远距离、高分辨对地观测的能力,使得雷达系统具有对观测区域进行成像和解译的能力。利用先进信号处理技术实现实时高分辨成像以满足图像解译的需求是雷达成像技术研究的重要目的和意义。随着深度学习的迅速兴起,深度学习网络在逆问题求解中得到广泛应用,也为提升成像质量和成像效率提供新的求解思路。本文基于雷达成像数学模型将雷达成像问题建模为成像逆问题,从逆问题求解的角度分析了基于深度学习的雷达成像方法的可行性。并综述了近年来雷达深度学习技术在合成孔径雷达（Synthetic Aperture Radar,SAR）、逆合成孔径雷达（Inverse Synthetic Aperture Radar,ISAR）、SAR运动目标成像等雷达成像领域的研究现状,在此基础上探讨了目前面临的亟待解决的问题,并对未来发展方向进行了展望。     

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.     

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.     

Teleportation of an arbitrary unknown N-qubit entangled state under the controlling of M controllers

A new quantum protocol to teleport an arbitrary unknown N-qubit entangled state from a sender to a fixed receiver under M controllers(M < N) is proposed. The quantum resources required are M non-maximally entangled Greenberger-Home-Zeilinger (GHZ) state and N-M non-maximally entangled Einstein-Podolsky-Rosen (EPR) pairs. The sender performs N generalized Bell-state measurements on the 2N particles. Controllers take M single-particle measurement along x-axis, and the receiver needs to introduce one auxiliary two-level particle to extract quantum information probabilistically with the fidelity unit if controllers cooperate with it.     

Diode-end-pumped Nd:YVO4/LBO lasers with 4.2W continuous-wave output at 457 nm

A continuous-wave (CW) 457 nm blue laser operating at the power of 4.2 W is demonstrated by using a fiber coupled laser diode module pumped Nd: YVO4 and using LBO as the intra-cavity SHG crystal With the optimization of laser cavity and crystal parameters, the laser operates at a very high efficiency. When the pumping power is about 31 W, the output at 457nm reaches 4.2 W, and the optical to optical conversion efficiency is about 13.5% accordingly. The stability of the out putpower is better than 1.2% for 8 h continuously working.     

Call for Papers

正Wireless Body-area Networks The last decade has witnessed the convergence of three giant worlds:electronics,computer science and telecommunications.The next decade should follow this convergence in most of our activities with the generalization of sensor networks.In particular with the progress in medicine,people live longer and the aging of population will push the development of wireless personal networks     

Call for Papers—Feature Topic,Vol.12,No.7,2015

正Information Centric Networking Information-Centric Networking(ICN) is an emerging direction in Future Internet architecture research,gaining significant tractions among academia and industry.Aiming to replace the conventional host-to-host communication model by a data-centric model,ICN treats data content as the first