线性调频雷达信号特征研究

分析了线性调频雷达信号的时城、频域、时频城特征，给出理想压缩输出的时、频城参数，分析了失配处理对压缩性能带来的影响，针对脉压雷达信号的使用给电子战接收机带来的低截获的难题，提出了一种截获LPI雷达信号的方法。     

天线与天线系统

Y99-61608-990 0007718基于失配算法的压缩接收机旁瓣抑制=Compressivereceiver sidelobes suppression based on mismatching algo-rithms[会,英]/Simic,I.S.& zejak,A.J.//1998 IEEE5th International Symposium on Spread Spectrum Tech-niques & Applications,Vol.3 of 3.—990～993(HG)本文描述了精确说明压缩接收机工作的雷达模糊函数,这种方法的许多重要好处是在压缩接收机领域雷达信号设计方法用于模糊函数成形的可能性,也描述了模糊函数成形结果。成功设计了压缩滤波器,它能抑制旁瓣而接收机的分辨率又无明显恶化。参11     

雷达接收机动态范围的研究

叙述了接收机输入信号功率变化的各种影响因素以及相参雷达和非相参雷达接收机动态范围定义.说明了相参雷达接收机动态范围的下限和上限2种定义以及动态范围、系统增益设计与ADC分辨率的匹配关系.分析了动态范围压缩的各种技术和非相参雷达接收机动态范围压缩的2种方法.     

对MIMO雷达信号测频效果比较

为了测试典型雷达对抗侦察接收机对多输入多输出(MIMO)雷达信号的测频效果,首先分析了MIMO雷达信号的特点,建立了信号模型,然后分析了4种典型接收机对MIMO雷达信号侦察的处理过程,最后对几种接收机的侦察效果进行了仿真对比。     

RCS动态测量雷达幅度相位校准技术

某相参雷达散射截面积(RCS)动态测量雷达可采用脉冲压缩技术,其接收机信号输出幅度、相位校准需要有标准信号源,目前国内能够买到的国外综合信号源,远不能满足校准要求.文中采用等效自校准原理,研制了RCS动态测量雷达幅度、相位校准系统,解决了采用脉冲压缩技术的RCS动态测量雷达的幅度、相位校准问题.     

高温超导压缩EW接收机的设计与实现

随着信息技术的发展,未来战场电磁环境越来越复杂,为了满足未来战场对雷达信号的接收和处理需求,设计了一种基于高温超导滤波器的电子战(EW)接收机,对高温超导压缩EW接收机的频谱分析功能进行了原理分析,根据原理分析结果给出了EW接收机完整设计方案,对该设计方案进行了主要性能的分析.通过系统测试对设计方案的可行性进行了验证,结果表明该接收机在实时处理、带宽扩展、灵敏度提升等方面较传统接收机优势明显.     

干扰背景下MIMO雷达部分相关信号设计

在干扰背景下,集中式MIMO雷达可以通过设计发射波形提高系统的输出信干噪比,然而优化后的波形通常会具有较高的自相关旁瓣,降低了接收机对弱目标的检测性能。该文提出一种干扰背景下MIMO雷达部分相关信号设计方法。该方法在兼顾发射信号峰均比(PAPR)的同时,在发射天线对正交恒模波形进行加权处理,并以最大化接收机系统的输出信干噪比为准则建立目标函数,给出一种基于拟牛顿法的连续优化算法求解目标函数,获得最优加权,使得系统的输出信干噪比得到提升。仿真结果表明,该方法能够有效地抑制干扰,并可自适应地将发射信号能量辐射向目标方向,提高系统输出信干噪比。     

随机信号雷达抗干扰性能分析

研究了采用带限高斯白噪声波形的随机信号雷达在噪声和欺骗干扰环境下的工作性能.通过研究接收机输入/输出信噪比关系和检测性能,分析了随机信号波形抗噪声干扰的性能;采用仿真方法,分析了抗欺骗干扰性能.仿真和分析结果表明,随机信号波形比线性调频脉冲压缩波形具有更好的抗欺骗干扰能力.     

基于DCS 的统计MIMO 雷达信号模型及参数估计

分布式压缩感知(Distributed Compressed Sensing, DCS)将单信号的压缩采样扩展到信号群的压缩采样,利用信号内相关性和互相关性对多个信号进行联合重构。统计多输入多输出(Multiple-Input Multiple-Output,MIMO)雷达系统通过多发多收配置,在发射机、目标以及接收机之间构成对目标的分布式探测系统。该文将DCS应用到统计MIMO 雷达中,通过对该场景中目标回波的延时在距离空间稀疏性的分析,提出联合所有接收信号重构目标场景的设想,建立了接收信号的联合稀疏模型,并实现了目标参数估计的联合重构算法。仿真结果表明与基于压缩感知(Compressed Sensing, CS)的算法相比,基于DCS 的算法在进一步降低采样数目的同时提高了参数估计精度,同时也验证了DCS-MIMO 雷达可以有效克服目标的雷达散射截面积(Radar Cross Section, RCS)起伏。      

三坐标雷达软件仿真系统中自动增益控制模块的实现

自动增益控制（AGC）系统能够较好地防止因信号动态范围过大引起的接收机饱和或截止。由于工程应用中A/D变换器的位数有限，使雷达接收机的输出动态范围受到了限制，而AGC可以压缩接收机的输入动态范围，使输出动态范围满足A/D变换器的要求，所以它在雷达接收机中得到了广泛的采用。本文简要介绍了三坐标雷达的基本概念和三坐标雷达软件仿真系统的构成，结合该软件仿真系统的工作特点，主要探讨了一种在本系统中简便易行的AGC方法，并给出了其动态范围压缩性能的评估。     

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.     

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.     

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.     

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.     

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     

JOURNAL OF ELECTRONICS(CHINA)

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NOTICE OF CHANGING JOURNAL OF ELECTRONICS （CHINA） TO MICROSYSTEMS ＆ NANOENGINEERING

正Journal of Electronics(China)(JE)was founded in 1984,sponsored by the Institute of Electronics,Chinese Academy of Sciences.JE is one of the first English academic journals in China in the field of Electronics and Information technology.The journal was published quarterly since it was launched in 1984 to 2003,then it is published bimonthly till now.During