机载RWR/ESM信号感知通道中脉冲交叠分析

脉冲交叠是影响RWR/ESM系统效能的重要因素之一。针对典型四通道比幅测向体制的RWR/ESM系统中因分频段、分象限形成的多通道信号感知结构,采用仿真方式,对多辐射源信号进入RWR/ESM系统后的脉冲交叠情况进行了统计,发现RWR/ESM信道中脉冲交叠的规律:N(N\2)脉冲交叠比N-1脉冲交叠基本上低一个数量级;且脉冲交叠对不同辐射源信号序列有不同影响,脉冲交叠同时使得后续的脉冲正确配对比率比较低。     

基于脉冲样本图的机载RWR/ESM辐射源威胁评估

辐射源威胁评估是机载雷达告警器/电子支援措施(RWR/ESM)的重要功能,为了提高机载RWR/ESM设备应对复杂电磁环境的能力,建立了基于脉冲样本图的威胁评估专家系统,通过雷达威力模型确定了以脉冲样本图为输入的评估指标,运用TOPSIS方法,使得评估系统客观、有效,贴近电子战要求,符合机载RWR/ESM工作流程。仿真证明了评估系统的有效性及可行性。     

分频段RWR/ESM脉冲重叠概率分析

当前战场电磁环境非常复杂,雷达脉冲信号非常密集,脉冲重叠是雷达告警器/电子支援(RW R/ESM)接收机面 临的重要问题之一。从理论上对分频段RWR/ESM接收机的脉冲重叠概率进行了分析,推导 出多频段RWR/ESM接收机的脉冲重叠概率计算公式。仿真结果虽然验证了分频段可以降低RWR /ESM接收机的脉冲重叠概率,然而固定的分频段方式并不能使得脉冲重叠概率最小;对于确 定分频段数量的RWR/ESM接收机,在特定的电磁环境下,存在最佳的频段划分方式可使RWR /ESM接收机的脉冲重叠概率取得最小值。     

RWR/ESM系统的“虚警”和“漏警”

RWR/ESM系统中对于诸如“虚警”、“漏警”等概念,经常从理论上和应用上混淆。结合RWR/ESM系统实际信号处理流程和功能,从信号统计检测理论出发,对比雷达/通信相关概念,发现传统意义上的“虚警”、“漏警”已不足以描述RWR/ESM对威胁的检测识别错误,为此基于多元假设检验理论,结合信号威胁等级,重新梳理RWR/ESM系统中信号检测类型的概念,将RWR/ESM的“虚警”、“漏警”拓展为带威胁级差的“虚警”、“漏警”,增加“同级差错”概念,并初步探讨其概率、代价因子等相关特性。     

RWR/ESM系统的“虚警”和“漏警”

RWR/ESM系统中对于诸如“虚警”、“漏警”等概念,经常从理论上和应用上混淆。结合RWR/ESM系统实际信号处理流程和功能,从信号统计检测理论出发,对比雷达/通信相关概念,发现传统意义上的“虚警”、“漏警”已不足以描述RWR/ESM对威胁的检测识别错误,为此基于多元假设检验理论,结合信号威胁等级,重新梳理RWR/ESM系统中信号检测类型的概念,将RWR/ESM 的“虚警”、“漏警”拓展为带威胁级差的“虚警”、“漏警”,增加“同级差错”概念,并初步探讨其概率、代价因子等相关特性。     

时分制RWR/ESM处理方法对脉冲丢失的影响

随着战场电磁环境日趋复杂,当前体制下的RWR/ESM正逐渐暴露出其误警率高、漏警率大和告警时间长等严重问题,其根本原因是由于接收机测量体制引起的脉冲丢失问题,导致威胁信号源的截获概率降低。结合RWR/ESM测量体制,对时分制频段处理方法引起的脉冲丢失进行理论分析,推导出工程上可行的应用公式,在此基础上提出了一种基于脉冲密度分配系统资源的改进方法,并结合仿真结果对两种方法引起的脉冲丢失做了对比分析。研究结果为今后新型RWR/ESM的研制提供了理论参考。     

英国Griffin ESM/RWR系统

英国最近将生产一种新的EW设备——Griffin ESM/RWR系统.Griffin是面向软件的系统,它提供全自动威胁监视、识别和告警.该系统的关键部件是雷达防御系统有限公司研制的先进型SADIE处理机(带电源)和Filtronic公司的瞬时测频接收机.该处理机的处理能力超过一般RWR所需要的能力.该系统的整套设备包括4个250g重的螺旋天线,2个0.6kg重的宽开双信道接收机和1个1.4kg重的程序装入装置/数据记录仪.程序装入装置可在飞行中重新编程,数据记录仪可记录6h.可供选择的子系统有4.4kg重的双线显示器、1.2kg重的指示器(带1.0kg重的控制面板)和1553B数据总线接口.     

以色列自动干扰物发射系统──ACDS/Deseaver

以色列埃尔比特（Elbit）公司研制的自动干扰物发射系统ACDS（AutomaticCountermea－suresDispensingSystem）大约于1982年开始服役。该系统在局部微处理机控制下，一次齐射能发射24枚火箭弹。一般情况下，每个火控装置控制1座45管发射架或4～6座24管发射架。火控装置或由中心计算机（装有44千字节EPROM和12千字节RAM；有8个中断级）控制，或经火控装置前面板键盘进行手控（作备用）。自动方式时，导弹威胁由舰上作战指挥系统或舰上的ESM／RWR系统确定，中心计算机与舰上作战指挥系统或舰上的ESM／RWR系统的传输速度为每秒4800…     

多平台ESM协同信号处理系统的设计

根据未来电子对抗的发展趋势,对多平台电子支援措施（ESM）协同信号处理系统的结构、关键技术和功能展开具体的研究,分别介绍了ESM信号处理机、数据融合模块技术的设计,并以协同理论为依据,推导出分布式协同决策规则,从而实现了多平台ESM协同信号处理系统的结构以及功能设计。     

Salamandre法国模块化舰用ESM/ECM系统

“蝾螈"(Salamandre)是模块化的舰用ESM/ECM综合系统,频率覆盖E～J波段。该系统由1～3个外装的干扰发射机/相控阵天线装置、1个装桅的ESM阵列、1个操作人员显控台和2个装在舰内的设备机柜组成。 该系统有4种结构型式:“蝾螈"V1,仅有ESM设备,可装5000吨级舰艇;“蝾螈”V2,由ESM设备和1个干扰发射机/相控阵天线装置组成,可装3000吨级舰艇;“蝾螈"V3,由ESM设备和3个干扰发射机/相控阵天线装置组成,可装1500～5000吨级舰艇;“蝾螈”V(B),仅有干扰设备,可装5000吨级舰艇。     

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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NEXT GENERATION WIRELESS NETWORKS–ESPECIALLY THE USE OF MILLI-MICROWAVE BANDS

The global bandwidth shortage of wireless communications has motivated the exploration of the naillimeter wave （ram-wave） frequency spectrum for the next generation wireless communications. Recent advances in RF CMOS technology and high speed baseband signal processing technologies have enabled tile extensive research and development of turn-wave wireless communications. The multi gigabit per second data rate of ram-wave system will lead to applications in many important scenarios, such as WPAN, WLAN,back-haul for cellular system. And the frequency bands include 28 GHz, 38 GHz, 45GHz, 60GHz, E-BAND and even beyond 100 GHz. The propagation and the imitation of the RF circuits design in these frequency bands make the directional antennas be inevitable for mm-wave communications.