多通道VPX总线固态数据记录回放系统

为满足数字阵列雷达回波数据的实时记录和回放需求,设计并实现了一种多通道VPX总线固态数据记录回放系统。该系统基于ARM-FPGA架构和大容量NAND Flash芯片阵列进行设计,存储容量大,可靠性高,系统设计总记录容量为1.5 TB,总数据记录速率高达640 MB/s,可同时完成4通道光纤数据的实时记录或回放。     

基于FPGA的雷达中/视频数据采集与回放系统设计

设计了一种基于FPGA的雷达中/视频数据采集与回放系统。系统以FPGA为数据采集和传输控制的芯片,通过USB 2.0接口实现与计算机的通信,并运用虚拟技术,采用Visual C＋＋语言设计系统的计算机实时显示界面。设计中运用硬件描述语言对FPGA进行编程,在完成对输入信号的采集和记录的同时,实现了对输入信号的防抖动、过零检测、等精度测频及电压最值、峰峰值和平均值的测量。该系统被封装于一个小型的屏蔽盒内,非常便于携带,可方便应用于外场雷达的数据采集。     

基于冗余存储的车载数据记录仪设计

针对传统车载数据记录仪缺少视频数据记录功能,不能实时回放视频数据,存储的数据容易丢失等问题,设计了一种基于冗余存储的车载数据记录仪。采用TMS320DM8168为主要视频处理芯片,实现记录仪的视频数据记录与回放功能;采用数据库管理两个固态硬盘,实现记录仪的冗余存储功能。结合连续工作72 h、高低温贮存实验结果,表明该记录仪运行稳定,视频记录与回放功能实用性强,数据存储的可靠性高。     

新型船用雷达分显器设计

为了适应不同舰船雷达分显示功能需求,提出并设计了一款新型船用雷达分显示器。该设备基于COM EXPRESS计算机模块和可编程逻辑器件进行设计。不仅可以用作原始雷达回波信号处理和显示,还具备目标标识、记录回放等辅助交互功能,同时留有多种视频和数据扩展接口。采用标准化、集成化的设计方式,使得该设备在性能和功能上具有很强的灵活性和扩展性。     

基于FPGA的多通道雷达数据回放系统设计

为解决雷达实时信号处理功能及性能有效验证问题,文中设计并实现了一种宽窄带一体化、多通道雷达数据回放系统。该系统按雷达工作的时序和数据率将雷达回波数据发送至实时信号处理系统,从而对目标跟踪场景进行复现,实现雷达实时信号处理功能及性能的有效验证。系统硬件平台由磁盘阵列服务器与两块PCIe光纤板组成。基于Xilinx系列产品,结合系统特点对PCIe DMA控制流程及响应机制做进一步调整,实现了服务器到光纤板的雷达回波数据高速批量传输。根据雷达工作机制及回波数据结构,设计FPGA回放控制状态机及相关功能模块,严格按照雷达工作的时序和数据率使雷达回波数据由光纤板传输至实时处理系统。分别设计软件同步控制方法和硬件同步控制方法,保证多板卡数据回放的同步性。测试结果表明,该系统实现了宽、窄带雷达回波数据的板间同步回放,各数据类型分别支持6路并行数据通道,数据回放峰值速率可达1 920 MB·s^-1。文中系统可依托雷达原有硬件平台实现,无需增设板卡和线缆,具有良好的集成性与通用性,目前已被应用于某多功能相控阵雷达中。     

一种基于PCIE总线的改进分散集聚DMA的设计

随着雷达数据记录回放系统对数据传输速率的要求越来越高,提出了一种基于外设部件高速互连标准(PCIE)总线的多通道分散集聚DMA的改进方法。针对现有分散集聚DMA获取、更新描述符需要DMA控制器与驱动频繁握手的不足,提出了一种通过集中传输DMA描述符链表给FPGA的方法,基于该方法设计了一种改进的DMA控制器,实现了雷达数据的连续传输,并能够与雷达信号处理系统配合,实现雷达数据的流水传输与处理。该设计具有良好的稳定性,实际测试的数据传输速率最高能达到1500 MB/s,能够满足雷达数据的高速传输。     

基于PMC规范的高速数据传输板设计

提出了一种基于PMC规范的高速数据传输板的硬件设计方案以及DMA方式数据传输的实现机制.高性能的硬件体系结构结合高效率的DMA实现机制,使得本设计具备很强的数据吞吐能力,有效地解决了雷达信号记录系统与回放系统之间大批量数据的实时传输问题.     

基于导航雷达记录回放仪接口板的设计与实现

基于记录回放仪项目,此项目采用的采集卡仅具备两个模拟输入通道,无法对雷达视频信号及多个标志位信号进行同步采集,由此设计了接口板,提出单通道采集多路信号的记录回放仪设计方案与实现方法,解决了记录回放仪中单个采集卡对多路信号采集的问题。文中设计的接口板适用于多种型号导航雷达,核心固化,易于升级,可扩展性好,成本低廉。     

高速雷达数据回放系统的实现

随着航空、雷达、声纳、遥感卫星图像传输等领域实时数据采集量的不断增加，以及实时数据处理系统能力的不断提升，对记录和回放系统的数据传输速率提出了更高的要求。现提出了一种高速雷达数据回放系统的实现方案。采用高性能的磁盘阵列和I／O控制载板，同时结合定制化设计的零延时换序PMC卡，使得单通道数据回放速率可以达到512Mb／s，满足了系统的设计指标。     

基于FPGA的视频数据解析及回放技术

本文给出了一种远程视频会议系统节点设备的视频数据捕获及回放的FPGA实现。本地捕获数据在进行压缩之前,需要对每一帧中色度信号U、V、亮度信号Y以及同步信号进行分离。通过DSP EM IF接口与FPGA之间的通信,实现了捕获和回放的单片FPGA设计,给出了基于FPGA的视频数据解析方法,同时也给出了DSP EM IF控制器和SDRAM控制器的FPGA实现。工程实践表明,本文的设计减少了DSP中算法软件的复杂度,提高了节点设备处理的速度,且稳定可靠。     

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.     

A rigorous proof of MIMO channel capacity’s increase with antenna number

It is well known that adding more antennas at the transmitter or at the receiver may offer larger channel capacity in the multiple-input multiple-output（MIMO） communication systems. In this letter, a simple proof is presented for the fact that the channel capacity increases with an increase in the number of receiving antennas. The proof is based on the famous capacity formula of Foschini and Gans with matrix theory.     

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