基于FPGA的PCI接口数据采集系统设计研究

本文从研华公司在FPGA基础上的PCI接口数据采集系统设计经验入手,对基于FPGA的PCI接口数据采集系统的硬件和软件设计进行了详细分析,最后对相关设计进行了测试,希望为我国相关领域的发展起到促进作用.     

基于GPS授时的异地同步数据采集系统

基于GPS授时的异地同步数据采集系统用于异地的数据采集设备进行精确同步.系统硬件主要包括Motorola GPS接收机、ADLink PCI9820采集卡和Xilinx Sparten3E FPGA,软件使用VC6编程控制采集卡进行数据采集.该系统的原理是通过GPS的秒脉冲,使其在同一时刻触发采集卡进行数据采集.其中同步触发控制逻辑由FPGA实现.实验证实该系统的同步性能达到指标要求.     

基于PCI9054的数据采集回放系统设计

在介绍PCI9054的基础上,开发出基于PCI总线的高速数据采集回放卡。用PCI9054实现了33MHz、32位的PCI协议,构成一个PCI数据采集回放系统。介绍了系统的设备驱动程序。     

基于FPGA的数据采集与处理系统研究

FPGA由于集成了超大规模集成电路和可编程器件的诸多优点,其在现代工业生产和科学研究中的数据采集和处理的应用越来越广泛。本文针对SSI接口类传感器数据采集与数理需求,设计了以FPGA为核心处理器的多通道数据采集系统。所设计的系统通过PCI9054桥接芯片实现FPGA 局部总线到PMC/PCI总线的转换,而后再通过PMC/PCI总线完成数据采集系统与上层母板的连接和通讯。系统调试结果表明所设计的系统能够实现数据采集处理功能。     

基于DSP的PCI总线数据采集系统的研究

随着数字信号处理技术和计算机技术的不断发展,基于DSP的PCI总线数据采集系统将会得到越来越广泛的应用.以实际开发的系统为背景,详细论述了基于DSP的PCI总线结构的数据采集系统硬件及软件设计方案和实现方法.     

基于PCI总线的雷达视频高速数据采集接口设计

采用Altera公司的FPGA及其PCI接口芯片PCI9054实现了现代雷达视频的高速数据采集接口.在介绍PCI9054接口控制器的基础上给出一种通用的高速数据采集接口设计,并提出一种新的包括PCI9054存储器映射传输操作的设计.经测试证明,该接口的数据采集速率能稳定地达到200 Mb/s.     

基于VxWorks的雷达数据采集系统的设计与开发

雷达数据采集系统在中断响应、数据处理等方面对系统的实时性和可靠性要求较高，有必要选用高性能的实时操作系统作为开发平台，同时采用PCI总线来保证高速的数据传输。为此，给出了一种在实时操作系统VxWorks平台下基于PCI总线的实时雷达数据采集系统的设计方案，详细描述了在VxWorks实时操作系统下PCI设备驱动程序典型结构和工作过程，给出了PCI雷达数据采集卡驱动程序的开发过程和关键例程，以及如何采用驱动开发工具WinDriver提高开发效率。     

基于PCI总线的双通道数据采集系统

在要求大容量、实时性的高速数据采集中,采用PCI总线作为数据传输总线是高速数据采集的发展方向。为了采集两路模拟音频信号,提出了一种基于PCI总线的双通道数据采集系统的设计方案。首先介绍了系统的硬件组成及功能,并阐述了系统的工作原理,介绍了核心器件DSP的程序设计,以及驱动程序的设计方法;最后得出结论。本系统具有可传输数据容量大、速度怏、实时性好及成本低等特点。     

基于PCI8602的水声信号监测系统设计

为了提高水声信号监测效果和能力,设计了一种基于PCI8602数据采集卡和LabVIEW编程软件的靶标水声信号监测系统。系统采用RHSA20标准水听器为前端传感器,连接信号调理模块,以PCI8602数据采集卡为核心硬件,通过LabVIEW编程软件快速实现对水声信号的实时数据采集、显示与存储,可满足对水声信号的监测需求。     

基于视场合成的成像光谱仪数据采集系统设计

推扫式遥感仪器可以采用多个镜头进行视场合成以提高仪器的总视场.视场合成技术涉及光学、机械、电子学系统技术.电子学系统需要完成多镜头数据的采集、融合及其他处理.在光谱仪地面测试数据采集系统中,每个镜头对应一个独立的数据采集与处理模块.控制模块同步各子模块的数据采集,并通过FIFO接口获取各子模块数据,然后通过PCI数据采集卡发送到PC机中.所有模块插在一个底板中,底板完成模块间的连接.介绍了多镜头下数据采集系统的设计与实现.     

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