国产芯片自动测试系统射频测试模块设计

针对当前射频芯片性能不断增强和应用日益广泛的现状,同时为了满足5G射频芯片测试需求,结合当前国际先进芯片自动测试技术,重点对国产芯片自动测试系统射频测试模块开展设计。通过对当前市场常用射频芯片以及5G射频芯片测试需求研究,通过采用小型化设计优化矢量信号收发模块的性能;为解决测试频率不断升高带来的问题,设计中采用模块化变频设计来拓展芯片测试频率范围;同时设计4个射频信号通道,每个通道具有4个射频端口,最大能够对16个被测件进行测试,显著提高芯片测试效率。该系统能够完成50M-12GHz矢量信号发射和分析,同时具有噪声系数测试,S参数测量,双音信号生成等功能。     

基于PCI总线的计算机组件自动测试系统设计

针对某型计算机信息处理板性能自动化测试要求，对其各种性能参数的自动化测试方法进行了深入研究，并利用LabVIEW虚拟仪器开发平台和仪器总线技术，建立了基于工业控制计算机和数据采集卡的开放式自动测试系统；该系统充分利用了信息处理板DSP芯片的强大运算能力，确保系统具有很快的测试速度和很高的测试精度；自动测试系统的成功应用，大大提高了对信息处理板的测试水平。     

基于DSP和VXI-11协议的LXI仪器控制与实现

为实现嵌入式系统对LXI仪器的远程控制,采用DSP芯片扩展DP83848C以太网接口芯片的硬件方案和基于简化TCP/IP协议及RPC协议支持的软件方案,在分析TCP连接过程、RPC调用流程和VXI-11协议工作过程的基础上,设计实现了支持VXI-11协议的嵌入式硬件平台和控制软件;以RS SMB100A微波信号源为被控对象的实验测试及数据分析结果表明,文中的硬件平台和控制软件可以根据协议工作时序正确发送控制数据包,LXI仪器可以正确响应嵌入式端的远程控制命令;文章提出的基于DSP和VXI-11协议的LXI仪器控制方案即可以用于实现分布式、低成本、灵活性较高的自动测试系统,也可以用于LXI仪器控制的桥接方案设计。     

基于VC++环境下射频通道自动测试系统的实现

复杂射频通道由大量的有源、无源微波器件构成,在调试和应用过程中需反复开展大量的测试工作.论文基于Visual C++6.0编译环境,利用GPIB和LAN构建了自动测试系统,在完成对仪器参数远程控制的基础上,实现了数据采集、实时显示与数据处理等功能,满足射频通道典型参数的测试要求,简化了测试流程,提高了测试效率.     

广晟微电子选用LTXCX实现TD射频芯片数字化测试方案

近日,广晟微电子有限公司（RME）携手LTXCrederlce有限公司在LTXC的X系列自动测试平台上成功地将新一代TD-SCDMA数字射频收发芯片RS2012投入量产。此测试方案是世界上首款TDSCDMA数字射频芯片测试方案,也是对TD—SCDMA芯片产品量产测试领域的一个历史性的飞跃。     

基于PCI9056的PCI一驱多卡驱动开发

射频频谱分析仪作为一种通用测试仪器,可用于通信系统或终端的测试与维护。小型化、标准化与模块化的特点,使其在快速组建多功能、智能化、低成本的自动测试系统中得到广泛应用。PXI总线接口是射频频谱分析仪的重要组成部分,也是其设计的重难点之一。本课题采用了PCI9056加可编程逻辑器件的方法,来完成PXI总线的数据传输以及PXI总线的触发功能。本项目中PCI9056工作在C模式,并利用DMA进行了频谱数据采取、控制命令下发以及对FPGA芯片的程序的动态配置。详细介绍了9056的驱动层工作。     

基于FPGA的IEEE488接口协议实现及驱动程序开发

IEEE488作为一种通用的并行总线,凭借其低延时、可靠传输等优势,广泛应用于仪器控制与测试系统中;目前,符合IEEE488接口协议的专用GPIB芯片如NAT9914、uPD7210、MC68488等都已停产,在售GPIB控制器产品类型少且价格十分昂贵,难以满足国内市场需求;因此提出了一种基于FPGA技术来实现IEEE488接口协议的方案,以典型的GPIB接口芯片NAT9914为蓝本,使用Verilog语言描述GPIB接口功能,调用VISA虚拟仪器函数库开发驱动程序与设备通信,组建完整的自动测试系统,并通过SCPI指令对仪器进行程控、数据采集等操作;经测试,产品性能稳定,能满足实际应用需求,且成本较低,有一定的市场价值。     

一种新型加速度传感器性能测试系统

介绍了一种新型的加速度传感器性能测试系统,它由计算机分析平台、数据采集子系统、数据交换子系统和直流调速子系统四个部分组成。系统通过串口控制直流调速系统改变转盘的速度从而获得变化的加速度曲线,再通过射频芯片nRF2401进行相应的数据采集。上位机采用LabVIEW开发,其他3个子系统采用PIC单片机作为主控芯片实现。     

月面探测器实时能量平衡分析及自动测试系统

近年来,世界各国将目光聚焦于月球探测上,然而目前探测器缺乏一套统一的自动测试系统.针对月面探测器工作模式多、环境因素复杂等特点,提出月面探测器实时能量平衡分析及自动测试系统.根据大光照角试验、宽温度蓄电池组容量测试及全任务周期负载需求评估等数据,实现月面探测器能量平衡分析.通过控制计算机及GPIB接口输入测试仪器,实现具有自动数据采集、数据记录、图表显示和故障预警功能的自动测试系统.该系统填补了探测器模拟测试相应领域的空白,可以为后续月面探测器的地面模拟测试提供一定的建议与参考.     

基于VEE的电子测量自动化的应用

针对现在手动测试的局限性,介绍了利用测试技术搭建测试平台,实现对测试仪器的自动控制和数据采集。该自动测试系统是基于Agilent VEE软件平台和GPIB接口的应用实例,实现了对高精度时间间隔计数器SR620的初始化、测量模式选择、存储位置的选择及文件的命名、采数间隔控制、两路时频信号时差的数据采集和自动存储等。通过试验表明,该自动测试运行正常,已成功应用于时频信号的环境试验中。     

煤矿井下安全监控分站的设计及其仿真实现

为了设计一种具有低成本、低功耗、易操作、功能强且可靠性高的煤矿井下安全分站,针对煤矿安全生产实际,文章提出了采用MCS-51系列单片机为核心、具有CAN总线通信接口的煤矿井下安全监控分站的设计方案;首先给出煤矿井下安全监控分站的整体构架设计,然后着重阐述模拟量输入信号处理系统的设计过程,最后说明单片机最小系统及其键盘、显示、报警、通信等各个组成部分的设计;为验证设计方案的可行性与有效性,使用Proteus软件对设计内容进行仿真验证,设计的煤矿井下安全监控分站具有瓦斯、温度等模拟量参数超标报警功能和电机开停、风门开闭等开关量指示功能;仿真结果表明:设计的煤矿井下安全监控分站具有一定的实际应用价值.     

Call for Papers The 6^th International Conference on Grid and Cooperative Computing

Recent years have seen rapid advances in various grid-related technologies, middleware, and applications. The GCC conference has become one of the largest scientific events worldwide in grid and cooperative computing. The 6th international conference on grid and cooperative computing (GCC2007) Sponsored by China Computer Federation (CCF),Institute of Computing Technology, Chinese Academy of Sciences (ICT) and Xinjiang University ,and in Cooperation with IEEE Computer Soceity ,is to be held from August 16 to 18, 2007 in Urumchi, Xinjiang, China.     

View-based model-driven architecture for enhancing maintainability of data access services

In modern service-oriented architectures, database access is done by a special type of services, the so-called data access services (DAS). Though, particularly in data-intensive applications, using and developing DAS are very common today, the link between the DAS and their implementation, e.g. a layer of data access objects (DAOs) encapsulating the database queries, still is not sufficiently elaborated, yet. As a result, as the number of DAS grows, finding the desired DAS for reuse and/or associated documentation can become an impossible task. In this paper we focus on bridging this gap between the DAS and their implementation by presenting a view-based, model-driven data access architecture (VMDA) managing models of the DAS, DAOs and database queries in a queryable manner. Our models support tailored views of different stakeholders and are scalable with all types of DAS implementations. In this paper we show that our view-based and model driven architecture approach can enhance software development productivity and maintainability by improving DAS documentation. Moreover, our VMDA opens a wide range of applications such as evaluating DAS usage for DAS performance optimization. Furthermore, we provide tool support and illustrate the applicability of our VMDA in a large-scale case study. Finally, we quantitatively prove that our approach performs with acceptable response times.     

A pragmatic multi-method investigation of discrepant technological events: Coping,attributions, and ‘accidental’ learning

Discrepant technological events or situations that entail a problem, a misunderstanding or a difficulty with the Information Technology (IT) being employed, are common in the workplace, and can lead to frustration and avoidance behaviors. Little is known, however, about how individuals cope with these events. This paper examines these events by using a multi-method pragmatic approach informed by coping theory. The results of two studies – a critical incident study and an experiment – serve to build and test, respectively, a theoretical model that posits that individuals use a variety of strategies when dealing with these events: they experience negative emotions, make external attributions, and adopt engagement coping strategies directed at solving the event, eventually switching to a disengagement coping strategy when they feel they have no control over the situation. Furthermore, users’ efforts may result in ‘accidental’ learning as they try to overcome the discrepant IT events through engagement coping. The paper ends with a discussion of the results in light of existing literature, future opportunities for research, and implications for practice.     

The Distributed Time-Triggered Simulation Scheme: Core Principles and Supporting Execution Engine

Distributed real-time simulation is a young technology field but its practice is under increasing demands. In recent years the author and his collaborators have been establishing a new approach called the distributed time-triggered simulation (DTS) scheme which is conceptually simple and easy to use but widely applicable. The concept was initiated in the course of developing a new-generation object-oriented real-time programming scheme called the time-triggered message-triggered object (TMO) programming scheme. Some fundamental issues inherent in distributed real-time simulation that were learned during recent experimental studies are discussed along with some approaches for resolving the issues. An execution engine developed to support both the TMOs engaged in control computation and the TMOs engaged in DTS is also discussed along with its possible extensions that will enable significantly larger-scale DTSs.     

Software-Konfigurationsmanagement in großen Softwareprojekten

Zusammenfassung Mit zunehmender Größe der Softwaresysteme verschärfen sich die für die Software-Herstellung typischen Probleme: Beherrschen großer Objektmengen, Erhalten der Systemkonsistenz, Kontrolle der ständigen Änderungseinflüsse und Gewährleisten einer langen Lebensdauer. Die Disziplin Konfigurationsmanagement bildet den methodischen Ansatz, diese Probleme besser zu beherrschen. Software-Konfigurationsmanagement faßt die Herstellung von Softwaresystemen als eine Abfolge von kontrollierten Änderungen an gesicherten Zwischen- und Endergebnissen auf. Dargestellt werden die Objekte und Funktionen des Software-Konfigurationsmanagements sowie die hierfür in großen Software-Projekten benötigten Methoden, Instanzen und Hilfsmittel.     

Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and     

Editorial:Brain-machine interface(BMI) and cyborg intelligence

正Brain-machine interfaces(BMIs)aim at building a direct communication pathway between the brain and an external device,and represent an area of research where significant progress has been made during the past decade.Based on BMIs,mind information can be read out by neural signals to control     

Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and overseas to the world’s scientific circles,especially to stimulate     

SCIENCE CHINA Information Sciences SUBJECT INDEX TO VOLUME 57(2014)

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