基于准同步采样法的电参数在线监测系统

详细介绍了基于准同步采样算法的电参数在线监测系统,阐述了系统工作原理、硬件组成以及软件实现.该系统实现了电压有效值、电流有效值、输出功率和功率因数等参数的在线监测和越限报警.系统硬件简单,成本低廉,操作界面友好、直观,有利于促进电力系统自动化的实现.     

交流电基本参量的同步采样检测技术及其实现

本文研究交流电参量的动态采样数字化测量的基本原理和技术实现。介绍了基于同步采样检测技术的电参量测量原理、硬件和软件设计。对智能电参量检测仪的模拟信号前端电路、六通道并行同步采样进行了分析,并提供了系统的软件流程图。该仪表可以对三相工频交流电进行多种参数的高性能检测,是用于发电检测和用电管理的理想工具。     

基于FPGA的高速采样系统实现

介绍一种应用于激光回波数据采集的两路双通道250MHz高速采样电路设计及基于FPGA的控制与数据处理的实现方法。阐述了采样系统的设计实现、硬件布局布线,并提出对IDDR加物理与时序约束条件和利用异步复位来同步采样数据接收使能信号的方法,从硬件和软件两方面保证采样数据的同步传输。仿真和实验结果表明,该高速采样系统的设计性能稳定,数据传输的同步性理想,设计达到了预期的效果。     

多路跟踪滤波同步数据采集系统的研究

介绍了采用高速硬件锁相环技术,对多路相关联信号同时、同步整周期均匀采样和抗混叠跟踪滤波的实现方法。给出了基于此方法由TMS320LF2407和AD73360L构成的多路数据采集与处理系统。提出一种不同结构的同步串行口接口电路的设计方法,给出了电路连接与软件流程。     

准同步采样技术及其DSP实现方法

介绍了准同步采样技术及其在基于DSP的电力测量模块中的应用.硬件上采用16bitAD转换器+32bit高速DSP处理器的架构;软件上以电网电压有效值的计算为例给出了准同步采样算法的实现方法.最后设计了一个实验方法:对样机输入三种不同频率、相同有效值的正弦信号,分别通过普通算法和准同步采样算法进行处理.比较实验结果可以证明,应用准同步采样技术可以很好地修正电网频率小幅漂移引入的同步误差.     

交流同步采样在断路器测控装置中的应用

真空断路器遥测装置中最重要的测量参数中最重要的是三相交流电参数,当电网频率波动时,必须采用交流同步采样技术才能保证采样计算精度,同步检测和FFT算法成为其核心技术,文章提出了如何使用硬件同步和软件同步相结合,以提高三相同步交流采样的精度和可靠性。     

分段插值同步算法在数字化变电站中的应用

提出一种分段插值同步算法来实现数字化变电站的过程层同步采样,以降低系统对硬件的要求,并提高系统的可靠性.针对插值同步算法进行了分段设计,根据数据的线性度情况分别采用一阶线性插值法或二次插值法;分析了各算法的最大采样值理论误差;提出了过程层采样插值同步的具体实现方法.最后通过现场插值同步精度试验验证了该算法具有较高的同步精度,符合IEC6044-8标准对0.2S级测量电子式互感器的要求.     

交直流数据采集系统的研制

介绍一个交直流数据采集系统。它采用参数自寻优同步采样法和双向过零鉴相技术,充分发挥了单片机在智能化仪器中的软件优势。给出的采样前置电路和其他硬件同样具有参考价值。     

ADSL在线测试系统的同步方法研究

在ADSL在线测试系统设计中，接收器的同步问题是设计的难点之一。本文论述了ADSL在线测试系统的三种同步技术（采样同步，帧同步和超帧同步），对同步算法进行了理论分析，并给出了基于FPGA硬件的同步实现方案。     

基于PLC的大气颗粒物同步采样装置控制系统的设计与实现

本文针对大气气相-颗粒相半挥发性/中等挥发性有机物的自动同步采集需求,设计并实现了一种基于PLC的大气颗粒物同步采样装置控制系统。该系统通过上位机触摸屏软件可以方便灵活地设置采样装置的自动采样方式,减少人工投入,有效提高采样效率。     

基于CPCI总线的嵌入式计算机通用接口设计

针对基于CPCI总线的嵌入式计算机设计中遇到的底层驱动软件与具体硬件芯片相互关联的问题,开展了嵌入式计算机通用接口设计的研究.采用软件、硬件与现场可编程技术相互结合的设计方法,通过通用硬件接1:1电路设计、共享存储区设计、通用函数设计,实现了基于CPCI总线的嵌入式计算机通用接口,并成功应用于具体的工程实践.     

A case history development of a foolproofing interfacedocumentation system

The authors discuss information transmission errors occurring between design engineers involved in software development and describe an interface design documentation system that can prevent them. The equivalence of human errors in software design and hardware manufacturing activities is established. The characteristics that must be included in an interface documentation system to prevent communication errors in software design activities, based on foolproofing principles that were identified for hardware manufacturing, are discussed. Utilizing these characteristics, an example of an interface documentation system for software products which control measuring equipment is presented. Its effects on the resultant number of communication errors between hardware and software engineers is subsequently experimentally evaluated     

A two-level cosimulation environment

Hardware/software codesign seeks to integrate system level, hardware, and software design. Ideally, we would like tools that allow rapid evaluation of design decisions and a full exploration of the design space. Available tools are often too slow and concentrate on the low level cosimulation of hardware and software parts, after the design has been partitioned. We are attempting to remedy these problems with Tosca (Tools for System Codesign Automation), a hardware/software codesign environment. Targeted at single chip implementations consisting of a CPU core cell and dedicated hardware, Tosca performs a high level cosimulation for what-if analyses before hardware/software cosynthesis. After cosynthesis, Tosca generates simulatable software to be run on a retargetable instruction level model of the CPU. The software and hardware bound parts are then cosimulated using a commercial VHDL simulator. The performance of the low level cosimulation strategy and the high level simulator is remarkable. Low level cosimulation performance is about that of dedicated CPU software emulators-7200 pseudo assembly instructions per second. High level cosimulation is three times faster than the low level cosimulation. Both simulators allow functional debugging by interfacing to a commercial waveform visualizer (Mentor Graphics SimView). Engineers have used Tosca to redesign a commercial link controller     

Codesign of embedded systems: status and trends

Ever increasing embedded system design complexity combined with a very tight time-to-market window has revolutionized the embedded-system design process. The concurrent design of hardware and software has displaced traditional sequential design. Further, hardware and software design now begins before the system architecture (or even the specification) is finalised. System architects, customers, and marketing departments develop requirement definitions and system specifications together. System architects define a system architecture consisting of cooperating system functions that form the basis of concurrent hardware and software design. Interface design requires the participation of both hardware and software developers. The next step integrates and tests hardware and software-this phase consists of many individual steps. Reusing components taken from previous designs or acquired from outside the design group is a main design goal to improve productivity and reduce design risk. It is argued that new methodologies and AD tools support an integrated hardware software codesign process     

Hardware/software trade-offs for bitmap graphics on the blit

The Blit is an experimental bitmap graphics terminal built for research into interactive computer graphics on the UNIX time-sharing system. The hardware is inexpensive and the graphics functions are implemented entirely in software. Nevertheless, the graphics performance of the Blit is comparable or superior to some displays with special-purpose graphics hardware. This paper explains the paradox by referring to some principles of design: the hardware and software should be designed together to complement each other; carefully designed software can outperform infelicitous hardware; and simplicity of design leads to efficiency of execution. These principles are illustrated by examples from the Blit hardware and software and comparisons with other systems.     

软硬件协同设计中模型表示与映射

目前的软硬件协同设计方法都有其局限性,主要表现在：缺乏必要的模型映射机制、不同语言描述的软硬件设计容易造成不一致现象。经过分析和研究,该文提出了一个软硬件协同设计流程,它基于CDM模型,支持从系统需求描述出发、通过设置各描述组件的参数,自动产生CDM模型。利用SystemC的软硬件描述功能,对CDM模型进行映射和绑定操作,自动生成SystemC可执行程序,使软硬件代码无缝联接。模型经过多次细化和验证,从而提高设计质量和缩短设计周期。最后通过一个实例说明该方法的设计特点。     

嵌入式系统虚拟开发环境的设计与实现

在嵌入式系统虚拟开发环境中为软件与硬件分别设计了ＥＳＤＬ语言和ＥＨＤＬ语言．ＥＳＤＬ是ＡＮＳＩＣ的超集,它为嵌入式编程增加了一些数据类型．ＥＨＤＬ是一种硬件描述语言．开发人员可以利用由嵌入式软件调度器和嵌入式硬件模拟器组成的协同验证环境调试嵌入式系统．利用这个虚拟的集成环境,软件开发人员可以在设计初期发现与硬件相关的错误,硬件开发人员可以获得系统功能的真实描述．硬件、软件的设计错误可以在系统制造之     

集成电路设计的系统级描述语言SystemC

人们提出了软件硬件协同设计的设计方法，以克服传统的将软件和硬件分开的设计方法对于SOC的设计存在的缺陷。SyStenlC是顺应这种发展趋势而产生的系统级描述语言。它是一种通过类对象扩展和基于C／C 的建模平台，支持系统级软硬件协同设计、仿真、验证、软硬件协同设计的系统级描述语言。本文介绍了系统级描述语言SySternC在集成电路设计中的应用，讨论了基于SyStemC的集成电路设计的设计流程、设计优势及其发展趋势。     

基于VSl003解码器的MP3播放器设计

以MSP430F149作为核心控制器,结合VSl003音频解码器,设计了一种带SD卡的MP3播放器,给出了MP3播放系统的软硬件设计。在硬件设计上,解码器与存储器分离,增加了存储容量;在软件设计上,使用条项菜单方式进行管理,可以方便地进行硬件或软件的升级。经过测试,该MP3播放器播放效果较好。     

基于LonWorks的温度监控系统设计

论述了基于Lonworks技术的温度智能节点硬件设计和软件设计,硬件设计阐述了节点结构及其工作原理;软件设计主要针对应用程序的设计.