LTE-Advanced空口监测仪表系统设计

伴随着国际范围的3GPP LTE技术的商用化,新型无线网络分析和优化仪表日益得到重视和发展。针对我国在LTE网络建设过程中,缺乏空中接口监测仪表的问题,研发符合3GPP及行业标准要求的LTE-Advanced空口监测仪表的硬件平台是必需的。本文设计基于FPGA的空口监测仪表的硬件系统。结合系统设计,分析了LTE-Advanced空口监测仪表的数据处理流程。从物理架构和逻辑架构方面分别阐述射频和基带板卡、协议板板卡设计思路。最后,针对LTE-Advanced空口监测仪表的开发难度,本文对FPGA和DSP两种技术路线进行了分析比较。     

The influence of the Energy Performance Certificate: The Dutch case

All European Union Member States require an Energy Performance Certificate (EPC) when buildings are constructed, sold and rented. At its introduction the EPC was considered a pioneering instrument, one that would help overcome an information deficit hindering consumer interest in energy efficient dwellings. Now that the EPC has been implemented for several years it is possible to examine its impact. This research draws on data from ex-ante and ex-post assessments of the EPC in a number of countries and presents the results of a survey of Dutch private dwelling purchasers. This survey was based on two sample populations, one received an EPC during property transaction and another did not. Differences were sought between the two samples in a number of areas relating to the adoption of energy efficiency measures. Results show that many projections about the impact of the EPC have fallen short. The EPC was found to have a weak influence, especially pre-purchase. The potential of the EPC in driving energy efficiency improvement in the existing stock is doubted especially if it continues to act independent from a mix of instruments designed to tackle multiple barriers. It is argued that the energy saving potential of existing dwellings, applauded in climate change policy, will remain unexploited if it continues to be assessed subjectively by householders.     

相控阵超声检测系统特性评价的具体要求（一）

超声相控阵技术对缺陷的检出能力,对缺陷定位、定量、定性表征的准确性,相关于相控阵仪器和系统特性的综合功能。本文介绍ASMEBPVC（美国锅炉压力容器法规）最新版（2009增补）有关相控阵超声检测仪器和系统特性评价的具体要求,包括相控阵：（1）声柬轮廓的测定;（2）声柬变角范围的测定;（3）阵元激活性的测定;（4）聚焦能力的测定;（5）参数和数据显示的计算机控制;（6）探头楔块衰减和延迟补偿的评价：（7）仪器垂直线性和水平线性及动态范围的评价。期望为国内承压设备相控阵超声检测的有效应用和标准化,提供法定依据和有用借鉴。     

LED可见光的虚拟仪器通信系统

以LED为核心的可见光通信是通信领域极具发展潜力的重要方式.针对LED光通信系统的要求,采用基于AVR的嵌入式结构及虚拟仪器技术,设计了具有较小体积和较低成本的发射接收控制系统.系统采用虚拟仪器平台作为通信系统的发射源和接收端子,并采用电荷泵升压器件AAT3110驱动LED,结合低偏移电压精密放大器OPA2350实现P...     

基于构件和虚拟仪器的变频器测试系统的设计与实现

虚拟仪器主要是用软件来实现的各种仪器．其主要特点是灵活、多功能、一机多用及高性价比。介绍了一种基于构件和虚拟仪器变频器测试系统,该系统在逻辑上被划分为几个相对独立的部分,对各个部分分别进行构件化开发,从而降低了系统的开发难度,提高了系统的开发效率和可维护性。     

Development of virtual data acquisition systems based on multimedia internetworking

This paper proposes a novel approach centered on multimedia internetworking for the development of Distributed Virtual Instruments (DVI). Multimedia internetworking refers to network infrastructures, protocols, models, applications and techniques being currently deployed over the Internet to support multimedia applications, e.g., videoconferencing, video-on-demand, shared workspaces. It is applied to broaden the concept of virtual instrument and enable new measurement patterns leveraging efficiency and interactivity. A DVI is a virtual instrument split into possibly multiple and independent parts, sender and receiver, which are linked by real-time continuous media and control streams. Senders and receivers are built by using open, composable and modular components based on a time sensitive actor framework and glued by multimedia middleware. A prototype is described to demonstrate the potential and the benefits of the proposed approach.     

Policies to support renewable energies in the heat market

Whereas the contribution from renewable energies in the electrical power market is increasing rapidly, similar progress in the heat market is yet to be made. A prerequisite for progress is the development of innovative support instruments that transcend the usual support through public subsidies or tax reductions. We present an overview of the various classes of possible instruments. Some particularly interesting instruments will be selected and evaluated, comparing them qualitatively and quantitatively for the case of Germany. The most favourable model is found to be a new, allocation-financed¹ model known as the Bonus Model. This model will be described in more detail.     

计量自动化检测系统中存在的问题及对策

随着我国经济的快速发展,计量自动化检测系统在信息系统中的作用越来越重要。计量自动化检测系统主要以网络通信为载体,通过采用各种方式实现与计算机、工程现场计算终端机之间进行信息交流、数据交换的系统。它集合了计算机控制技术、现代数字技术以及软件测量计量技术、电力营销技术等各种技术,能够适时实现信息的采集与处理。其在信息通讯过程中的地位越来越重要,但是目前计量自动化检测系统在发展过程中也出现了很多问题。鉴于此,本文主要分析了计量自动化检测系统中存在的问题,并在此基础上,提出了针对性的对策。     

电子测量仪器的可靠性鉴定试验

本文主要描述如何进行电子测量仪器可靠性鉴定试验.     

智能仪表中的一种数据融合方法

智能仪表中，由于工业过程的各种干扰，严重地影响了测量精度，提出一种基于普遍采用的单传感器系统数据融合方法，通过对传感器测量数据的分批估计得到误差和主差均较小的融合结果，并以实验表明这种方法优于目前广泛应用的算术平均值方法。