异常环境下GNSS接收机性能测试平台开发

为了验证全球导航卫星系统(GNSS)接收机在电离层异常环境下的性能是否满足相应的技术规范要求,文章设计开发了GNSS接收机性能测试平台;该平台主要由信号仿真器、轨迹发生器、误差仿真模块、待测接收机以及性能测试模块组成,可以仿真不同电离层环境下的卫星信号,从而测定接收机在不同环境下的性能;详细介绍了误差仿真模块与测试模块的设计方案,并利用信号仿真器与接收机进行测试验证,证明了该平台的有效性。     

8XC196MC变频器专用仿真器的开发

介绍变频器专用仿真器的设计开发。硬件设计方面,介绍了芯片的选择,重点论述三对PWM波形发生器、保护电路和信号输入输出电路,并选择并口与上位机通信;软件设计方面,仿真器与上位机的通讯使用同步串行通讯（SPI）,软件依据此通讯协议而设计,使用32位命令－地址－数据方式。此仿真器也可直接用于变频控制,实际使用证明,此仿真器优于其它通用型仿真器。     

多通道GPS卫星信号仿真器设计与实现

立足于GPS卫星信号仿真技术,提出了基于DSP+FPGA的多通道GPS卫星信号仿真器硬件设计方案,概略介绍了硬件系统的基本架构,详细给出了基于此上的软件结构和程序流程,最后通过实验验证了该方案的可行性。实验结果表明,该方案设计的GPS仿真器信号逼真度高、可编程性强、使用灵活,并具有一定的动态性能,为GPS接收机的性能检测提供了有益的支持。     

飞机配电系统负载仿真器的研究与设计

为了能在实验室的条件下验证飞机配电系统的逻辑功能及其各项性能指标,对飞机配电系统负载仿真器的原理及实现进行了研究和设计;在飞机配电系统负载仿真器所包括的上位机和下位机的系统方案中,上位机用Labview编程并由RS-232与下位机通讯,下位机利用DSP和FPGA实现对SSPC模块和汇流条电压信号模块及负载的电流信号模块进行仿真;在与电气远程终端（Electrical Remote Terminal）和电气系统处理机（PSP）的联调测试中表明,此系统可以完成预定计划中飞机配电系统的地面实验的各项任务。     

北斗卫星信号多普勒频移的电路设计

接收机在接收卫星信号时,由于接收机与卫星的相对运动,导致卫星信号在传播过程中出现多普勒频移。为了实现卫星信号中载波多普勒的剥离,设计了一种基于北斗卫星信号的载波多普勒剥离电路。描述了载波多普勒产生的原因以及剥离的方法,并详细论述了该电路的设计方法。最后对该电路进行MATLAB和Modelsim仿真,验证了设计的载波多普勒剥离模块性能满足北斗卫星接收机的要求。     

基于DSP和FPGA的卫星信号模拟器设计与实现

为给卫星导航接收机的测试提供高稳定度、高精度、可复现的卫星信号,设计了一款卫星信号模拟器。该系统以DSP+FPGA作为核心芯片,并集成了射频上变频电路、高速D/A转换电路、Flash芯片和SDRAM芯片。系统可以实现GPS L1信号和BDS B1I、B2I、B3双模多频点卫星信号的模拟。利用商业接收机对硬件平台生成的卫星导航信号进行测试,定位结果验证了卫星信号模拟器设计的正确性,表明该系统达到了预期设计要求。     

GLONASS卫星信号模拟器导航电文生成

导航电文的生成是GLONASS卫星信号模拟器研制中的关键部分,获得正确的导航电文信息是接收机实现定位、测速以及授时等功能的前提条件。为了满足接收机测试的需要,GLO-NASS卫星信号模拟器输出信号必须调制正确的导航电文。GLONASS卫星信号模拟器由模拟器仿真软件和信号生成单元组成。主要研究GLONASS卫星信号模拟器的软件部分。在分析GLONASS卫星信号模拟器结构和导航电文结构的基础上,详细介绍了GLONASS卫星信号模拟器中导航电文的生成过程。重点对从R inex文件中读取星历参数并转化成二进制格式导航电文的程序实现进行了深入研究,利用GLONASS接收机对卫星信号模拟器输出的仿真信号进行电文解析和定位解算,试验结果可以验证卫星信号模拟器中导航电文生成的正确性。     

GLONASS卫星导航信号模拟与接收验证软件开发

GLONASS卫星导航信号的模拟可以为复杂环境下信号性能评估和接收机开发提供良好的研究基础。介绍了GLONASS信号的结构组成和仿真模型,分析了GLONASS信号生成过程中的伪距计算、多普勒频移、卫星位置计算三个关键问题,设计了一种基于C++平台的回放模式GLONASS信号软件模拟方案,实现了GLONASS中频信号文件的生成,并开发了GLONASS软件接收机进行了验证测试。结果表明,该软件接收机具有成本低和灵活度高等特点。     

北斗反射信号软件接收机的设计与实现

通过对GNSS(global navigation satellite system)反射信号软件接收机和硬件接收机进行对比分析,提出北斗反射信号软件接收机的结构及模块,包括接收直射和反射信号的天线、四通道射频前端、采样量化变换器和数据处理工作站。设计实现北斗导航卫星反射信号处理软件的实现方法及软件整体流程,给出捕获及跟踪两大主要模块的详细流程及处理方法。进行海面测高的岸基实验,通过与实际海面高度的对比验证了软件接收机系统的实用性。     

导航接收机上位机软件的设计与开发

本文以GPS导航接收机的研制为背景,在VC MFC AppWizard环境中针对上位机软件进行了详细的说明,其中包括上位机与下位机之间的数据通信、数据的实时显示、实时绘图、线程的使用、用户界面的设计等等.重点介绍了软件在开发过程中的要点和难点.其后,通过与下位机连接,运行GPS导航接收机程序验证了上位机软件开发的正确性、实用性、直观性.     

Only connect: teaching, technology and telesis

Abstract This paper describes an approach to the design of interactive multimedia materials being developed in a European Community project. The developmental process is seen as a dialogue between technologists and teachers. This dialogue is often problematic because of the differences in training, experience and culture between them. Conditions needed for fruitful dialogue are described and the generic model for learning design used in the project is explained.     

European Community policy and the market

Abstract This paper starts with some reflections on the policy considerations and priorities which are shaping European Commission (EC) research programmes. Then it attempts to position the current projects which seek to capitalise on information and communications technologies for learning in relation to these priorities and the apparent realities of the marketplace. It concludes that while there are grounds to be optimistic about the contribution EC programmes can make to the efficiency and standard of education and training, they are still too technology driven.     

一种自适应子融合集成多分类器方法

融合集成方法已经广泛应用在模式识别领域,然而一些基分类器实时性能稳定性较差,导致多分类器融合性能差,针对上述问题本文提出了一种新的基于多分类器的子融合集成分类器系统。该方法考虑在度量层融合层次之上通过对各类基多分类器进行动态选择,票数最多的类别作为融合系统中对特征向量识别的类别,构成一种新的自适应子融合集成分类器方法。实验表明,该方法比传统的分类器以及分类融合方法识别准确率明显更高,具有更好的鲁棒性。     

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.     

Avoiding semantic and temporal gaps in developing software intensive systems

Development of software intensive systems (systems) in practice involves a series of self-contained phases for the lifecycle of a system. Semantic and temporal gaps, which occur among phases and among developer disciplines within and across phases, hinder the ongoing development of a system because of the interdependencies among phases and among disciplines. Such gaps are magnified among systems that are developed at different times by different development teams, which may limit reuse of artifacts of systems development and interoperability among the systems. This article discusses such gaps and a systems development process for avoiding them.     

基于QTE的蒙古文显示机制研究与实现

蒙古语言是中国蒙古族使用的通用语言,由于蒙古文区别于其他文字的书写方式和其自身变形机制等特点,在很多通用的文字处理引擎中都不被支持。在嵌入式产品开发与应用领域中Linux加QTE已经成为流行方式。该文给出了一种在QTE环境上实现基于标准Unicode的蒙古文点阵显示和变形算法, 并自定义了支持蒙古文的QTE组件,扩展了QTE功能,为在Linux加QTE方式的嵌入式体系结构中处理蒙古文提供了一种解决方法。     

Designing economic np control charts: A programmed simulation approach

This paper presents control charts models and the necessary simulation software for the location of economic values of the control parameters. The simulation program is written in FORTRAN, requires only 10K of main storage, and can run on most mini and micro computers. Two models are presented - one describes the process when it is operating at full capacity and the other when the process is operating under capacity. The models allow the product quality to deteriorate to a further level before an existing out-of-control state is detected, and they can also be used in situations where no prior knowledge exists of the out-of-control causes and the resulting proportion defectives.     

基于AD9626的模拟信号采集存储卡设计

自然界的绝大部分信号都是以模拟的形式存在,因此模拟信号的采集转换存储在数字时代十分关键。文章讨论了在雷达信号处理领域基于AD9626的AD采集存储卡的设计原理、硬件结构和程序设计与芯片配置等问题,为今后相关领域的研究提供了可参考的方案。     

The development of robot art

Going through a few examples of robot artists who are recognized worldwide, we try to analyze the deepest meaning of what is called “robot art” and the related art field definition. We also try to highlight its well-marked borders, such as kinetic sculptures, kinetic art, cyber art, and cyberpunk. A brief excursion into the importance of the context, the message, and its semiotics is also provided, case by case, together with a few hints on the history of this discipline in the light of an artistic perspective. Therefore, the aim of this article is to try to summarize the main characteristics that might classify robot art as a unique and innovative discipline, and to track down some of the principles by which a robotic artifact can or cannot be considered an art piece in terms of social, cultural, and strictly artistic interest. This work was presented in part at the 13th International Symposium on Artificial Life and Robotics, Oita, Japan, January 31–February 2, 2008     

A human-computer interface for non-computer specialists

The COM teleconferencing system was designed to be easy to use for both beginners and people with much computer experience. A number of design choices in organizing the human-computer interface were considered very carefully. These design problems are not unique for teleconferencing applications, but will appear in many other developments of human-computer interfaces for non-computer specialists. This report discusses naming conventions, menu format, user commands, help facility and the treatment of ‘type ahead’ from the users.