基于FPGA的高速数据传输系统设计与实现

为了满足国家重点专项“量子科学实验卫星”中“量子存储板”高速串行数据传输的测试要求,提出了一种以Nios II嵌入式处理器为控制核心,TLK2711、RS422、USB2.0和千兆以太网为传输接口的高速数据传输解决方案;系统采用TLK2711完成高速数据的串并转换,采用RS422完成命令和控制信号的传输,实现与“量子存储板”的高速数据传输;利用Xilinx公司Zynq-7000芯片独有的ARM+FPGA架构实现千兆以太网完成数据的高速传输,利用EXAR公司XR21V1414 USB转串口芯片实现命令、遥测等数据的传输;采用Labview编写上位机控制整个系统的运行,实现命令发送、指令解析、运行状态显示、数据帧产生、高速数据传输、解析和存储等功能;实测结果表明,此系统数据传输速率高达600 Mbps,满足高速串行数据传输的要求,且具有稳定性高、可靠性好等优点。     

SRIO的高速数据传输系统解决方案

为了解决高速图像信息采集端与存储端在远距离传输过程中速率低、可靠性差的问题,提出了基于SRIO的高速数据传输系统解决方案.该系统包括1553B命令接收接口、SRIO数据接收接口、LVDS数据回读接口与存储器数据交换接口.配合单元测试台和存储器,通过上位机软件对LVDS接口回读的数据进行解包分析,以检验接收到的SRIO数...     

新一代遥测网络系统及其传输组网方式研究分析

对新一代遥测网络系统(TmNS)进行了研究,对系统的组成框架结构进行了分析;新的遥测网络系统通过新增加远程、宽带数据链路部分,使得遥测网络系统具备了下行遥测传输能力,系统因此可以进行双向数据传输,而遥测网络数据的传输与控制需要在一定的约定规则下进行,对遥测网络系统的控制欲联网协议进行了分析研究,提出了关键的几项用于新一代遥测网络系统的控制与联网协议,为飞行试验遥测网络系统中试飞数据传输提供统一规则.     

遥测数字视频信号高速采集存储系统的设计与应用

介绍了遥测数字视频信号的高速采集与实时存储,主要阐述了系统整体设计、存储器硬件设计、FPGA逻辑时序设计以及系统自检测试;其中硬件设计包括数据解码、Flash硬件设计以及LVDS调度模块,时序设计包括视频信号采集模块时序和Flash读写擦控制时序;本设计由FPGA来控制视频信号的高速采集和图像数据的高速串化与解串,通过LVDS接口传输方式进行Flash存储,再将存储模块中的数据读出,发送至地面综合测试台进行解包分析,完成自检功能。其中输入数据码流为31MB/s,供电电压28V左右,帧率为100帧/秒;本设计具有高码流、存储容量高的特点,大大提高了遥测系统的可靠度,已经在项目中得到应用。     

基于Socket的远程监控的通信系统实现

随着计算机和通信技术的迅速发展,通过移动通信技术进行数据和命令传输的远程监控系统是当今研究的热点之一.应用已有的移动通信技术与Internet服务,通过心跳包和控制命令的方式实现了在监控中心和远程终端之间的双向数据传输.通过实际的应用,该系统能很好地满足远程监控系统的数据传输的需求.     

双波段遥测天线设计

随着航空飞行试验数据量的不断增加,原有IRIG106遥测系统已不能完全适应当前和未来的需求;同时随着网络技术的不断发展,遥测系统的网络化成为新的发展趋势;民用4G通信占用S波段遥测资源使得航空遥测寻找新的传输频段;为了充分利用和保护现有资源,并适应遥测的网络化发展,提出在现有S波段遥测基础上增加C波段网络数据传输功能,开展双波段遥测天线设计技术研究;在对天线结构进行合理设计的基础上,提出了一体化馈源设计方案;通过S波段振子与C波段振子的集成化设计,实现了C波段无线网数据与S波段串行数据流的共同传输,极大地提高了遥测数据传输速率,缓解了遥测频率资源紧张的现状;通过飞行试验验证,设计的双波段天线能够满足飞行试验大速率数据的传输需求。     

基于嵌入式系统的钢轨温度采集系统

本文以嵌入式系统为控制核心,采用DS18820温度传感器进行钢轨温度多点采集,并使用GPRS通信模块与远程主机间的数据传输.该系统采用linux作为嵌入式操作系统,一方面利用多线程串口编程实现对DS18820的操作.进行实时温度采集;另一方面发给GPRS模块AT命令来控制温度数据向远程主机的发送与接收.远程主机将收到的数据进行汇总并以图表的形式表现出来.     

IIC总线和LVDS在高速数据传输接口电路中的应用研究

当前在高速数据系统中,LVDS接口已被广泛应用,为实现同系列设备之间的智能识别、自动握手以及LVDS高速数据链路通信质量的检测,利用FPGA的IO电路结构,设计一种模拟IIC总线协议电路,该IIC总线高效地实现设备之间的信息双向传递;同时利用FPGA内部丰富寄存器资源设计PRBS码型电路来检测LVDS接口芯片电路误码率;实际测试表明该多通道LVDS传输方式在2米长电缆连接能够实现数据的稳定、低误码率传输,并且在时钟频率为100 MHz时,数据传输速率高达4.68 Gb/s。     

某飞行器双绞线数据传输系统的设计与实现

针对飞行器内部设备间对远距离通信的需求以及通信电缆由多级低频连接器相连的特点,设计了一种基于LVDS技术的双绞线数据传输系统。分析了阻抗不连续系统存在的隐患,对不同频率和传输距离下的LVDS信号的传输衰减做了对比研究,并对高频LVDS信号长距离传输使用均衡器做了相关测试与理论计算。最终验证了传输方案的可行性,确保了176.947 2 Mb/s波特率的数据流能可靠地传输104 m。     

以太网的列车通信网络主控设备性能监控

针对列车通信网络(TCN)中的主控设备,设计开发了一套网络监控系统。系统基于以太网方式实现上位机与主控设备的通信连接,采用多线程技术、优先级和时间片轮转调度相结合的多任务技术、看门狗定时机制以及数据缓冲队列等手段实现了控制命令的快速响应和多组监控数据的实时并行传输与处理。重点研究了上位机与主控设备的数据传输与处理方式、多线程和多任务间的逻辑控制与调度,以及提高系统实时性和可靠性的问题。     

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。     

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.     

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.     

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     

Explanation and prediction: an architecture for default and abductive reasoning

Although there are many arguments that logic is an appropriate tool for artificial intelligence, there has been a perceived problem with the monotonicity of classical logic. This paper elaborates on the idea that reasoning should be viewed as theory formation where logic tells us the consequences of our assumptions. The two activities of predicting what is expected to be true and explaining observations are considered in a simple theory formation framework. Properties of each activity are discussed, along with a number of proposals as to what should be predicted or accepted as reasonable explanations. An architecture is proposed to combine explanation and prediction into one coherent framework. Algorithms used to implement the system as well as examples from a running implementation are given.     

Three Process Perspectives: Organizations, Teams, and People

This paper provides the author's personal views and perspectives on software process improvement. Starting with his first work on technology assessment in IBM over 20 years ago, Watts Humphrey describes the process improvement work he has been directly involved in. This includes the development of the early process assessment methods, the original design of the CMM, and the introduction of the Personal Software Process (PSP)^SM and Team Software Process (TSP){^SM}. In addition to describing the original motivation for this work, the author also reviews many of the problems he and his associates encountered and why they solved them the way they did. He also comments on the outstanding issues and likely directions for future work. Finally, this work has built on the experiences and contributions of many people. Mr. Humphrey only describes work that he was personally involved in and he names many of the key contributors. However, so many people have been involved in this work that a full list of the important participants would be impractical.     

基于复小波噪声方差显著修正的SAR图像去噪

提出了一种基于复小波域统计建模与噪声方差估计显著性修正相结合的合成孔径雷达(Synthetic Aperture Radar,SAR)图像斑点噪声滤波方法。该方法首先通过对数变换将乘性噪声模型转化为加性噪声模型,然后对变换后的图像进行双树复小波变换(Dualtree Complex Wavelet Transform,DCWT),并对复数小波系数的统计分布进行建模。在此先验分布的基础上,通过运用贝叶斯估计方法从含噪系数中恢复原始系数,达到滤除噪声的目的。实验结果表明该方法在去除噪声的同时保留了图像的细节信息,取得了很好的降噪效果。     

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。