基于STM32单片机的北斗/GPS双模定位系统设计及测试

本文采用高性能STM32单片机作为控制系统,通过北斗/GPS双模定位模块及有源天线采集定位数据,并用上位机显示PVT信息,最终实现了成本低、延展性强、可广泛应用的双模定位系统。通过外场测试验证发现,该系统的定位精度较高,具有较强的实用性。     

基于BDS/GPS和百度地图的现代有轨电车监控系统的设计

为实现对现代有轨电车车辆的位置及运行状态进行实时监控,设计了一个基于BDS/GPS和百度地图的现代有轨电车监控系统;定位终端以具有我国自主知识产权的BDS/GPS双模定位模块为主,RFID系统作为辅助定位手段;数据通过HTTP的GET方法提交至服务器,由服务器端的PHP页面自动处理后存储到MySQL数据库,中心管理平台显示页面调用百度地图API,将数据显示在百度地图上;最终该系统可以实时获取并存储列车的位置坐标、速度、时间等信息,并在百度地图上以点、线和图表的形式显示出车辆的坐标和运行轨迹等;测试结果表明,该系统运行稳定,定位精度高,获取数据准确、时延小,能够满足应用需求。     

GPS/GLONASS 组合定位在LBS 系统中的应用

研究了GPS和GLONASS之间坐标系统和时间系统的转换关系,结合单系统伪距定位观测方程,推导出组合定位下的伪距观测方程及其求解方法,并编程实现。实验分析表明,GPS/GLONASS组合定位在观测条件不好的情况下,定位精度明显优于单定位系统。应用于LBS系统,将提高LBS的服务质量,推动LBS的发展。     

基于BD/GPS的双模船载导航系统设计

介绍一种基于BD/GPS的双模船载导航系统设计方案.选用双串口单片机作为北斗/GPS导航接收终端信息处理核心,串口通信实现电子海图系统中定位显示.实现了以TD3017A为核心的导航接收模块硬件系统设计,并给出软件设计流程图和单片机串口通信实现部分程序.对于研究北斗二带接收机及普及北斗系统在船舶领域的民用化有一定意义.     

北斗/GPS双模卫星授时/无源定位一体化处理模块的设计与实现

本文首先介绍"北斗一号"卫星定位系统工作原理,着重阐述了无源定位及授时的实现,并提出了对BD1+GPS无源联合授时方案,然后在上述理论基础上设计实现了北斗/GPS双模卫星授时/无源定位一体化处理模块,并对其基本特性和性能指标进行了描述。     

Android平台基于LBS的即时通信系统设计

针对android系统,本文介绍了一种基于LBS即时通信系统的解决方案。该系统基于XMPP协议(可扩展通讯和表示协议)构建通信子模块,通过android手机自带的GPS定位系统进行用户定位,从而实现位置感知子模块,最后结合Google Map实现地图显示。系统采用分层化瘀模块化设计,具有良好的可扩展性。     

双模高灵敏度辅助卫星导航关键技术

基于定位技术(LBS)业务的增长,使得高灵敏度卫星导航技术逐渐成为热点.分析了辅助卫星导航(Assisted-GNSS)技术,提出了辅助导航定位的解决方案,介绍了Galileo/GPS双模高灵敏度接收机设计的一些关键技术.     

基于STM32的防遗落智能书包设计

笔者设计了一款基于STM32F103RET6的防遗落智能书包系统,该系统由核心控制模块、稳压模块、语音识别模块、语音播报模块、RFID读写模块、GPS北斗双定位模块、WiFi模块、GSM通信模块、稳压模块以及手机APP等组成。RFID读写模块读入数据,装包时检测并播报未遗落或遗落的东西;WiFi模块联网获取并播报本地城市的天气情况;通信模块将信息发送到手机APP上;GPS北斗双定位模块和通信模块配合将书包的位置情况发送到手机APP上。测试结果表明,该系统实现了预期的设计功能。     

基于云服务器与Arduino的GPS定位系统设计

设计了基于Arduino的GPS定位系统,该系统以Arduino作为主控制器,结合实现定位功能的GPS模块和数据传送的GSM模块,将位置信息传送到服务器端,实现定位功能,同时可以发送短信到用户智能终端.该系统主要分为三个模块,包括信息采集与处理模块、服务器传送模块、用户智能终端模块.信息采集与处理模块的硬件主要由单片机、GPS模块、GPRS模块和 GSM模块等构成.该系统可以快速有效地传送地理位置信息,可应用于火灾、抢劫、迷路、车祸、失踪、急性疾病等方面的报警.     

基于GPS和LBS定位的儿童追踪系统设计

针对儿童被拐和丢失问题,文中设计了一套基于GPS和LBS定位的儿童追踪系统。该系统包括定位装置、云端服务器、手机客户端三个部分。通过获取和分析定位装置的位置、速度、电量、摘除等信息判定儿童活动是否存在异常,如果有异常情况,系统将主动向手机端发送报警短信。该追踪系统一定程度上能够为儿童提供安全保障。     

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。     

How do children do mathematics with LOGO?

Abstract  This paper considers some results of a study designed to investigate the kinds of mathematical activity undertaken by children (aged between 8 and 11) as they learned to program in LOGO. A model of learning modes is proposed, which attempts to describe the ways in which children used and acquired understanding of the programming/mathematical concepts involved. The remainder of the paper is concerned with discussing the validity and limitations of the model, and its implications for further research and curriculum development.