基于DSP的MSINS/GPS组合导航计算机设计

介绍了以DSP为核心的MSINS/GPS分布式控制组合导航计算机的设计方法.为降低系统成本,选用TI公司的DSP作为导航算法处理机,采用TL16C550和MAX3160设计了RS-232/485/422多协议串口,实现该系统与主机的通信.鉴于GPS-OEM板异步串口输出的报文在接收时需要进行判断和校验,采用单片机单独控制接收,并将预处理数据存储到双口RAM中,节约CPU的时间.对于MSINS六路数据的采集,则采用CPLD作为调度机,将A/D转换结果也放于双端口RAM中.系统还采用GPS接收机输出的1PPS脉冲,结合CPLD产生的时序实现MSINS和GPS数据的同步采集.     

单片机模拟串口数据接收程序的实现及优化

进行单片机应用系统设计开发时,往往碰到单片机自身携带的串口不够用,这时就需要通过I/O口模拟串口通信.本文简单介绍了串口通信的基础知识,分析了模拟串口接收数据的过程,介绍了模拟串口接收数据的实现方法,以ATmega64A单片机为例,详细介绍了模拟串口数据接收程序的实现及优化方法.     

基于单片机的GPS车载模块研究

首先对基于GPS/GPRS的计算机网络车辆管理系统进行了总体结构设计,然后以AVR单片机作为主控制器,由GPS模块接收车辆运动状态信息,经单片机同步串口写入GPS数据流,一方面通过连接GPRS网络,定时传送数据至指挥中心;另一方面,判断GPS数据速度值,满足设定要求则存储到Flash中.在车辆回库后,nRF905模块接收呼叫信号,若地址匹配则由单片机读取Flash中的存储数据,经过SPI通信将数据写入nRF905,最终发送至监控中心.由此实现了系统独特的实时和滞后管理功能.     

基于穿戴型北斗终端的人员安全管理软件设计

针对野外人员定位和通信不便的问题,设计了一种在手机安卓系统上运行的人员安全管理软件。通过蓝牙应用层协议,实现与穿戴型北斗终端的人机交互,可监控终端工作状态和调整工作参数;通过接收终端的位置信息,实现北斗/GPS双模定位、电子/卫星地图导航、轨迹回放;利用终端的通信功能,实现基于北斗短报文的险情上报和应急指挥。应用结果表明,软件可满足艰险地区野外工作安全管理需要。     

一种低成本便携式机载导航设备

"低、慢、小"飞行器的监控是低空空域开放的一个技术难题,制约通航的发展速度.本文针对"低、慢、小"航空器运行特点,设计一种低成本、小体积和低功耗的导航通信设备,该设备集成了GPS、北斗、伽利略导航源以及北斗短报文通信功能,利用民航的ADS-B通信数据链及北斗短报文接收系统,不仅将"低、慢、小"飞行器纳入了民航的通信导航...     

GNSS-R定位数据处理软件的设计与实现

随着GNSS-R技术的迅速发展和应用领域的增多,对GNSS-R的多卫星系统的研究显得尤为重要,目前GPS单系统得到了很好的应用,但是GPS单系统不能满足GNSS-R的应用领域,在此发展的趋势下本设计对GPS/BD双系统进行了探索.GNSS-R反演的应用需要导航定位信息提供探测区域接收平台和卫星的详细信息.主要设计完成了GPS/BD双系统定位数据处理软件,包括GPS/BD双系统定位信息的快速接收和数据的正确提取及显示;利用串口通信实现信息的接收及控制命令的发送;可见星星座图显示、状态监控窗口显示和卫星跟踪信息显示等功能;并根据定位数据进行镜面反射点的计算.经过实际工程项目的测试,本软件具有较好的实时性和实用性.     

基于MIMU/GSP的双核微系统的设计与应用

为了提高导航精度,设计了以DSP+单片机双处理器为核心的MIMU/GPS组合导航微处理器系统,采用单片机+双口RAM采集GPS数据并缓存,DSP对数据并行读取,既节约了CPU时间,又实现了对IMU的高采样率;采用TL16C550A与MAX232和主机异步串行通信,来实现DSP和上位机的高速通信,并对数据实时显示;整个系统采用CPLD为时序控制,并利用1PPS脉冲和CPLD时钟分频实现MIMU和GPS数据的同步采集。本系统在中北大学周边路段进行跑车实验,以5K的采样率对惯性测量单元采样,同时能够完成周期内的导航解算,避免了串口通信带来的CPU时间等待;同时系统以1PPS为时间基准触发DSP中断能够保证数据采集和读取的实时性。通过实验验证,本系统具有高采样率,实时性好的优点,为组合导航系统的研究提供硬件平台,在实际的工程应用中具有一定的参考价值。     

基于GM8123/8125的单片机串口扩展电路

在以MCS-51单片机为核心的应用系统中,经常需要将其单个串口扩展为多个串口,以实现多串口通信。以AT89S51单片机为例,提出了基于GM8123/8125的串口扩展方案,实际应用表明该方案使用简单、通讯可靠、与标准串口通信格式兼容,解决了单片机在串行通信应用系统中的串口局限问题。     

基于ARM的车载导航定位终端硬件设计

本文研究与设计了一种新型车载导航定位系统的车载导航定位终端,该定位终端以32位ARM微处理器、GPS模块及GSM/GPRS模块为核心。详细介绍了终端的电源系统、通信接口、摄像系统与采集系统的设计,提出了采用ARM的2个32位定时器和PWM定时器配置,结合软件模拟全双工通信串口的新技术,共模拟了5个全双工通信串口,解决了对串口资源的需求。试验表明这种新型车载终端能满足导航定位的需求。     

嵌入式组合导航系统中多路异步串口系统的设计

在嵌入式组合导航系统中,对导航计算机进行串口扩展是实现导航计算机和多个异步串口导航设备进行数据通信的重要前提。针对目前的串口扩展法无法有效利用串口扩展芯片内部FIFO的问题,提出了一种基于数据拆分的串口扩展法,并依据该方法设计了以MSP430F149单片机和TL16C554A芯片为核心的多路异步串口系统。试验证明,该方法能有效地利用串口扩展芯片的内部FIFO,提高了系统的串口通信效率。     

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.