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。     

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。     

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。     

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。     

北斗通信终端软件的设计与实现

为了对北斗卫星无线电测定业务(Radio Determination Satellite Service,RDSS)报文与卫星无线电导航业务(Radio Navigation Satellite Service,RNSS)报文的控制实现功能集成,设计一种针对北斗用户终端模块的软件系统。基于前后台分离的设计思想来构架该软件,即后台线程负责使用串口与用户终端模块通信,包括对RDSS/RNSS数据的接收解析和对RDSS数据的封装发送;前台用户界面完成数据的可视化,并实现灵活的人机交互。前后台线程之间采用并发技术实现通信数据的快速处理。     

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.     

View-based model-driven architecture for enhancing maintainability of data access services

In modern service-oriented architectures, database access is done by a special type of services, the so-called data access services (DAS). Though, particularly in data-intensive applications, using and developing DAS are very common today, the link between the DAS and their implementation, e.g. a layer of data access objects (DAOs) encapsulating the database queries, still is not sufficiently elaborated, yet. As a result, as the number of DAS grows, finding the desired DAS for reuse and/or associated documentation can become an impossible task. In this paper we focus on bridging this gap between the DAS and their implementation by presenting a view-based, model-driven data access architecture (VMDA) managing models of the DAS, DAOs and database queries in a queryable manner. Our models support tailored views of different stakeholders and are scalable with all types of DAS implementations. In this paper we show that our view-based and model driven architecture approach can enhance software development productivity and maintainability by improving DAS documentation. Moreover, our VMDA opens a wide range of applications such as evaluating DAS usage for DAS performance optimization. Furthermore, we provide tool support and illustrate the applicability of our VMDA in a large-scale case study. Finally, we quantitatively prove that our approach performs with acceptable response times.     

A pragmatic multi-method investigation of discrepant technological events: Coping,attributions, and ‘accidental’ learning

Discrepant technological events or situations that entail a problem, a misunderstanding or a difficulty with the Information Technology (IT) being employed, are common in the workplace, and can lead to frustration and avoidance behaviors. Little is known, however, about how individuals cope with these events. This paper examines these events by using a multi-method pragmatic approach informed by coping theory. The results of two studies – a critical incident study and an experiment – serve to build and test, respectively, a theoretical model that posits that individuals use a variety of strategies when dealing with these events: they experience negative emotions, make external attributions, and adopt engagement coping strategies directed at solving the event, eventually switching to a disengagement coping strategy when they feel they have no control over the situation. Furthermore, users’ efforts may result in ‘accidental’ learning as they try to overcome the discrepant IT events through engagement coping. The paper ends with a discussion of the results in light of existing literature, future opportunities for research, and implications for practice.     

The Distributed Time-Triggered Simulation Scheme: Core Principles and Supporting Execution Engine

Distributed real-time simulation is a young technology field but its practice is under increasing demands. In recent years the author and his collaborators have been establishing a new approach called the distributed time-triggered simulation (DTS) scheme which is conceptually simple and easy to use but widely applicable. The concept was initiated in the course of developing a new-generation object-oriented real-time programming scheme called the time-triggered message-triggered object (TMO) programming scheme. Some fundamental issues inherent in distributed real-time simulation that were learned during recent experimental studies are discussed along with some approaches for resolving the issues. An execution engine developed to support both the TMOs engaged in control computation and the TMOs engaged in DTS is also discussed along with its possible extensions that will enable significantly larger-scale DTSs.     

Software-Konfigurationsmanagement in großen Softwareprojekten

Zusammenfassung Mit zunehmender Größe der Softwaresysteme verschärfen sich die für die Software-Herstellung typischen Probleme: Beherrschen großer Objektmengen, Erhalten der Systemkonsistenz, Kontrolle der ständigen Änderungseinflüsse und Gewährleisten einer langen Lebensdauer. Die Disziplin Konfigurationsmanagement bildet den methodischen Ansatz, diese Probleme besser zu beherrschen. Software-Konfigurationsmanagement faßt die Herstellung von Softwaresystemen als eine Abfolge von kontrollierten Änderungen an gesicherten Zwischen- und Endergebnissen auf. Dargestellt werden die Objekte und Funktionen des Software-Konfigurationsmanagements sowie die hierfür in großen Software-Projekten benötigten Methoden, Instanzen und Hilfsmittel.     

Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and     

Editorial:Brain-machine interface(BMI) and cyborg intelligence

正Brain-machine interfaces(BMIs)aim at building a direct communication pathway between the brain and an external device,and represent an area of research where significant progress has been made during the past decade.Based on BMIs,mind information can be read out by neural signals to control     

Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and overseas to the world’s scientific circles,especially to stimulate     

SCIENCE CHINA Information Sciences SUBJECT INDEX TO VOLUME 57(2014)

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Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and overseas to the world’s scientific circles,especially to stimulate