基于DSP的光纤捷联惯导系统设计与实现

介绍了一种基于DSP的光纤陀螺捷联惯导系统的设计与实现方法;系统采用DSP+MCU的体系结构,DSP主要完成导航计算,利用单片机实现对数据采集模块的控制,并通过双口RAM实现单片机和DSP的数据通信,构成了一套小型捷联惯导系统,同时给出了一种捷联惯导算法编排,简要介绍了SPI通信和TMS320C6713的二次bootloder方式;经测试,系统速度和精度都满足了设计要求,已应用于实际系统。     

基于DSP的捷联惯导数据采集系统设计

针对捷联惯导系统对于精度和实时性等要求,介绍了基于DSP的捷联惯导数据采集系统的构成及技术实现.采用高速的DSP和CPLD设计了捷联惯导数据采集系统的硬件电路,实现了惯性器件信息的快速采集及其处理,从而满足复杂算法对于处理速度的要求,同时也提高了系统的集成度,实现了系统设计的小型化;设计了串行通信和显示模块,用于数据的交换以及实时显示;分析了系统硬件电路设计过程中可能存在的噪声干扰,并给出了相应的抑制方法.实验结果表明,各项指标均已达到了设计时的要求.     

基于NiosⅡ处理器的通用AD IP核的设计与实现

提出了一种采用基于NiosⅡ处理器的通用AD IP核来实现嵌入式数据采集系统的新方案。它能将市面上任意一款AD芯片制作成IP核并集成到NiosⅡ系统中使用,且整个IP核的控制与运算逻辑由一片FPGA芯片来完成。     

基于NiosⅡ多核驾驶疲劳检测系统设计

采用SOPC技术,对多核驾驶疲劳检测系统进行了研究与设计.为了实现系统设计的单片化,把NiosⅡ软核处理器、摄像头采集控制器IP核、部分图像处理算法模块等系统部件都集成到一块FPGA上.为了提高系统处理速度,系统采用双NiosⅡ软核处理器设计,同时利用NiosⅡ处理器自定制指令与C2H加速编译工具对系统中关键部分进行硬件加速,使系统具有实时性检测功能.     

多普勒雷达/光纤捷联惯导组合导航同步方法研究

针对采用ARINC429总线通信的多普勒雷达/光纤捷联惯导直升机机载自主组合导航系统的时间同步问题,提出了一种有效的多普勒雷达同惯导间的软件同步方法;通过判断ARINC429总线上多普勒雷达信号的Label位标志,结合光纤捷联惯导的5ms中断时刻和嵌入式导航计算机提供的计时器,采用插值和外推的方法实现了多普勒雷达与光纤捷联惯导间信号的同步;最后对所设计的系统进行了长航时地面动态跑车试验,系统经同步后的的定位精度验证了所提方法的合理性和有效性。     

基于捷联惯导系统的舰艇垂向位移测量技术

给出了舰艇垂向位移的定义,对捷联惯导系统解算中的舒勒振荡周期误差进行了说明.在分析舒勒振荡周期误差对于垂向位移测量影响的基础上,设计了利用捷联惯导系统测量舰艇垂向位移的方案.在该方案中引入了FIR数字高通滤波器.并给出滤波器系数组的设计过程.最后利用自研的捷联惯导系统与四自由度平台验证了提出方案的有效性.     

三单元体旋转型惯导系统数据采集关键技术研究

三单元体旋转型捷联惯导系统相对传统捷联惯导系统和现有的其它旋转型惯导系统都具有诸多优势,但对其数据采集环节也提出了一些新问题。针对系统数据采集量大、同步性要求高等特点,详细分析了惯性器件之间、惯性器件与光栅之间数据采集时间不同步的影响,提出了相应解决方案;针对温度采集易受电机旋转影响的现象,具体阐述了造成影响的原因,采取了相应措施,并从硬件上设计了一种数字式温度传感器DS18b20与DSP通讯的新模式。测试结果表明,数据采集单元达到了预期设计指标,为高精度低成本惯导系统的实现建立了基础。     

基于NiosⅡ的智能多接口片上系统设计

设计了一种基于NiosⅡ处理器的片上系统(SoC),集成了NiosⅡ处理器IP、PCI接口IP、网络接口IP以及基于Wishbone总线的串行接口IP核、CAN接口IP核等。系统具有可重配置、可扩展、灵活、兼容性高、功耗低等优点,适合于片上系统开发与应用。本设计使用Verilog HDL硬件描述语言在QuartusⅡ环境下进行IP软核设计、综合、布局布线,在Model Sim下完成功能、时序仿真,在SoPC下完成系统的定制与集成,在NiosⅡ IDE环境下完成片上系统软件程序的开发,最后在FPGA器件上实现了智能多接口功能的片上系统。     

一种光纤陀螺漂移数据建模和滤波技术在捷联罗经法自对准中的应用

针对基于高精度光纤陀螺仪(FOG)的捷联惯导系统开展研究.采用时间序列分析法对光纤陀螺随机漂移进行分析,建立自回归滑动平均(ARMA)模型,并在捷联惯导系统罗经法自对准过程中对光纤陀螺漂移数据进行实时滤波估计.样机实验结果表明,所提出的方法可以有效地提高光纤陀螺捷联惯导系统罗经法自对准的精度.     

基于ARM的微型捷联惯导计算机设计

为了实现低成本小型制导武器的小型化和低成本化,设计了微型捷联惯导计算机系统;充分利用ARM器件和MEMS器件的微型化特点,以ARM嵌入式处理器为核心,MEMS微惯性测量单元为敏感器,构建了捷联惯导系统的硬件平台.根据捷联惯导系统原理,通过对姿态更新和位置速度更新算法的研究编写了硬件可执行程序;然后,进行了捷联惯导的定位和测姿试验;结果表明以ARM作为微型捷联惯导计算机满足了设计要求,系统稳定可靠.     

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.