小型无人机地面监控站的设计与实现

无人机地面监控站是实现无人机系统调试及可靠应用的基本保障,其提供的人机交互界面可使无人机在执行任务过程中充分发挥人的主观能动作用.介绍了一种小型无人直升机监控站软件,基于801.11b协议及UDP协议实现无人机与地面监控平台实时通信系统.建立了完备的上下行数据链,基于MFC实现了无人机状态观测、PID参数在线调试、路径规划以及飞行数据保存等功能.为无人机控制调试及稳定应用提供了一个安全可靠的监控平台.     

无人机飞行数据通用化译码软件设计及实现

飞行数据记录了无人机飞行过程中的状态信息和性能参数,在无人机控制律优化、飞行评估、故障诊断、事故调查分析、地勤保障等得到广泛应用.在总结无人机飞行数据记录格式和译码原理的基础上,详细阐述了基于XML配置文件实现飞行数据通用化译码的过程,设计了XML配置文件格式,运用基于DOM模型的TinyXml解析XML文件.最后,以...     

基于虚拟现实的无人机三维可视化仿真

在论述虚拟现实和无人机技术的基础上,详细介绍了利用Visual C 和OpenGL实现基于虚拟现实的无人机三维可视化仿真的设计方案.针对无人机虚拟现实实现过程中的若干关键技术进行了重点的论述,如飞机本体的建模、飞机尾焰、场景、地形、数据交换等,最后给出了利用该仿真软件回放飞行数据,重现了飞行场景的虚拟环境;通过该方案实现的无人机虚拟仿真系统能够将无人机飞行数据以更自然、更易理解的图像形式展示,有较高的工程应用价值.     

基于VxWorks时钟特性的无人机飞行数据抗干扰方法研究及实现

为解决当无人机受到干扰时,飞行数据采集异常情况从而导致无人机无法正常工作的情况,文章提出了一种适合无人机系统使用基于VxWorks并行时钟工作特性的无人机飞行数据抗干扰方法;并给出关键技术的研究途径和工程实现方法;经理论分析,本方法有效的解决无人机飞行数据的抗干扰问题;最后通过飞行实验数据表明本方法抗干扰性能良好,并且不会对无人机系统的硬件设计和实时性产生影响,可应用在无人机系统设计中。     

无人机仿真训练系统

为了满足无人机地面操纵人员的训练需求,以某新型无人机为应用背景设计并实现了一种“无人机仿真训练系统”,该文介绍了该系统的构成及其在计算机上的实现过程,并提出了运用小波分析的方法对飞行数据进行滤波。该系统集指挥控制、链路通信、飞控模块、任务载荷及视景显示于一体,重现了无人机操纵人员控制该新型无人机的全过程。对于训练操纵人员,该“无人机仿真训练系统”是一种缩短培训周期,减少费用,更为先进的训练方法。该系统的研制成功,对于提高训练无人机操纵人员的效率和扩大新型无人机的广泛应用具有重要意义。     

无人机海量飞行数据快速检索方法研究

对无人机数据库中海量飞行数据进行快速准确的检索,能够为无人机的安全飞行提供可靠的保障;传统的数据检索方法进行海量飞行数据检索的过程中,没有考虑飞行数据之间的联系,在检索的过程中需要频繁扫描数据库,降低了挖掘效率;提出一种基于模糊粗糙集算法的无人机海量飞行数据检索方法;该算法在充分考虑到飞行数据之间的联系的前提下,利用自动标引技术对数据库中的实时飞行数据进行分析,再利用特征向量进行飞行数据的内部描述,计算飞行数据检索的模糊表示的上、下近似集,建立海量飞行数据检索模型,根据模型的输出结果利用布尔逻辑进行模糊匹配,最终检索出与查询的关键词近似的飞行数据,并将检索结果按照相似度进行排序;实验结果表明,该算法能够提高检索的效率,效果令人满意。     

无人机数据库中海量飞行数据快速检索模型设计

对无人机数据库中海量飞行数据进行快速准确的检索,能够为无人机的安全飞行提供可靠的保障。传统的数据检索方法进行海量飞行数据检索的过程中,没有考虑飞行数据之间的联系,在检索的过程中需要频繁扫描数据库,降低了挖掘效率。提出一种基于模糊粗糙集算法的无人机数据库中海量飞行数据检索方法。该算法在充分考虑到飞行数据之间的联系的前提下,利用自动标引技术对数据库中的实时飞行数据进行分析,再利用特征向量进行飞行数据的内部描述,计算飞行数据检索的模糊表示的上、下近似集,建立海量飞行数据检索模型,根据模型的输出结果利用布尔逻辑进行模糊匹配,最终检索出与查询的关键词近似的飞行数据,并将检索结果按照相似度进行排序。实验结果表明,该算法能够提高检索的效率,效果令人满意。     

基于OGRE的无人机全轨迹实时视景仿真系统

通过构建无人机全轨迹实时视景仿真系统,用于无人机全轨迹实时视景显示和运动模拟。该系统以开源的OGRE图形引擎作为基础,并结合建模软件3ds max,开源场景编辑器Ogre SE,及导入工具Ogremax,构建了全轨迹视景仿真所需要的三维机体模型,以及起飞阶段,巡航阶段和降落阶段的三维场景模型。通过编写解析函数库在OGRE图形引擎中解析和渲染场景。运用基于轴对齐包围盒(Axis-Aligned Bounding Box-AABB)的射线碰撞检测算法进行无人机投弹和击中目标爆炸效果模拟。通过开源的CEGUI图形界面库进行系统的人机界面的设计与构建,用于飞行数据的显示和人机交互。同时运用基于UDP的通信方式与d SAPCE实时运算主控机进行通信,使得视景系统能够实时地展示无人机飞行状态。最后通过联合实验验证视景系统的各项功能。     

一种小型无人机高度定位方法的研究与实现

简要介绍了小型无人机总体架构与自主飞行策略,在此基础上重点阐述了无人机高度测量与控制的硬件设计与软件算法实现.通过一种数据融合算法将GPS、声纳与气压计组成的多传感器高度测量数据处理后融合到GPS/INS组合导航系统中实现无人机的精确姿态控制与轨迹跟踪.实际飞行数据表明,飞控系统的硬件设计与软件算法实现配合良好,能达到预期的飞行效果.     

基于RTOS的飞行数据采集系统

介绍一种飞行数据采集系统的设计与实现。该系统基于LPC2138 ARM7和USOSⅡ嵌入式实时操作系统,具有实时、高频率的飞行数据采集功能;提供的USB HST接口,可使用普通U盘读取数据,同时系统提供了仿DOS的人机接口命令,方便用户对系统内数据的管理。该系统为小型无人机建模提供了技术支持。     

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。