平均绝对差图象匹配系统的定位精度

本文证明了两个基本定理。在假定图象信号和附加噪声是相互独立的零均值齐次高斯随机场、且二次可微的条件下,解决了平均绝对差图象匹配系统的定位精度的分析和计算问题。用实例说明了精度分析和计算的方法,分析了影响定位精度的因素和参数。为匹配性能的定量分析提供了理论依据和方法。     

基于NiosII的SoPC系统在时统系统中的应用开发

N iosII处理器是一种用户可随时配置和构建的32位指令集和数据通道的嵌入式系统微处理器IP核,与传统的8/16位系统相比,无论处理器的结构还是开发手段上都发生了较大变化。本文主要介绍了N iosII的性能特点和基于N iosII的SoPC系统的功能构架,给出了基于N iosII处理器的SoPC系统在时统系统中的一种应用方案。其中重点介绍了该方案的SoPC系统设计实现和软件设计实现。     

浅谈城市会议中心水处理系统的改造方案

通过对某城市会议中心用水系统的实际考察，找出了存在的问题，提出了采用“射频式水处理器”对用水系统进行水处理的改造方案，达到既防止系统结垢，又能减少管网腐蚀，达到维持系统安全稳定运行的目的。     

基于马尔可夫蒙特卡洛法的系统辨识方法研究及应用

提出了基于马尔可夫蒙特卡洛(MCMC)的贝叶斯辨识方法,以解决高超声速飞行器系统辨识中复杂动力学模型转换为简单或稀疏模型所带来的不确定性问题,以及存在的训练数据大和积分难处理的问题。该方法将数据退火算法引入MCMC中,不仅解决了MCMC易陷入局部最优的问题,并且将数据退火与“高信息训练数据”的概念相结合,能够以较低的计算成本分析大数据集。此外,该方法可以对参数估计过程中存在的不确定性进行量化,获得未知参数的最优估计值。通过仿真实验,验证了提出的系统辨识方法的有效性,辨识出的模型能够有效应用于控制器设计之中,并获得较好的控制效果。     

基于SysML的远程专家保障装备体系建模及结构评估

未来联合作战呈现出体系对抗体系的特点,为满足作战需求对武器装备体系设计提出了更高的要求,实现动态作战环境下武器装备体系结构建模和评估是体系设计中的重要内容。基于联合作战背景下的远程专家保障装备体系想定,从体系作战需求角度出发通过SysML(系统建模语言)建立体系结构模型,设计远程专家保障装备体系结构视图产品,结合ExtendSim建立了可执行模型,并进行仿真分析和结构评估,为提升体系能力提出有效可行的建议。     

Examining the effects of anti-space weaponization arguments in the media: Some experimental findings from Canada

This study examines how political activists are framing the space weaponization debate in Canada and whether their arguments can influence public attitudes and perceptions about the issue. Eighty university students from two undergraduate courses were recruited as participants in a quasi-experiment. One class (n = 38) was exposed to the documentary Masters of Space, an episode of the Canadian Broadcasting Corporation's program The Nature of Things, and another class (n = 42) served as the control group. Pre-test and post-test questionnaires were used to measure the effects of viewing anti-weaponization arguments in the media, while also controlling for the influence of prior beliefs and background characteristics of participants. Results suggest that visually depicting the use of satellite technology in society can convince viewers that satellites are important to their way of life, but not necessarily to the defense of North America. Framing missile defense as a ‘space weapon in disguise’ also seemed to raise opposition to Canada's participation in continental missile defense. The findings, meanwhile, indicate that viewers respond strongly to the issue of space debris and that mobilizing support for joint military space projects may best be achieved by emphasizing the usefulness of these projects for locating and tracking such debris. In the end, media exposure seemed to help legitimize anti-weaponization arguments based more on rational self-interests than on idealistic beliefs. These findings can have implications for the way space policies are communicated to the public.     

基于DSP的航空发动机分布式控制

在航空发动机分布式控制系统的研究过程中,为保证系统的可靠性,对通讯总线的实时性和确定性提出了更高的要求。在现有航空发动机分布式控制系统CAN总线的研究成果基础上,提出将时间触发TTCAN总线应用于发动机分布式控制通讯总线的设想。针对航空发动机分布式控制系统平台讨论了TTCAN总线可行的通讯方案,给出TTCAN网络节点详细软件和硬件设计,并建立了通信试验平台。试验结果表明:TTCAN总线对于航空发动机分布式控制系统而言具有良好应用前景。     

打造廊坊生态、智能、休闲、商务之城的政府绩效管理体系构建研究

"生态、智能、休闲、商务"8个字,是廊坊城市发展的核心定位。在廊坊城市蓬勃发展的同时,社会各界对政府在承担公共管理责任中是否进行有效管理,其效率和效果由谁来评价,以及怎么评价政府绩效等问题的关注程度越来越高,也越来越迫切。基于此,本文以政府绩效管理内涵入手,分析廊坊市政府绩效管理的发展现状以及存在的主要问题,进而探讨在打造廊坊生态、智能、休闲、商务之城中如何构建政府绩效管理体系,并提出相关改进措施。     

某型飞机反推力装置加载试验

由于反推力系统必须在模拟气动载荷下做试验,以验证反推力系统功能的安全可靠性。因此在液压系统地面模拟试验中需配置一套反推力装置加载系统,以实现对反推力在展开和收起过程中所受气动载荷的模拟。在简要介绍反推力系统及其加载系统的基础上,主要研究如何完成某型飞机反推力装置加载试验,并满足其性能要求。     

A novel system parameters design and performance analysis method for Distributed Satellite-borne SAR system

As a promising new technology emerged in recent years, the Distributed Satellite-borne SAR (DSS) system with Interferometric Synthetic Aperture Radar (InSAR) imaging capability has been recognized by the remote sensing community as an integrated part of the spaceborne earth observation system. However, most researches on DSS were focused on individual aspects of system design/analysis and data processing, while few studies have been dedicated to establishing a standard methodological framework for universal DSS system design. Aiming at this problem, the topics of DSS system error analysis and design method are investigated in this paper. Firstly, a rigorous error propagation model of height measurement is theoretically derived from the DSS InSAR imaging geometry, and the impact of each error sources in this model on the height measurement accuracy is analyzed individually. In particular, the baseline length and its measurement error in the InSAR imaging plane are identified as the dominant factors. Second, a new method for DSS system design is proposed based on our analyses with the error propagation model. This method consists of two important phases, namely collaboration design and monostatic design. The major objective of collaboration design is to determine the configuration and parameters for the coordination between satellites in the DSS system. Afterwards, the key parameters for single satellite and the payload are determined by the monostatic design. Thirdly, a system performance analysis method is developed to comprehensively evaluate the performance of the pre-designed DSS system. In the next section, a typical example of DSS system design is given to demonstrate the effectiveness of the proposed system design and analysis methods. The target DSS system has the same goal and hardware configuration as the TanDEM-X mission. Finally, the conclusion is drawn with our major findings are presented.