基于多传感器数据融合技术的力学量测量系统研究

多传感器的数据融合已经在系统智能检测领域得到越来越多的应用,本论文针对传统的数据融合算法未考虑传感器自身可靠性这一不足,分析了面向传感器可靠性的数据融合算法,并在多元力学参数检测系统中加以应用,给出了系统的总体框架,并对数据融合的具体应用进行了分析,这对于进一步提高力学参数的智能传感检测及数据融合的研究具有一定的借鉴意义。     

对称加密数据随机性定量研究

通过对加密数据使用原理以及应用范围的分析,阐述了一种基于正态分布和卡方分布的加密数据随机性定量技术。结合M atLab中现有函数erfc（x）以及chi2cdf（x,y）,计算并绘制出随机性定量图,实验分析了不同对称加密算法密文随机程度,为加密数据识别提供强有力的技术支撑。     

The MESSENGER Science Operations Center

The MESSENGER Science Operations Center (SOC) is an integrated set of subsystems and personnel whose purpose is to obtain, provide, and preserve the scientific measurements and analysis that fulfill the objectives of the MErcury Surface, Space ENvironment, GEochemistry, and Ranging (MESSENGER) mission. The SOC has two main functional areas. The first is to facilitate science instrument planning and operational activities, including related spacecraft guidance and control operations, and to work closely with the Mission Operations Center to implement those plans. The second functional area, data management and analysis, involves the receipt of science-related telemetry, reformatting and cataloging this telemetry and related ancillary information, retaining the science data for use by the MESSENGER Science Team, and preparing data archives for delivery to the Planetary Data System; and the provision of operational assistance to the instrument and science teams in executing their algorithms and generating higher-level data products.     

数据采集系统中的噪声及抗干扰指标问题

采用一种新的干扰模型表述方法来评价数据采集系统的抗干扰指标,获得了较好的效果,仿真及实际测量结果均证实了其良好的重复性和优良的分辨力。     

《机械设计基础》网上考试系统的开发与研究

通过剖析传统《机械设计基础》考试方法存在的弊端，从考试系统的建立、系统的组成与开发、系统的使用与特点等方面介绍《机械设计基础》网上考试系统的设计思路，并综合分析了网上考试系统试题的生成、在线学习和系统维护等多种功能的实现从而发挥了网络资源在教学和管理中的优势。     

基于坐标融合的大型壳体壁厚自动测量方法研究

介绍了一种基于光栅投影测量原理的大型壳体壁厚自动化测量方法及其在大型锥形壳体产品自动测量中的应用。采用基于坐标转换统一的数据拼接方法,通过对自动测量系统的多坐标系综合标定,实现了多站位扫描测量数据的精密拼接融合。利用点云检测软件Polyworks完成了产品数模比对分析和壁厚检测,并对测量系统壁厚测量不确定度进行了分析评定。结果表明,基于坐标融合的大型壳体壁厚自动测量方法可有效提高产品的检测质量和检测效率。     

On the application of Exploratory Data Analysis for characterization of space weather data sets

This paper presents an overview of the mathematical foundations for techniques in Exploratory Data Analysis (EDA) for the purpose of investigating the relationships among the numerous variables in large sets of multivariate space weather data. Specifically, we cover techniques in Principal Components Analysis (PCA) and Common Factor Analysis (CFA). These techniques are illustrated using space weather activity indices collected during the year 2002 and the corresponding noon-time hmF2 data from the International Reference Ionosphere (IRI). A CFA is used to categorize the activity indices, and a PCA is used to derive two macro-indices of activity to ascertain the strength of solar and geomagnetic activity. These macro-indices are then used to compare and contrast IRI’s noon-time hmF2 values at six different geographic stations. It was found that the correlation between hmF2 and the macro-indices more accurately represented the variation of this correlation with latitude found in previous studies than if we used an isolated conventional index, such as SSN and AE. We also found that the daily maximum value of the Polar Cap Index was dependent on both solar and geomagnetic activity, but the closely-related cross-Polar Cap Potential was solely associated with elevated levels of geomagnetic activity, which is a unique result compared to previous studies. We argue that the discrepancy can be explained by the difference in experiment designs between the two studies. This paper demonstrates the usefulness of EDA in space weather studies of large multivariate data sets.     

频分制遥测地面站总体设计

介绍某系统配套使用的频分制遥测地面站的主要技术指标、结构框图、功能和作地面站总体设计时必须考虑的几个问题。     

随机序列传输的误码检测

为了消除信息交换中随机信号的传输误码,设计一种接收器对输入的随机信号进行检测。当产生传输误码时,统计量的分布密度函数为,其中为未出现传输误码时,统计量的分布密度函数,P(y,p_σ,n)是以y=0为极小值的偶函数。以识别的最小错误概率为检测准则,检测的门限为方程P(y,p_σ,n)=1的根。因此,最小错误概率检测准则为:P(y,p_σ,n)≥1。     

基于TMS320C6701的高速信号处理系统的设计与实现

介绍一种基于 TI高性能浮点 DSP- TMS32 0 C6 70 1的高速信号处理系统。该系统完全采用软件的方法实现对中频调频信号的采集、传输、谱分析、解调等一系列的处理 ,并将处理结果通过串口上传给计算机。为了解决 DSP总线冲突的问题 ,该系统采用了两级 DMA来实现采集数据的存储。试验证明 ,该信号处理板能够在 16 0 MHz下完成调频信号的采集、传输和处理 ,且满足实时性的要求