高精度动平衡测量系统中的信噪比很低,尤其是在邻近频率干扰背景下,常规的快速博里叶变换(fast Fourier trasformation,FFT)等方法无法准确提取不平衡信号.提出一种基于谐波小波和Prony算法的不平衡信号提取方法,先采用自适应谐波小波带通滤波提高信噪比,然后以滤波后的数据作为样本,采用Prony算法识别不平衡信号的幅值和相位,有效解决了邻近频率干扰导致的不平衡信号无法准确提取的问题.仿真和实验结果表明,该方法具有精度高、重复性好等优点,特别适合于信噪比较低的高精度动平衡测量系统中.

关键词：不平衡信号；谐波小波；Prony算法；邻近频率干扰

查看摘要

表面肌电信号(surface electromyogram,sEMG)的采集是仿人假手智能控制研究的重要环节,而便携式表面肌电信号采集装置可使受试者摆脱固定空间和线缆的束缚.研制了一套多通道sEMG无线采集系统.该系统主要由神经电势芯片、DAC、PIC16F628A和XBee802.15.4芯片等组成,其无线采集接收端采用串口与计算机相连.开展sEMG无线采集系统离体测试实验,证明该无线采集系统的可行性和性能,在此基础上设计并开展了基于该多通道sEMG无线采集系统的3名志愿者手部运动sEMG的实时无线六通道采集.实验结果表明,该多通道sEMG无线采集系统可在1 m内实现最高57.6 Kb/s波特率的数据采集,其误码率为8.93 × 10-4,可忽略不计.搭建的多通道sEMG无线采集系统能够实现正常人体在简单手臂动作时的sEMG信号的无线实时多通道采集,为进一步设计在复杂人手运动时sEMG无线采集系统提供了一个有效的硬件平台.

关键词：人体假手；表面肌电信号；无线采集；多通道

查看摘要

位置姿态系统(position and orientation system,POS)作为航空遥感中运动补偿的通用载荷,其精度直接影响成像质量.为提高POS的定位定姿精度,在15维传统误差模型的基础上考虑了陀螺和加速度计的刻度因子误差和安装误差的标定残差对POS精度的影响,并使用随机常值、一阶马尔科夫过程表示陀螺随机漂移和加速度计随机偏置,建立了一个39维的高阶误差模型.为了评价该模型的准确性和实用性,将其与其他的误差模型比较,进行了POS与相机的联合飞行实验.实验结果表明,基于39维高阶误差模型的POS精度较其他的误差模型有明显提高.

关键词：位置姿态系统；高阶误差模型；卡尔曼滤波器；可观测度

查看摘要

相控阵雷达(phased array radar,PAR)可通过合理配置工作参数优化其性能.针对机载相控阵雷达目标探测过程中的射频隐身需求,提出了一种雷达工作参数优化方法.首先建立了以评估发现目标能力的检测概率和评估射频隐身能力的截获概率为指标,以脉冲峰值功率和驻留时间为优化参数的雷达探测多目标优化模型;然后根据多目标优化理论,采用改进非支配遗传算法(improved non-dominated sorting genetic algorithm Ⅱ,NSGA-Ⅱ)求解Pareto最优解集,并由这些Pareto解构成决策矩阵;最后,利用熵权法对各个目标进行客观赋权,再运用逼近理想解的排序法(techninque for order preference by similarity to an ideal solution,TOPSIS)进行多属性决策(multi-attribute decision making,MADM),得到参数控制方案.结合具体实例进行仿真计算,结果表明,运用多目标优化理论可以有效地配置雷达工作参数,优化雷达工作性能.

关键词：相控阵雷达；射频隐身；检测概率；截获概率；多目标优化；多属性决策

查看摘要

利用USB通信和无线通信,设计了新型动物机器人智能监控系统.系统由PC监控软件、信号发射器、接收控制器等部分组成.与以往系统相比,该系统不仅可实现动物机器人行为控制,还可实现行为监测以及环境数据实时采集,具有微体积、微功耗等特点.经动物实验表明,该系统通信可靠、工作时间长、控制准确、操作方便、数据采集精确,将为动物机器人的实时监控提供有力的技术支持.

关键词：动物机器人；智能监控；行为控制；脑机接口

查看摘要

Gas analyzers are instruments that analyze a mixture of gases to measure the physical and physiochemical properties of the gas mixture. These instruments are also used to detect the gas composites and monitor the level of each gas present in the gas mixture. Gas analyzers can be categorized into two types, namely online and offline gas analyzers. Online gas analyzers provide faster and more efficient analysis and outputs than offline gas analyzers. These analyzers are widely used for environment monitoring applications to monitor the greenhouse gases and other pollutants emitted by manufacturing plants. Online gas analyzers are also used across various industries to monitor air pollutants in order to meet the regulations implemented by several governments across the world.

关键词：气体分析仪；分析测量；混合物；工具

查看摘要 索取原文[55页]

关键词：智能传感器；传感器网络

查看摘要 索取原文[1页]

Spectroscopy is a technique that is used to analyze the elements or compounds found in substances. This analysis is conducted with the help of spectral instruments by measuring the radiation intensity as a function of the wavelength. The spectral instruments used in spectroscopy are referred to as spectrometers or spectral analyzers. It can be used to determine the mass, structure, and composition of the substance under consideration. Spectroscopy analyzes the substances in the most effective way and produces accurate results. These results are helpful in yielding technological innovations in various areas such as pharmaceutical research, scientific research in biotechnology and life sciences, and industrial processes that include automotive, semiconductor, and metal mining applications.The Global Spectroscopy market is expected to grow at a moderate rate during the period 2012-2016. In terms of regional distribution, the Americas dominated the market, accounting for the highest share of the total revenue in 2012. The Americas was followed by the EMEA and the APAC regions. The overall market is forecast to grow at a CAGR of 5.2 percent during the forecast period.

关键词：光谱仪器；光谱技术；分析物质；元素；化合物

查看摘要 索取原文[85页]

本报告是独特的研究中国各行业的工具。它包括对宏观环境的描述、对投资吸引力的分析、详细的收入分析以及对广泛的财务比率的深度分析。

关键词：地质勘探；地震专用仪器；趋势分析

查看摘要 索取原文[33页]

A gas analyzer is an instrument that analyzes a mixture of gases to measure the physical and physiochemical properties of the gas mixture. It is also used to detect the gas composites and monitor the level of each gas in the gas mixture. Gas analyzers can be categorized into two types: online and offline gas analyzers. Online gas analyzers provide faster and cheaper analysis and outputs than offline gas analyzers. Online gas analyzers are widely used for environment monitoring applications to monitor the greenhouse gases and other pollutants from manufacturing plants.China is one of the key leading countries in the Global Online Gas Analyzer market. The market is growing faster in China than in many developed and developing countries because of the emergence of various process manufacturing industries in China. The Online Gas Analyzer market in China is expected to grow at a CAGR of 12.81 percent during the period 2012–2016.

关键词：气体分析仪；在线气体分析仪；离线气体分析仪

查看摘要 索取原文[34页]