共查询到20条相似文献，搜索用时 109 毫秒
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基于P300的脑机接口系统研究 总被引：3，自引：0，他引：3
设计了Oddball刺激程序及诱发电位P300实验方案，对实验所采集到的含有诱发电位信号的EEG数据进行了预处理和模式识别方法的研究，初步建立了基于诱发电位P300的BCI系统的信号采集与处理模型，分别利用小波变换、相干平均方法对P300信号进行提取，尤其是诱发电位的少次提取对实现实时BCI系统具有重要意义，为将来实现基于诱发电位P300的实时BCI系统打下了坚实的基础。 相似文献
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高速图像采集技术广泛应用于图像信号传输与处理、模式识别和工业控制领域。利用FPGA技术将串行的LVDS和Hotlink格式的图像信号进行变换和处理,转换为标准的16位并行数据,再由USB接口控制芯片CY7C68013A将数据按照USB2.0协议标准,完成与上位机的数据通信。最大数据传输率可达1 764Mbit/s。 相似文献
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无线通信信号的调制方式识别是复杂电磁环境下频谱检测和频率控制的重要研究目标,为了实现频谱共存条件下调制信号的模式识别,通过利用范围区间和灵敏度参数构造参考信号,提出了一种带参考信号约束的独立分量分析(CICA)算法进行无线通信信号分离,实验仿真表明CICA算法能够很好地分离出感兴趣的信号,在0dB信噪比下分离信号和源信号的相似系数高于60%,与传统ICA方法相比,分离效果有了明显的提升。 相似文献
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徐立彬 《河北北方学院学报(社会科学版)》2013,(5):70-72
在体育运动中,一个完整的技术动作其实质就是一个完整的信息结构模式,运动员对动作的判断实际上就是对运动信息结构模式的识别。运动员之所以能够对动作进行准确、快速的识别、预判、决策和反应,是因为他们在长期的运动训练和比赛过程中形成了专门化的知识结构(组块或模板)。通过综述运动员技战术模式识别特征的研究进展情况,为体育运动领域模式识别的研究提供新的研究方法和思路,进而丰富和发展运动认知心理学的理论模型。 相似文献
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场发射扫描电子显微镜(FESEM)可以有效地显示材料表面和断面信息,是材料显微结构分析的主要手段之一。FESEM有上下两个二次电子探测器,二次电子上探测器的分辨率较高、信噪比好;二次电子下探测器采集角度小,图像立体感较强,且可以减少荷电现象。此外,较二次电子下探测器而言,二次电子上探测器可以接受更多背散射信号,因此,上探测器采集的图像中成分信息量更大。由于上下两个二次电子探测器的性能有所差异,在实际工作中需要根据不同的测试要求,灵活地选择二次电子探测器,以获得较好的扫描电镜图像。 相似文献
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针对滚动轴承实验需求,提出一种基于LabVIEW开发的远程滚动轴承故障诊断实验系统。该实验系统通过校园网进行远程实验操作,通过实验客户端,可以完成振动实验台的控制和监视,滚动轴承振动信号的采集和分析。信号采集可以同时采集X轴、Y轴和Z轴三个方向的振动信号。滚动轴承振动信号的分析方法包括共振解调法、短时Fourier变换、Hilbert-Huang变换、小波变换和自适应最优核(AOK)时频分析等方法。应用表明,该实验系统使用简单方便,可以节约实验成本,最大限度利用实验室资源,能够满足滚动轴承故障诊断实验的要求,也为滚动轴承故障诊断方法的研究提供了实验设备支持。 相似文献
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This paper presents an effective method for motion classification using the surface electromyographic (sEMG) signal collected
from the forearm. Given the nonlinear and time-varying nature of EMG signal, the wavelet packet transform (WPT) is introduced
to extract time-frequency joint information. Then the multi-class classifier based on the least squares support vector machine
(LS-SVM) is constructed and verified in the various motion classification tasks. The results of contrastive experiments show
that different motions can be identified with high accuracy by the presented method. Furthermore, compared with other classifiers
with different features, the performance indicates the potential of the SVM techniques combined with WPT in motion classification. 相似文献
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A new approach is proposed in this paper for the problem of the target motion analysis (TMA) with signal propagation time delay. This problem is an unobservable tracking problem in which the acoustic signal transmits with time delay. We present an intelligent range parameterized unscented Kalman filter (IRPUKF) algorithm to estimate the state of the nonlinear unobservable tracking system and propose a recursive model parameter online adjustment method to deal with the time delay in signal propagation. In a simulation of tracking target using a maneuvering acoustic sensor with signal time delay case study, the effectiveness and efficiency of the proposed algorithm is testified to perform better, compared with the range parameterized extended Kalman filter (RPEKF) algorithm. 相似文献
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吴琛 《福建工程学院学报》2012,(1):5-11
地震动是一种典型的时序非平稳信号,采用Hilbert-Huang变换(HHT)对其进行分析较传统分析方法有着天然的优越性。文章在介绍HHT基本原理的基础上,比较了HHT与Fourier变换在适用条件、时间分辨率和谱分析结果上的差异,以及HHT与小波变换在基底、重构误差、时频分辨率和谱分析结果上的不同。分析结果表明,HHT是对以Fourier变换为基础的线性和稳态谱分析的一个重大突破,它较传统的信号分析方法更加适合地震动的处理与分析。 相似文献
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INTRODUCTION Surface EMG signal recorded from the skin surface over limb muscles in the process of limmovement is called action surface EMG (ASEMGsignal. Containing the electrical and functional properties of limb muscle contraction and providing thinformation on the neuromuscular activity fromwhich ASEMG signal originates, ASEMG signal habeen widely applied in rehabilitation and the controlof prosthetic devices for the individuals with amputations or congenitally deficient limbs … 相似文献
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基于分形维前臂动作表面肌电信号的分类 总被引：1，自引：0，他引：1
通过分形维对表面肌电信号进行识别分类.在30个健康志愿者做前臂内旋和外旋时,从他们的右前臂肌前群分别采集2类动作表面肌电信号.当原始动作表面肌电信号用小波包变换分解成几个子信号后,采用一种基于模糊自相似性的方法计算原始信号和4个子信号的分形维.结果表明:从频带0～125 Hz的子信号求得的内旋和外旋动作表面肌电信号的分形维有各自的范围;通过该分形维进行Bayes决策时,错误识别率仅2.26%.因此,该分形维适合用来识别内旋和外旋动作表面肌电信号. 相似文献
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针对交流伺服运动控制系统具有系统性、工程应用性强等特点,在传统板书教学的基础上,利用多媒体教学,计算机仿真工具,网络教学等手段,采用了课堂教学、专业方向课程设计、综合实验、科研拓展的培养模式进行了课程建设的探索,实践证明,此教学模式提高了课堂的教学效果、学生学习的主动性和工程实践能力。 相似文献
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XIE Chun-lai CHEUNG Chun-ho LIU Wei-zhong 《浙江大学学报(A卷英文版)》2007,8(8):1304-1310
In this paper,we propose a novel adjustable multiple cross-hexagonal search(AMCHS) algorithm for fast block motion estimation. It employs adjustable multiple cross search patterns(AMCSP) in the first step and then uses half-way-skip and half-way-stop technique to determine whether to employ two hexagonal search patterns(HSPs) subsequently. The AMCSP can be used to find small motion vectors efficiently while the HSPs can be used to find large ones accurately to ensure prediction quality. Simulation results showed that our proposed AMCHS achieves faster search speed,and provides better distortion performance than other popular fast search algorithms,such as CDS and CDHS. 相似文献
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An efficient adaptive approximation demosaicking algorithm based on the sampled edge pattern was presented for mosaic images from Bayer color filter array. The proposed algorithm determined edge patterns by four nearest green values surrounding the green interpolation location. Then according to the edge patterns, different adaptive interpolation steps were applied. Simulations on 12 Kodak photos and 15 IMAX high-quality images showed that the proposed method outperformed the other four demosaicking methods (bilinear, effective color interpolation, Lu’s method and Chen’s method) for average color peak signal to noise ratios and maintained a relatively low complexity owing to constant color-difference interpolation step and a reasonable terminating condition of iteration. 相似文献
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A measurement model based on torsion pendulum was established,in which nonlinear damping and nonlinear restoring force were considered.The calculation method of the moment of inertia was based on Hilbert transform.The motion of torsion pendulum showed the time-frequency characteristics due to the nonlinear factors,which were validated by the experimental data.The analytical signal was formed by Hilbert transform of the angular displacement signal of the test object.The moment of inertia can be computed by the instantaneous undamped natural frequency with Hilbert transform.Prior to the implementation of Hilbert transform,the empirical mode decomposition was used to filter the experimental signal.The moment of inertia of the test object was measured by the torsion pendulum system.The experimental results show that the relative measurement error of the moment of inertia was within 0.7%,which indicated the validity of the measurement method. 相似文献
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SAR运动参数估计是SAR成像技术研究中的一项关键技术,目前国际上普遍采用的方法是GPS INS导航系统进行运动参数估计。国内由于技术等方面的原因导航参数的估计精度远远不能满足SAR成像要求,目前只能从回波中提取平台运动参数,其中较为典型的方法是PGA、子孔径相关法等,而DCFT作为一种新的CHIRP信号参数估计方法能快速、精确的估计CHIRP信号的相关参数。本文提出利用DCFT方法估计SAR运动参数,并以此为基础对传统的RD成像算法加以改进,提出了一种基于DCFT变换的改进RD成像算法。 相似文献