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7th Annual Conference on Communication Networks and Services Research

作者： Liu Han-fei Liu Ha-yu Zhang Ting-ting Li Jing-chun Hebei Univ Technol Sch Informat Engn Tianjin 300401 Peoples R China

ISBN: (纸本)9781424441556

Signal detection in low signal to noise ratio (SNR) is widely concerned In this paper, an algorithm for weak signals detection based on cross-correlation analysis is proposed. The simulation results show that this algorithm is a fairly effective method for improving the ratios of signal to noise. Using this algorithm in radio monitoring, we can raise the sensitivity of the monitoring system and extend the regional coverage of the radio base station.

关键词： cross-correlation algorithm Weak signal detection Radio spectrum management

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The research on data processing method of the underwater micro range finder

The research on data processing method of the underwater mic...

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IEEE International Conference on Information and Automation (ICIA)

作者： Zhang Xiaojun Ma Chao Kang Chong Jiang Haibin Harbin Engn Univ Coll Sci Harbin Heilongjiang Pr Peoples R China

ISBN: (纸本)9781479913343

Range finder is an important sensing device for underwater robots to measure the height of the robot from the bottom to avoid the damage. This paper firstly took a simulation processing on the echo signal by MATLAB, verified the feasibility of the program, secondly made a detailed description about the implementation process of the cross-correlation algorithm in FPGA, and improved the reliability of the measurement by determining adaptive noise threshold.

关键词： FPGA cross-correlation algorithm Adaptive Noise Threshold

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Field Demonstration of 10-nano Static Strain Resolution Multiplexed FBG Sensor for Geophysical Applications

Field Demonstration of 10-nano Static Strain Resolution Mult...

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3rd Asia Pacific Optical Sensors Conference (APOS)

作者： Liu, Qingwen Tokunaga, Tomochika Mogi, Katsuro Matsui, Hiroya Wang, Herbert F. Kato, Teruyuki He, Zuyuan Univ Tokyo Dept Elect Engn & Informat Syst Bunkyo Ku 7-3-1 Hongo Tokyo 1138656 Japan Univ Tokyo Dept Environm Syst Chiba 2778563 Japan Japan Atom Energy Agcy Geol Isolat Res & Dev Directorate Gifu 5095102 Japan Univ Wisconsin Dept Geosci Madison WI 53706 USA Univ Tokyo Earthquake Res Inst Tokyo 1130032 Japan

ISBN: (纸本)9780819490278

We have developed an FBG sensor with a strain resolution better than 10 nano-strain (10(-8)) for geophysics applications. The sensor consists of a pair of identical FBGs, one for strain sensing and the other for reference. A narrow linewidth tunable laser is used to interrogate the two FBGs simultaneously. cross-correlation algorithm is utilized to extract the Bragg wavelength difference between the FBGs with high precision. Multiplexed sensing is achieved using WDM technique. With this sensor, the crustal deformation induced by oceanic tide at Aburatsubo Bay in Japan is clearly observed with a strain resolution better than 10 ne. This is the first that 10 ne order static strain resolution is demonstrated with FBG sensors, providing a potential tool for the geophysics applications.

关键词： FBG static strain sensing cross-correlation algorithm crustal deformation measurement

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Joint approach of the sub-holograms in on-axis lensless Fourier phase-shifting synthetic aperture digital holography

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OPTICS COMMUNICATIONS 2011年第9期284卷 2268-2272页

作者： Li, Hongyan Zhong, Liyun Ma, Zhijian Lu, Xiaoxu S China Normal Univ Sch Informat & Optoelect Sci & Engn Guangzhou 510006 Guangdong Peoples R China

In on-axis lensless Fourier phase-shifting synthetic aperture digital holography, to compose all of the phase-shifting sub-holograms to a large synthetic aperture digital hologram effectively, firstly, the cross-correlation algorithm of the object waves is presented to correct the joint misplacement of the sub-holograms. Secondly, to make the phase-shifting synchronization matching of different sequence phase-shifting holograms, the cross-correlation algorithm of the phase-shifting holograms is employed. Compared with the traditional cross-correlation algorithm of the sub-holograms, the proposed approach makes the joint precision of the sub-holograms reach sub-pixel accuracy, and the resolution of the reconstructed image is improved significantly. In general, the proposed approach is effective in restraining the quality degradation of the synthetic reconstructed image that comes from the joint misplacement of the sub-holograms and the phase-shifting non-synchronization of the phase-shifting holograms. (C) 2010 Elsevier B.V. All rights reserved.

关键词： Digital holography Phase-shifting technique Synthetic aperture technique cross-correlation algorithm

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Realization of Nano-order Static Strain Resolution in FBG Sensors Using Narrow Linewidth Tunable Laser Sources: Theoretical Analysis

Realization of Nano-order Static Strain Resolution in FBG Se...

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21st International Conference on Optical Fiber Sensors

作者： Liu, Qingwen He, Zuyuan Tokunaga, Tomochika Hotate, Kazuo Univ Tokyo Dept Elect Engn & Informat Syst Bunkyo Ku 7-3-1 Hongo Tokyo 1138656 Japan Univ Tokyo Dept Environm Syst Kashiwa Chiba 2778563 Japan

ISBN: (纸本)9780819482464

The resolution of FBG static strain sensor interrogated with a narrow linewidth tunable laser is theoretically analyzed. The main noise sources of the sensor are analyzed. The expression of the resolution is deduced with cross-correlation algorithm. The calculated resolution agrees well with previous experimental result, and the analysis is further validated by numerical simulation. Based on the deduced expression of resolution, the guidelines to optimize the sensor for realization of high resolution are given in detail. It is shown that with properly designed FBG and interrogation system, nano-order static strain resolution can be realized as we demonstrated in experiment recently.

关键词： Fiber Bragg gratings fiber optics sensors static strain resolution cross-correlation algorithm

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A Comparison of Sound Localisation Techniques using cross-correlation and Spiking Neural Networks for Mobile Robotics

A Comparison of Sound Localisation Techniques using Cross-Co...

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International Joint Conference on Neural Networks (IJCNN)

作者： Wall, Julie A. McGinnity, Thomas M. Maguire, Liam P. Univ Ulster Intelligent Syst Res Ctr Sch Comp & Intelligent Syst Coleraine BT52 1SA Londonderry North Ireland

ISBN: (纸本)9781424496365

This paper outlines the development of a cross-correlation algorithm and a spiking neural network (SNN) for sound localisation based on real sound recorded in a noisy and dynamic environment by a mobile robot. The SNN architecture aims to simulate the sound localisation ability of the mammalian auditory pathways by exploiting the binaural cue of interaural time difference (ITD). The medial superior olive was the inspiration for the SNN architecture which required the integration of an encoding layer which produced biologically realistic spike trains, a model of the bushy cells found in the cochlear nucleus and a supervised learning algorithm. The experimental results demonstrate that biologically inspired sound localisation achieved using a SNN can compare favourably to the more classical technique of cross-correlation.

关键词： correlation Delay Delay lines Ear Microphones Neurons Robots bushy cells cochlear nucleus control engineering computing correlation methods cross-correlation algorithm encoding encoding layer interaural time difference learning (artificial intelligence) mammalian auditory pathway medial superior olive mobile robotics mobile robots neural nets sound localisation ability simulation sound localisation technique spike trains spiking neural network supervised learning algorithm

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Dense-phase pneumatically conveyed coal particle velocity measurement using electrostatic probes

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JOURNAL OF ELECTROSTATICS 2010年第1期68卷 64-72页

作者： Xu, Chuanlong Zhou, Bin Wang, Shimin Southeast Univ Thermal Energy Engn Res Inst Nanjing 210096 Peoples R China

The fundamental measurement theory of an electrostatic probe and cross-correlation velocity measurement method are introduced in this paper. The effects of the probe's geometric parameters, including the length of the probe: the thickness, length and relative permittivity of the dielectric pipe;the radius of the screen on the dimensionless calibration coefficient (k), and the statistical error of the transit time (tau(m)) of the correlation velocity measurement system using electrostatic probes were investigated theoretically. Finally the measurement system was applied in a 10 mm bore horizontal section of a dense-phase pneumatic Conveying system under high pressure circulating pulverized coal over a superficial air velocity range of 0.5-7 m/s for a particle concentration 0.052-0.141 m(3)/m(3). The experimental results that were obtained demonstrate that the system is capable of providing solid particle velocity measurements with repeatability better than 10% under the given experimental conditions. (C) 2009 Elsevier B.V. All rights reserved.

关键词： Particle velocity Electrostatic probe cross-correlation algorithm Gas-solid flow Pneumatic conveying

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An Ultra-high-resolution FBG Static-strain Sensor for Geophysics Applications

An Ultra-high-resolution FBG Static-strain Sensor for Geophy...

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Fourth European Workshop on Optical Fibre Sensors

ISBN: (纸本)9780819480835

We report an ultra-high-resolution static-strain measurement with a pair of fiber Bragg gratings (FBGs), one for strain sensing and the other for compensating the error due to temperature disturbance and source drift. The difference between the two FBGs' Bragg wavelengths is evaluated by utilizing a cross-correlation algorithm. The mechanism of noise suppression by the cross-correlation algorithm is quantitatively analyzed and the factor that determines the ability of noise suppression of this algorithm is revealed. The temperature dependence is further subtracted by using a vector operation. When no strain is applied, an ultra-high wavelength resolution corresponding to 2.6 n epsilon was obtained, which gives the ultimate performance of the measurement system. With a variable strain applied with a piezo-stage, a resolution of 17.6 n epsilon was demonstrated. This is the first demonstration, to the best of our knowledge, that a real-static strain down to 10 n epsilon is measured, providing a powerful technique for the measurement in geophysics application.

关键词： Fiber Bragg grating (FBG) ultra-high resolution cross-correlation algorithm

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A Fast Critical Arrhythmic ECG Waveform Identification Method Using cross-correlation and Multiple Template Matching

A Fast Critical Arrhythmic ECG Waveform Identification Metho...

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32nd Annual International Conference of the IEEE Engineering-in-Medicine-and-Biology-Society (EMBC 10)

作者： Chin, Fook Joo Fang, Qiang Zhang, Tao Cosic, Irena RMIT Univ Sch Elect & Comp Engn Melbourne Vic Australia Chinese Acad Sci Inst Biomed Engn & Technol Beijing 100864 Peoples R China

ISBN: (纸本)9781424441242

Critical Arrhythmic ECG such as Ventricular Tachycardia (VT) and Ventricular Fibrillation (VF) are both distinguishable by its waveform characteristics. A VF waveform is often described as disorganized and has an irregular rhythm while a VT waveform exhibits abnormal signatures and presents a regular rhythm pattern. This paper presents a fast cross-correlation algorithm using multiple waveform templates for automatic detection of life threatening arrhythmias such as VT and VF from the Normal Sinus Rhythm (NSR) waveforms. A sliding-window template cross-correlation technique is applied to an ECG signal to generate an array of correlation coefficients. Then a correlation coefficient curve is used to detect high coefficient values for a type of template that will quantify the similarity between an examined ECG signal and a template. The method presented in this paper is able to detect all three different types of ECG signals from a total 21 testing signal set with a satisfied correct rate.

关键词： automatic detection correlation coefficient curve critical arrhythmic ECG waveform identification method cross-correlation algorithm electrocardiography medical disorders medical signal detection medical signal processing multiple template matching normal sinus rhythm waveforms sliding-window template cross-correlation technique ventricular fibrillation ventricular tachycardia waveform analysis

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Estimation of the correlation amplitude of RF signals in small cutaneous vessels

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IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL 2000年第6期47卷 1455-1462页

作者： Gens, F Remenieras, JP Diridollou, S Patat, F GIP Ultrasons EA 2102 F-37032 Tours France IRPF Dept Rech Evaluat & Dermocosmet F-31400 Toulouse France

Time domain correlation technique is a widely used method for blood flow velocity measurement. The time shift between a pair of windowed ultrasonic echoes is estimated by searching the temporal position of the maximum of the interpolated normalized correlation function. Between two consecutive echoes, the acoustical footprint of a group of scatterers, which are transported with the how, moves and is deformed. This implies a decreasing of the amplitude of the normalized correlation coefficient. In the case of microcirculation (low how rate, low SNR), the amplitude of the correlation peak can be used to detect the presence of blood flow and to discriminate false and true detections (reliability index). We have numerically evaluated the statistical performances of the cross-correlation algorithm used as a correlation peak amplitude estimator in severe conditions (short correlation window length, low SNR). These theoretical results have been compared with in vitro experimentation on a 100-mum-diameter microcirculatory phantom and with in vivo experimentation on a 180-mum-diameter vessel of a human leg carrying erysipelas.

关键词： biomedical ultrasonics blood flow measurement correlation methods time-domain analysis RF signals acoustical footprint blood flow velocity measurement correlation amplitude correlation peak amplitude estimator cross-correlation algorithm cutaneous vessel radio frequency signal Time domain analysis blood flow test correlation methods cross correlation Blood Flow Amplitude biomedical ultrasonics Blood Circulation low SNR

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