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	1. Investigation of a 32-lead body surface potential acquisition system: application to locate the equilibrium-point
	Fang Wensheng,Zhu Songsheng,Xu Jingyi,Xiang Wentao,Liu Bin,Li Jianqing
	Electrics, Communication and Autocontrol Technology 23 March 2020
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	Abstract:The traditional 12-lead electrocardiography (ECG) monitor system can record limited body surface potential (BSP) information at some particular area, where the cardiac state can only be roughly evaluated. In order to collect more heart information, in this study, a 32-lead BSP acquisition system is designed. The Wilson central terminal (WCT) is set as the reference electrode to obtain the BSPs at different points. To verify the proposed system, three sets of BSPs about healthy adult male are collected. By comparing the QRS complex of single cardiac cycle, an equilibrium point of BSP signal is defined (i.e. the amplitudes of R and S waves are clearly flipped) through this new system. Such equilibrium point can be a potential position index in clinical diagnosis.
	TO cite this article:Fang Wensheng,Zhu Songsheng,Xu Jingyi, et al. Investigation of a 32-lead body surface potential acquisition system: application to locate the equilibrium-point[OL].[23 March 2020] http://en.paper.edu.cn/en_releasepaper/content/4751325


	2. Multi-frequency Phase Sensitive Detection with Improved Median Filtering
	CUI Zi-Qiang, HAO Zhen-Hua, WANG Hua-Xiang
	Electrics, Communication and Autocontrol Technology 13 May 2016
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	Abstract:Multi-frequency signal detection plays an important role in bio-impedance measurement, EM induction based non-destructive test, etc. The Phase-sensitive detection (PSD) is an effective tool for discriminating the amplitude and phase of each frequency component. The phase sensitive demodulator can be viewed as a matched filter to its source signal and is the optimal linear filter when only Gaussian noise is at presence. In many real applications, however, the noise has also rather distinctive impulsive characteristics. The impulsive noise puts forward a great challenge for the multi-frequency PSD. In this paper, an approach for the reduction of impulsive noise is introduced to improve the performance of multi-frequency PSD. The proposed method is able to achieve better signal-to-noise ratio (SNR) than its linear counterparts in processing digital signal that contaminated by impulsive noise.
	TO cite this article:CUI Zi-Qiang, HAO Zhen-Hua, WANG Hua-Xiang. Multi-frequency Phase Sensitive Detection with Improved Median Filtering[OL].[13 May 2016] http://en.paper.edu.cn/en_releasepaper/content/4688108

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	3. A Localization Algorithm and its Performance Analysis for Distributed Microphone Network
	WANG Wei,LIU Yumin
	Electrics, Communication and Autocontrol Technology 26 September 2015
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	Abstract:In this paper we study on distributed microphone arrays which based on the bearing-crossing method and the optimal array placement.Firstly, we investigate the variations of localization accuracy of the signal when the arrays are placed at different positions in a particular area.Then by adjusting the distance between two microphone arrays,we can obtain a optimal distance,that in the distance a very small standard deviation of the sound localization accuracy could be obtained.
	TO cite this article:WANG Wei,LIU Yumin. A Localization Algorithm and its Performance Analysis for Distributed Microphone Network[OL].[26 September 2015] http://en.paper.edu.cn/en_releasepaper/content/4655849


	4. Signal Reconstruction of Non-uniform 3D configuration Distributed SAR Moving Target 3D Imaging Based on Compressed Sensing
	Liu Mei,Zhang Lei,Gu guanglin
	Electrics, Communication and Autocontrol Technology 28 September 2013
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	Abstract:In this paper, a distributed SAR moving targets 3D imaging method based on compressed sensing algorithm is presented. The moving target 3D signal sparse signal model is derived, and then the moving targets 3D signal reconstruction method based basis pursuit is established. In the case of low amount of data, we realize the distributed SAR moving target high-resolution 3D imaging. Finally, the simulation results verify the correctness and validity of the proposed algorithm
	TO cite this article:Liu Mei,Zhang Lei,Gu guanglin. Signal Reconstruction of Non-uniform 3D configuration Distributed SAR Moving Target 3D Imaging Based on Compressed Sensing[OL].[28 September 2013] http://en.paper.edu.cn/en_releasepaper/content/4561339


	5. Numerical Approach for the Sensitivity of High Frequency Magnetic Induction Tomography System based on Boundary Elements and Purtubation Method
	ZHAO Qian,CHEN Guang,HAO Jianna,XU Kai,YIN Wuliang
	Electrics, Communication and Autocontrol Technology 09 November 2012
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	Abstract:Magnetic induction tomography (MIT) is an imaging technique based on the measurement of the magnetic field perturbation due to eddy currents induced in conducting objects exposed to an external magnetic excitation field. In MIT, current-carrying coils are used to induce eddy currents in the object and the induced voltages are sensed with receiving coils. When the driving frequency is significantly high, metallic targets with high conductivity between the coils can be treated as perfect electric conductors (PEC) with negligible errors. In this scenario, the penetration depth of the magnetic field into the target is extremely small and Finite Elements Method (FEM) is not efficient for the calculation of the sensitivity and the forward problem due to the requirement for large number of elements to reach an acceptable computational precision. However, Boundary Element Method (BEM) based on integral formulations becomes an effective way to analyze this kind of scattering problems since meshes are only required on the surface of the object. By point collocation, the boundary integral equations can be transformed into linear equations. Then numerical method is used to solve the linear equations and the solution of the original integral equations can be obtained. In this paper, we computed four typical sensitivity maps between the coil pairs in high frequency MIT system due to a PEC perturbation. The magnetic scalar potential was used to improve the efficiency. Five PEC objects of different shapes were used in the simulation. The results have been compared with the experimental results and that obtained from the H dot H formulations. We can know that the sensitivity maps derived by BEM are in good agreement with that from experiment and theoretical solution. Overall, BEM is an effective way to calculate the sensitivity distributions of high frequency MIT system.
	TO cite this article:ZHAO Qian,CHEN Guang,HAO Jianna, et al. Numerical Approach for the Sensitivity of High Frequency Magnetic Induction Tomography System based on Boundary Elements and Purtubation Method[OL].[ 9 November 2012] http://en.paper.edu.cn/en_releasepaper/content/4494544


	6. Application of the Method of Auxiliary Source to the Sensitivity Analysis of High Frequency Magnetic Induction Tomography System
	ZHAO Qian,HAO Jianna,CHEN Guang,XU Kai,YIN Wuliang
	Electrics, Communication and Autocontrol Technology 09 November 2012
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	Abstract:Magnetic induction tomography (MIT) is an imaging technique based on the measurement of the magnetic field perturbation due to eddy currents induced in conducting objects exposed to an external magnetic excitation field. In MIT, current-carrying coils are used to induce eddy currents in the object and the induced voltages are sensed with receiving coils. When the driving frequency is significantly high, metallic targets with high conductivity between the coils can be treated as perfect electric conductors (PEC) with negligible errors. Boundary Element Method (BEM) based on integral formulations becomes an effective way to analyze this kind of scattering problems since meshes are only required on the surface of the object. But how to deal with the singular integral is a difficult issue unlikely to avoid. The method of auxiliary source (MAS) introduces the concepts of auxiliary surface and auxiliary source which avoid the computation of singular integrals. In this paper, the formula of sensitivity distribution was obtained by MAS with high efficiency and accuracy and then simulations by MATLAB were programmed. According to the good agreement of these results obtained by different numerical methods, we can know that MAS is an effective way to analyze the sensitivity distributions of high frequency MIT system.
	TO cite this article:ZHAO Qian,HAO Jianna,CHEN Guang, et al. Application of the Method of Auxiliary Source to the Sensitivity Analysis of High Frequency Magnetic Induction Tomography System[OL].[ 9 November 2012] http://en.paper.edu.cn/en_releasepaper/content/4494541


	7. A Novel Statistical Index for Image Confidence Evaluation in Electromagnetic Tomography
	HAO Jianna,ZHAO Qian,CHEN Guang,XU Kai,YIN Wuliang
	Electrics, Communication and Autocontrol Technology 09 November 2012
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	Abstract:For Electromagnetic Tomography (EMT) Techniques, image reconstruction is one of the crucial steps. For previous works, two criteria, namely the relative image error and correlation coefficient, were often used to evaluate reconstruction quality, but the measurement uncertainty, which exists in the process of obtaining inductance measurements and sensitivity maps, wasn't taken into account. In this paper, a statistical index was proposed for the first time to quantitatively evaluate the image confidence level for each pixel of the reconstructed image through error propagation analysis.
	TO cite this article:HAO Jianna,ZHAO Qian,CHEN Guang, et al. A Novel Statistical Index for Image Confidence Evaluation in Electromagnetic Tomography[OL].[ 9 November 2012] http://en.paper.edu.cn/en_releasepaper/content/4494538


	8. Research on Modelling and Simulation Technique for the new type Land-based Radio Navigation System
	Fang Ling,,Liu Jianye,Lai JiZhou,Wang kai
	Electrics, Communication and Autocontrol Technology 21 January 2011
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	Abstract:For more safety, capacity and efficiency of the current navigation system in the future air transport, the concept of the Future Air Navigation Systems (FANS) is presented. The benefits of new navigation system also put forward higher requirements on the navigation system which the traditional land-based radio navigation system cannot satisfy. As the land-based radio navigation system has the characteristics of low cost, it is meaningful to upgrade and transform the traditional land-based navigation system to adapt to the Future Air Navigation Systems. This paper presented a new type of modelling and simulation technique for the new type land-based radio navigation system that uses spread spectrum technology, so that the accuracy of land-based system can be improved to reach the necessary requirements. Finally, the navigation process was simulated. Compared with the traditional land-based radio navigation, the result of this simulation reflect higher accuracy and better navigation algorithm.
	TO cite this article:Fang Ling,,Liu Jianye,Lai JiZhou, et al. Research on Modelling and Simulation Technique for the new type Land-based Radio Navigation System[OL].[21 January 2011] http://en.paper.edu.cn/en_releasepaper/content/4408163


	9. High Resolution Ranging Method Based on Low-Rate Parallel Random Sampling
	Lin Jie,Shi Guangming,Chen Xuyang,Qi Fei,Zhang Li
	Electrics, Communication and Autocontrol Technology 27 May 2010
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	Abstract:In this paper, we propose a low-rate high-resolution ranging method for UWB (up to several GHz of sampling rate) ranging system. It exploits compressed sensing (CS) theory and a parallel sampling ADCs structure based on random projection (PSRP). To guarantee the effective application of CS on the received signal, we construct a dictionary in which the atoms are time-shifted versions of the transmitted signal. Hence the received signal can be low-rate sampled by PSRP. For an UWB ranging system using PSRP instead of the newly pro- posed analog-to-information converter, it possesses the universality of dictionary atoms, lower sampling rate and better performance for noisy signal. Addition- ally, since the dictionary size in this work can be adjusted flexibly, a desired high resolution can be achieved. The simulation results confirm these advantages via a noisy received signal (SNR=16dB) which contains five target echoes. Though the received signal is sampled at less 10% of Nyquist rate, the probability of echo detection is over 95% and the distance resolution reaches the optimal of the conventional ranging method.
	TO cite this article:Lin Jie,Shi Guangming,Chen Xuyang, et al. High Resolution Ranging Method Based on Low-Rate Parallel Random Sampling[OL].[27 May 2010] http://en.paper.edu.cn/en_releasepaper/content/4374120


	10. Signal Matching Wavelet for Ultrasonic Flaw Detection in High Background Noise
	Shi Guangming,Chen Xuyang,Song Xiaoxia,Qi Fei,Ding Ailing
	Electrics, Communication and Autocontrol Technology 25 May 2010
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	Abstract:It is very important to detect the flaw echoes for ultrasonic nondestructive evaluation in high background noise. The existing methods based on wavelet transform (WT) mainly use a wavelet basis to match a signal. As is well known, there are dozens of wavelet modes in all, whereas the signal may appear in various forms in practical application. Then the optimal match between the wavelet basis and the signal is difficult to be generated due to the constraints of wavelet. In this paper we propose a method of signal matching wavelet (SMW) for ultrasonic flaw detection in high background noise. In SMW the transmitted signal is designed to be a wavelet mode for matching a wavelet basis. Since our method gets rid of the constraints of wavelet, the optimal match between the echo signal and a wavelet basis is easy to be achieved. And we analyze the energy distribution of ultrasonic signal and propose the energy matching criteria to design the transmitted signal, which guarantees the optimal match. Furthermore, we put forward a scheme for choosing system parameters and the parameter of transmitted signal to enhance the matching capacity. In addition, a low-rate equivalent discrete WT (DWT) structure based on polyphase decomposition is designed to reduce the hardware cost and farther facilitate practical application. Finally the simulative results show that SMW can efficiently detect the flaw under high background noise even for the SNR low to -20 dB, which cannot be obtained by using other methods to our best knowledge.
	TO cite this article:Shi Guangming,Chen Xuyang,Song Xiaoxia, et al. Signal Matching Wavelet for Ultrasonic Flaw Detection in High Background Noise[OL].[25 May 2010] http://en.paper.edu.cn/en_releasepaper/content/4373752

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