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Signal, Information and Data Processing (ICSIDP), IEEE International Conference on

作者： Wenhao Ma Mingchen Yuan Xinyang Wang Liang Zhang Yanhua Wang Radar Technology Research Institute Beijing Institute of Technology Beijing China Zhengzhou Research Institute Beijing Institute of Technology Zhengzhou China Xi'an Modern Control Technology Research Institute Xi'an China Electromagnetic Sensing Research Center of CEMEE State Key Laboratory Beijing Institute of Technology Beijing China Beijing Key Laboratory of Embedded•Real-Time Information: Processing Technology Beijing China Beijing Institute of Technology Chongqing Innovation Center Chongqing China Advanced Technology Research Institute Beijing Institute of Technology Jinan China

ISBN: (数字)9798331515669

ISBN: (纸本)9798331515676

In radar ground stationary or slow-moving target detection, the target detection algorithm based on High-Resolution Range Profile (HRRP) is an important technical approach. Traditional target detection algorithms based on HRRP are difficult to apply in target detection tasks under multiple terrains. To this end, this paper proposes a feature detection algorithm based on deep learning for target polarized HRRP. This paper studies an end-to-end target detection algorithm based on prototypical networks. This algorithm utilizes prototypical networks to extract deep features from input HRRP and constructs the feature distribution of clutter. Then, it calculates the distance between the features of the input test sample and the clutter feature center, and compares it with the threshold calculated based on the false alarm probability to complete the detection. Under the backgrounds of bare soil and highway, the algorithm improves by 22% compared to the traditional energy detection algorithm for two types of vehicle targets at a signal-to-clutter ratio (SCR) of 0dB.

关键词： Road transportation Radar detection Object detection Radar Soil Probability Feature extraction Classification algorithms Clutter Signal to noise ratio

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Research on the planar-coil linear time grating

Research on the planar-coil linear time grating

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19th International Conference of Fluid Power and Mechatronic Control Engineering 2018

作者： Zhang, Rui Wu, Liang Peng, Donglin Liu, Yang Peng, Lingli Chongqing Key Laboratory of Time Grating Sensing and Advanced Testing Technology Chongqing University of Technology Chongqing China

This article proposes a planar-coil linear time grating displacement sensor. Compared with the existing magnetic field-type linear time grating, the structure without tooth and slot improves the velocity uniformity of travelling wave magnetic field and the measurement accuracy can be greatly improved. The two-phase excitation coils are arranged to form a plane coil array, and the travelling wave magnetic field is generated after the two-phase orthogonal signals are entered, respectively. Then, the electric travelling wave signal is induced by the pickup coils, and the displacement is obtained after processing. The signal processing circuit is designed to amplify and filter the electric travelling wave signal, and the accuracy experiment is carried out. Result shows that in the range of 240 mm (full-scale), the measurement accuracy can achieve ±0.8 μm. © 2019 Institution of Engineering and technology. All rights reserved.

关键词： Magnetic fields

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An integrated linear time-grating displacement sensor with single alternating light field 10

An integrated linear time-grating displacement sensor with s...

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10th International Symposium on Precision Engineering Measurements and Instrumentation, ISPEMI 2018

作者： Li, Changli Fu, Min Zhu, Ge Pu, Zhiwei Yu, Xiaoyu Zhang, Shuangya College of Mechanical Engineering Chongqing University of Technology Chongqing400054 China Engineering Research Center of Mechanical Testing Technology and Equipment Ministry of Education Chongqing Key Laboratory of Time-Grating Sensing and Advanced Testing Technology Chongqing University of Technology Chongqing400054 China

ISBN: (数字)9781510627826

ISBN: (纸本)9781510627819

It is difficult to control consistency of light source and large volume in current linear time-grating displacement sensor with four-channel alternating light field. A novel integrated linear time-grating displacement measurement system with single alternating light field is proposed. Single alternating light field and micro-controlling phase-shift method are used to synthesize a signal of traveling wave. And the measurement of linear displacement is achieved by measuring a difference of zero-crossing time between a signal of traveling wave and a reference signal. Design of structural miniaturization, design of integrated circuit, design of transmitting surface of cosine and design of optimization of existing time-grating displacement sensor are analyzed in detail. According to measuring principle, manufacture of light source and photoelectric receiver are completed, and corresponding experimental platform is built. Experimental results indicate that the measuring errors of optimized sensor are reached within±0.2μm using grating pitch of 0.1mm in the measuring range of 100mm. © 2019 SPIE.

关键词： Light sources

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Simultaneous Measurement and Simulation of Angular Position and Angular Speed for time grating

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Journal of Physics: Conference Series 2020年第1期1637卷

作者： Zhonghua Gao Pengxia Li Jialuo Wan Engineering Research Center of Mechanical Testing Technology and Equipment (Ministry of Education) Chongqing University of Technology 69 Hongguang Road Ba Nan District Chongqing 400054 P. R. China Chongqing Key Laboratory of Time Grating Sensing and Advanced Testing Technology Chongqing University of Technology 69 Hongguang Road Ba Nan District Chongqing 400054 P. R. China

A method is presented in order to realize the measurement of angular position and angular speed simultaneously based on the theory of time grating and the measurement of angular position and angular speed is transformed into the measurement of phase difference. Four orthogonal excitation signals are generated by the internal phase-locked loop module of FPGA. The excitation signals are superposed and input to the stator sensor. At this time, the rotation of the motor causes the rotation of the rotor sensor to generate the induction signal. The phase difference of the two signals will be obtained by the input comparison circuit of the induction signal and the excitation signal. The phase difference will be processed in FPGA, and finally the angular position and angular speed values will be obtained. The simulation results show that the method is feasible. The experimental results show that the accuracy error of angular position measurement can reach ±3', and the measurement speed stability can reach 3rpm(3%o) when the angular speed is 1000rpm.

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Software development of corneal endothelial cell analyzer 2

Software development of corneal endothelial cell analyzer

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2nd International Conference on Materials, Transportation and Environmental Engineering, CMTEE 2014

作者： Yu, Cheng Bo Dan, Xiao Ke, Yan Hong Yang, Yi Ju Lei, Liu Yuan, Yang Yu Chongqing University of Technology Chongqing China Time Grating Sensor and Advanced Detection Technology Key Laboratory Chongqing China

ISBN: (纸本)9783038352488

Based on the current development of corneal endothelial cells in the domestic, this paper developed corneal endothelial cell analyzer software system which taken Microsoft Visual Studio as development platform in Windows7 system and combined with MATLAB image processing technology and the Access database information management technology. The software relies on a database established patient archiving and query system, by VC + + statically call the dynamic link library that MATLAB Compiler generated to complete image processing, by partial equilibrium approach for image enhancement, by dynamic difference method for determination threshold when binaries. The software provides good interactive interface and graphics display surface, but also sets aside network port as follow-platform extension. © (2014) Trans Tech Publications, Switzerland.

关键词： Image enhancement

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Study of segmentation algorithm based on corneal endothelial cell images 2

Study of segmentation algorithm based on corneal endothelial...

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2nd International Conference on Materials, Transportation and Environmental Engineering, CMTEE 2014

作者： Yang, Ru Min Wang, Shuai Yu, Cheng Bo Hu, Jing Jing Yang, Yi Ju Remote Test and Control Institute Chongqing University of Technology Chongqing China Time grating sensor and advanced detection technology City key Laboratory of Chongqing Chongqing China

ISBN: (纸本)9783038352488

In this paper, we study an an algorithm for accurately extracting the outline of Corneal Endothelial Cell images according to the structure and feature of the corneal endothelial cells. Firstly, we reduce the influence of uneven exposure to segmentation effect using histogram equalization. Secondly, reduce the image noise by Gaussian filtering. At last, research the classical algorithm of image segmentation through the contrast experiment and then select a simple and effective local NiBlack dynamic threshold algorithm. The experimental result shows that this processing method is not only simple, but also can segment the corneal endothelial cell images clearly, and provides a good foundation of data for accurate identification of the following images. © (2014) Trans Tech Publications, Switzerland.

关键词： Image segmentation

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Image processing and analysis system for corneal endothelial cell based on labVIEW and MATLAB

Image processing and analysis system for corneal endothelial...

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2014 International Conference on Manufacturing technology and Electronics Applications, ICMTEA 2014

作者： Yu, Cheng Bo Ke, Yan Hong Xiao, Dan Yuan, Yang Yu Yang, Yi Ju Remote Test and Control Institute Chongqing University of Technology Chongqing China Time grating sensor and advanced detection technology City key Laboratory of Chongqing China

ISBN: (纸本)9783038353287

To process corneal endothelial cell image quickly and efficiently, observe the corneal endothelial cell form and relevant calculation and analysis. This system adopts mixed programming of LabVIEW and MATLAB, to have image processing and analysis of the corneal endothelial cell. Use LabVIEW to design operation and display interface, and send the images collected to MATLAB for complex arithmetical operation, then put out data in LabVIEW. The experiment indicates the system has the advantage of intuitive interface, convenient operation, and quick arithmetic, has the practical reference value. © (2014) Trans Tech Publications, Switzerland.

关键词： MATLAB

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A converged UWB and multi-level wired signal transport scheme in WDM-PON network

A converged UWB and multi-level wired signal transport schem...

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Asia Communications and Photonics Conference, ACPC 2014

作者： Ma, Huan Wang, Fei Wang, Weibin School of optoelectronic information Chongqing University of Technology Chongqing400054 China Chongqing Key Laboratory of Time Grating Sensing and Advanced Testing Technology Chongqing400054 China

Simultaneously transport ultra-wideband (UWB) and multi-level wired signal over a single wavelength in wavelength-division multiplexing passive optical network (WDM-PON) is proposed to improve spectrum efficiency and ... 详细信息

ISBN: (纸本)9781557528520

关键词： Passive optical networks

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A novel UWB-over-fiber upstream transmission scheme in WDM-PON network

A novel UWB-over-fiber upstream transmission scheme in WDM-P...

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Asia Communications and Photonics Conference, ACPC 2014

作者： Wang, Fei Ma, Huan Wang, Weibin School of optoelectronic information Chongqing University of Technology Chongqing400054 China Chongqing Key Laboratory of Time Grating Sensing and Advanced Testing Technology Chongqing400054 China

We proposed a novel UWB-over-fiber upstream transmission scheme using a directly-modulated RSOA in a WDM-PON network. Due to nonlinear modulation response of the RSOA, optical UWB monocycle and doublet signal can be c... 详细信息

ISBN: (纸本)9781557528520

关键词： Passive optical networks

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Theoretical model and error analysis of nanometer time grating displacement sensor

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Yi Qi Yi Biao Xue Bao/Chinese Journal of Scientific Instrument 2014年第5期35卷 1136-1142页

作者： Liu, Xiaokang Peng, Kai Wang, Xianquan Zhu, Ge Engineering Research Center of Mechanical Testing Technology and Equipment Chongqing Key Laboratory of Time-Grating Sensing and Advanced Testing Technology Chongqing University of Technology Chongqing 400054 China The State Key Laboratory of Mechanical Transmission Chongqing University Chongqing 400044 China

Nanometer displacement measurement technology and corresponding devices are served as the eye for fabricating machinery to realize nanometer precision positioning and control. However, current measuring methods with nanometer precision are difficult to balance the wide measuring range and measuring precision. Therefore, a new method using standing waves based on alternating electrical field to compose electrical travelling wave is proposed and a novel nanometer time grating displacement sensor is presented. The operation principle of nanometer time grating is presented in details. The expressions of the travelling wave modulated by 4 channel displacement information are established. The measuring error characteristics are analyzed through the theoretical deduction of the expressions for the cases of two channel standing waves with unequal amplitudes, single channel standing wave with unequal positive and negative amplitudes, and the standing wave with high order harmonic components. Based on above, lots of experiments were conducted;the results prove the correctness of the theoretical analysis. According to the theoretical analysis and experiment result, the reasons that cause the first order, the second order and the fourth order errors of nanometer time grating are clarified, based on which the structure and parameters of the nanometer time grating sensor are optimized;and finally, the accuracy of the sensor reaches ±300 nm within the measurement range of 200 mm.

关键词： Capacitive sensors

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