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IEEE International Conference on Radar

作者： Xin Chang Yanbin Li Yan Zhao Yufeng Du Donghui Liu Jun Wan Electronics Technology Group Corporation (CETC54) Hebei Key Laboratory of Electromagnetic Spectrum Cognition and Control The 54th Research Institute of China Shijiazhuang China Electronics Technology Group The 54th Research Institute of China Corporation (CETC54) Shijiazhuang China School of Economics and Management Shijiazhuang Tiedao University Shijiazhuang China Chongqing Key Laboratory of Space Information Network and Intelligent School of Microelectronics and Communication Engineering Chongqing University Information Fusion Chongqing University Chongqing China

ISBN: (纸本)9781665468893

To reduce difficulty of obtaining jamming parameters, combining scattered wave deception jamming method structure with genetic algorithm, a scattered wave deceptive jamming method based on genetic algorithm is proposed against three Channel SAR GMTI. Four-dimensional jamming parameter searching problem is separated as a one-dimensional optimization problem and a two-dimensional optimization problem, which will reduce computational burden and jamming parameter acquirement time and raise fidelity of deceptive jamming. In addition, the problem, that tolerance of Doppler rate mismatch is difficult to describe, is solved by transforming an objective function of the two-dimensional optimization problem. By utilizing jamming quality parameters, simulation experiments are provided to verify the effectiveness of SGA method against the three-channel SAR GMTI.

关键词： Azimuth Computational modeling Radar antennas Search problems Linear programming Doppler effect Jamming

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10 GHz Robust polarization modulation towards high-speed satellite-based quantum communication

arXiv

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arXiv 2024年

作者： Wang, Zexu Xu, Huaxing Li, Ju Huang, Jinquan Han, Hui Wang, Changlei Zhang, Ping Yin, Feifei Xu, Kun Liu, Bo Dai, Yitang State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications Beijing100876 China National Engineering Research Center for Public Safety Risk Perception and Control by Big Data China Academy of Electronics and Information Technology Beijing100041 China CETC Academy of Electronics and Information Technology Group Co. Ltd. Beijing100041 China College of Advanced Interdisciplinary Studies National University of Defense Technology Changsha410073 China School of Electronics and Communication Engineering Sun Yat-sen University Guangdong Shenzhen518107 China College of Computer National University of Defense Technology Changsha4100730 China

In practical satellite-based quantum key distribution (QKD) systems, the preparation and transmission of polarization-encoding photons suffer from complex environmental effects and high channel-loss. Consequently, the hinge to enhancing the secure key rate (SKR) lies in achieving robust, low-error and high-speed polarization modulation. Although the schemes that realize self-compensation exhibit remarkable robustness. Their modulation speed is constrained to approximately 2 GHz to avoid the interaction between the electrical signal and the reverse optical pulses. Here we utilize the non-reciprocity of the lithium niobate modulators and eliminate the modulation on the reverse optical pulses. As this characteristic is widely available in the radio-frequency band, the modulation speed is no longer limited by the self-compensating optics and can be further increased. The measured average intrinsic QBER of the different polarization states at 10 GHz system repetition frequency is as low as 0.53% over 10 min without any compensation. And the experiment simulation shows that the proposed scheme extends the transmission distance to more than 350 km. Our work can be be efficient performed to the high-speed and high-loss satellite-based quantum communication scenario. © 2024, CC BY.

关键词： Quantum communication

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Room temperature continuous-wave excited biexciton emission in CsPbBr3 nanocrystals

arXiv

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arXiv 2018年

作者： Chen, Jie Zhang, Qing Du, Wenna Mi, Yang Shang, Qiuyu Shi, Jia Liu, Pengchong Sui, Xinyu Wu, Xianxin Wang, Rui Peng, Bo Zhong, Haizheng Xing, Guichuan Qiu, Xiaohui Sum, Tze Chien Liu, Xinfeng Division of Nanophotonics CAS Key Laboratory of Standardization and Measurement for Nanotechnology CAS Center for Excellence in Nanoscience National Center for Nanoscience and Technology Beijing100190 China University of Chinese Academy of Sciences 19 A Yuquan Rd Shijingshan District Beijing100049 China Department of Materials Science and Engineering College of Engineering Peking University Beijing100871 China Research Center for Wide Band Semiconductor Peking University China National Engineering Research Center of Electromagnetic Radiation Control Materials State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of China Beijing Key Laboratory of Nanophotonics and Ultrafine Optoelectronic Systems School of Materials Science & Engineering Beijing Institute of Technology China Institute of Applied Physics and Materials Engineering University of Macau China School of Physical & Mathematical Sciences Nanyang Technological University 21 Nanyang Link Singapore

Biexcitons are a manifestation of many-body excitonic interactions crucial for quantum information and quantum computation in the construction of coherent combinations of quantum states. However, due to their small binding energy and low transition efficiency, most biexcitons in conventional semiconductors exist either at cryogenic temperature or under femtosecond pulse laser excitation. Here we demonstrate room temperature, continuous wave driven biexciton states in CsPbBr3 perovskite nanocrystals through coupling with a plasmonic nanogap. The room temperature CsPbBr3 biexciton excitation fluence (~100 mW/cm2) is reduced by ~1013 times in the Ag nanowire-film nanogaps. The giant enhancement of biexciton emission is driven by coherent biexciton-plasmon Fano interference. These results provide new pathways to develop high efficiency non-blinking single photon sources, entangled light sources and lasers based on biexciton states. Copyright © 2018, The Authors. All rights reserved.

关键词： Cesium compounds

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Seismic Interpolation Transformer for Consecutively Missing Data: A Case Study in DAS-VSP Data

arXiv

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arXiv 2024年

作者： Cheng, Ming Lin, Jun Dong, Xintong Lu, Shaoping Zhong, Tie College of Instrumentation and Electrical Engineering Jilin University Jilin Changchun130026 China School of Earth Sciences and Engineering Sun Yat-Sen University Guangdong Guangzhou510275 China Guangdong Zhuhai519000 China Guangdong Provincial Key Lab of Geodynamics and Geohazards Sun Yat-sen University Guangdong Guangzhou510275 China Key Laboratory of Modern Power System Simulation and Control and Renewable Energy Technology Ministry of Education Jilin132012 China Department of Communication Engineering College of Electric Engineering Northeast Electric Power University Jilin132012 China

Distributed optical fiber acoustic sensing (DAS) is a rapidly-developed seismic acquisition technology with advantages of low cost, high resolution, high sensitivity, and small interval, etc. Nonetheless, consecutively missing cases often appear in real seismic data acquired by DAS system due to some factors, including optical fiber damage and inferior coupling between cable and well. Recently, some deep-learning seismic interpolation methods based on convolutional neural network (CNN) have shown impressive performance in regular and random missing cases but still remain the consecutively missing case as a challenging task. The main reason is that the weight sharing makes it difficult for CNN to capture enough comprehensive features. In this paper, we propose a transformer-based interpolation method, called seismic interpolation transformer (SIT), to deal with the consecutively missing case. This proposed SIT is an encoder-decoder structure connected by some U-shaped swin-transformer blocks. In encoder and decoder part, the multi-head self-attention (MSA) mechanism is used to capture global features which is essential for the reconstruction of consecutively missing traces. The U-shaped swin-transformer blocks are utilized to perform feature extraction operations on feature maps with different resolutions. Moreover, we combine the loss based on structural similarity index (SSIM) and L1 norm to propose a novel loss function for SIT. In experiments, this proposed SIT outperforms U-Net and swin-transformer. Moreover, ablation studies also demonstrate the advantages of new network architecture and loss function. Copyright © 2024, The Authors. All rights reserved.

关键词： Optical fibers

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Detecting Submicron-Scale Continuous Variation in Phase of AC Magnetic Field Around Micro-Circuit With Diamond Quantum Sensor

Detecting Submicron-Scale Continuous Variation in Phase of A...

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Pacific Rim Conference on Lasers and Electro-Optics (CLEO/Pacific Rim)

作者： Fuki Otsubo Takumi Mikawa Yuichiro Matsuzaki Norio Tokuda Norikazu Mizuochi Junko Ishi-Hayase School of Fundamental Science and Technology Keio University Kanagawa Japan Center for Spintronics Research Network Keio University Kanagawa Japan Department of Electrical Electronic and Communication Engineering Faculty of Science and Engineering Chuo University Tokyo Japan Nanomaterials Research Institute Kanazawa University Ishikawa Japan Institute for Chemical Research Kyoto University Kyoto Japan Center for Spintronics Research Network Kyoto University Kyoto Japan International Center for Quantum-field Measurement System for Studies of the Universe and Particles High Energy Accelerator Research Organization Ibaraki Japan

Magnetic field distribution is significant information for LSI failure analysis. In this study, we detected continuous change in phase of AC magnetic field as well as amplitude utilizing RF -dressed states of electron... 详细信息

ISBN: (数字)9798350372076

ISBN: (纸本)9798350372083

关键词： Radio frequency Failure analysis Diamonds Lasers and electrooptics Large scale integration Magnetic fields Quantum sensing

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Optical measurements of rat muscle samples under treatment with ethylene glycol and glucose

Optical measurements of rat muscle samples under treatment w...

引用

作者： Oliveira, Luís Carvalho, Maria Inês Nogueira, Elisabete Tuchin, Valery V. Physics Department-Polytechnic of Porto School of Engineering Rua Dr. António Bernardino de Almeida 431 4200-072 Porto Portugal University of Porto Rua Dr. Roberto Frias 4200-465 Porto Portugal CIETI-Centre of Innovation in Engineering and Industrial Technology ISEP Rua Dr. António Bernardino de Almeida 431 4200-072 Porto Portugal DEEC/FEUP and INESC TEC University of Porto Rua Dr. Roberto Frias 4200-465 Porto Portugal Research-Educational Institute of Optics and Biophotonics Saratov State University 83 Astrakhanskaya Str. Saratov 410012 Russia Laboratory of Laser Diagnostics of Technical and Living Systems Institute of Precise Mechanics and Control RAS Saratov 410028 Russia Optoelectronics and Measurement Techniques Laboratory University of Oulu P. O. Box 4500 FIN-90014 Oulu Finland

With the objective to study the variation of optical properties of rat muscle during optical clearing, we have performed a set of optical measurements from that kind of tissue. The measurements performed were total transmittance, collimated transmittance, specular reflectance and total reflectance. This set of measurements is sufficient to determine diffuse reflectance and absorbance of the sample, also necessary to estimate the optical properties. All the performed measurements and calculated quantities will be used later in inverse Monte Carlo (IMC) simulations to determine the evolution of the optical properties of muscle during treatments with ethylene glycol and glucose. The results obtained with the measurements already provide some information about the optical clearing treatments applied to the muscle and translate the mechanisms of turning the tissue more transparent and sequence of regimes of optical clearing. © The Authors.

关键词： Optical data processing

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Modulation Recognition of Composite Signal Based on ResNet and Frequency Domain Graph

引用

Journal of Physics: Conference Series 2021年第1期2025卷

作者： Lijun Wang Yu Han Hongfang Ge Yongkuan Zhao Lei Shen Science and Technology on Communication Information Security Control Laboratory Jiaxing China The 36th Research Institute of China Electronics Technology Group Corporation Jiaxing China School of Communication Engineering Hangzhou Dianzi University Hangzhou China

Aiming at the problem of composite signal recognition in measurement and control system, a modulation recognition method of composite signal is proposed based on clipped internal modulation signal frequency image and residual network. Residual network has the advantages of fast convergence and high recognition accuracy, which is used to realize the recognition of different modulation modes and different bandwidth signals. The experimental results show that, compared with the traditional decision tree algorithm and the constellation based CNN recognition algorithm, the recognition performance of the proposed method is improved by more than 3dB for the variable bandwidth composite modulation signal set (BPSK-FM and QPSK-FM with internal modulation bandwidth of 128kHz, BPSK-FM and QPSK-FM with internal modulation bandwidth of 2kHz and 2FSK-FM with internal modulation bandwidth of 32kHz and 2kHz).

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Character distingwishing of distilled spirits with optical method

引用

Guangdianzi Jiguang/Journal of Optoelectronics Laser 2006年第SUPPL.期17卷 375-377页

作者： Zhu, Tuo Xu, Yan Gu, En-Dong Yu, Rui-Peng Zhang, Yi-Xin Chen, Guo-Qing Li, Xiao-Wu School of Science Southern Yangtze University Wuxi 214122 China School of Communication and Control Engineering Southern Yangtze University Wuxi 214122 China Testing Center Southern Yangtze University Wuxi 214136 China School of Bioengineering Southern Yangtze University Wuxi 214136 China Nanjing University of Science and Technology Nanjing 210094 China

The application of fluorescent spectrometry in quality detection and brand identification of fermentation food was studied. Three brands of stronger alcohol with a fragrant flavor (Gujing ju, Luzhoujiao ju, Shuanggou daqu) which come from different regions were compared in study of spectroscopy. We had detected each fluorescence spectra of different brands which were prompted by the UV-light with different wavelength and excited by the UV-light with same wavelength. The experimental results indicate that each alcohol has its owner fluorescence spectra, even excited by the UV-light with same wavelengh, each alcohol has different fluorescence spectra.

关键词： Alcohols

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Design and on-body evaluations of a low-cost wearable PIFA for on-body applications

引用

IOP Conference Series: Materials Science and engineering 2020年第1期767卷

作者： Azadeh Ahmadihaji Hadi Aliakbarian Nordiana Mohamad Saaid Ping Jack Soh The Wireless Terminals Measurement Lab K.N. Toosi University of Technology Iran. School of Computer and Communication Engineering Universiti Malaysia Perlis 02600 Arau Perlis Malaysia.

A flexible low profile textile antenna based on planar inverted-F antenna (PIFA) structure is presented in this paper. This topology has been chosen due to its design simplicity, relatively large bandwidth and the existence of a full rear ground plane, which shields against the effects of the body. The antenna topology which is designed on a 4 mm-thick felt substrate is presented. Conductive textile (Aaronia-shield) is applied as the antenna's radiator and ground plane due to its light weight, low surface resistance and good conductivity. The antenna performance in free space and bent conditions in the proximity of human body are studied, followed by a numerical investigation on the influence of relative humidity on the textile antenna performance. The fabricated PIFA is assessed experimentally and is found to be in good agreements with the simulation results. Finally, the antenna is attached to a compact RF module and is evaluated on body in a practical environment. The wireless link quality is also evaluated in an indoor laboratory environment.

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Design of Low-cost Position Differential Positioning System Based on STM32

Design of Low-cost Position Differential Positioning System ...

引用

Chinese Automation Congress

作者： Haijun Fu Ming Qiu Xisong Dong Gang Xiong Haonan Xiong Xiang Su Shichao Chen Zhen Shen Xiujiang Guo School of Artificial Intelligence Beijing Union University Beijing China The Cloud Computing Center Chinese Academy of Sciences Dongguan China The Qingdao Academy of Intelligent Industries Macau University of Science and Technology Qingdao China Beijing Union University Beijing China School of Electrical Engineering and Electronic Information Xihua University Chengdu China The State Key Laboratory for Management and Control of Complex Systems Chinese Academy of Sciences Beijing China The Beijing Engineering Research Center of Intelligent Systems and Technology Chinese Academy of Sciences Beijing China Department of Computer Science University of Helsinki Fin Finland Measurement Center Station PetroChina Huabei Oilfield Company Renqiu China

There exist some obstacles to realize high-precision positioning with using the position differential technique due to the limiting factors. However, with the advancement of chip performance and the establishment of multiple satellite navigation systems, position differential positioning can be realized to meet the civilian high-precision positioning demand while significantly reducing costs. This paper is to explore the engineering application and propose a new method. Through the experiments and data analysis, we have found the error correlation between two receivers in a small area and designed a set of positioning system, and programmed in the Keil μVision5 in C language. The system consists of the current mainstream low-cost STM32, UBLOX NEO 6M chip, NRF24L01 chip, GPS antenna and power supply module. Each two receivers can form a differential positioning system. At present, the system in the low-speed status is, in the urban environment, basically reaching within 0.5 - 3 m of the positioning error.

关键词： Position differential positioning Low cost Error correlation GPS STM32

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