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2024 Asia Communications and Photonics Conference, ACP 2024 and International Conference on information Photonics and optical Communications, IPOC 2024

作者： Pan, Yan Li, Yang Wu, Mingze Zhang, Yichen Wang, Heng Huang, Wei Shao, Yun Xu, Bingjie Liu, Jinlu National Key Laboratory of Security Communication Institute of Southwestern Communication Chengdu610041 China State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications Beijing100876 China CAS Key Laboratory of Quantum Information University of Science and Technology of China Hefei230026 China

We first experimentally demonstrated discrete-modulated continuous-variable quantum key distribution over 100.93 km of standard single-mode fiber using probabilistic shaped 16QAM. The results show that a secret key ra... 详细信息

ISBN: (纸本)9798350379266

关键词： Single mode fibers

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General Simultaneous Localization and Mapping Scheme for mmWave Communication Systems

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IEEE Internet of Things Journal 2024年第12期11卷 22521-22536页

作者： Du, Tao Yang, Jie Wen, Chao-Kai Xia, Shuqiang Jin, Shi Southeast University National Mobile Communications Research Laboratory Nanjing210096 China Southeast University Key Laboratory Of Measurement And Control Of Complex Systems Of Engineering Ministry Of Education The Frontiers Science Center For Mobile Information Communication And Security Nanjing210096 China Institute Of Communications Engineering National Sun Yat-sen University Kaohsiung80424 Taiwan Zte Corporation The State Key Laboratory Of Mobile Network And Mobile Multimedia Technology Shenzhen518055 China Southeast University National Mobile Communications Research Laboratory The Frontiers Science Center For Mobile Information Communication And Security Nanjing210096 China

Utilizing high-resolution antenna arrays and wide bandwidth of the millimeter-wave (mmWave) spectrum in 5G new radio (NR) mmWave communication systems holds the potential for high-throughput data transmission while enabling user localization and environmental mapping. However, the majority of existing simultaneous localization and mapping (SLAM) algorithms rely on methods akin to the extended Kalman filter for generating initial map features. These methods prove ineffective when the measurement dimension is insufficient. Furthermore, there is a notable absence of research exploring mmWave prototype systems to evaluate and compare the performance and viability of various SLAM algorithms. To address these challenges, we propose an innovative probability hypothesis density (PHD) generation scheme for birth events and have developed a prototype system. Our approach, referred to as PHD-SLAM, exhibits remarkable effectiveness even in scenarios where the measurement dimension falls short of map features. This means it can function seamlessly with only delay or angle information available. Additionally, we have designed a 28GHz mmWave beam scanning prototype system that leverages the 5G NR frame for accomplishing SLAM algorithms. Following this, we conducted extensive simulations and experimental evaluations to gauge the performance of several leading-edge SLAM algorithms under diverse mmWave circumstances, encompassing PHD-based and belief propagation (BP) SLAM algorithms. Our analysis reveals that both PHD and BP SLAM can achieve agent localization precision within a decimeter and mapping precision within a meter, capitalizing on the angle parameters of mmWave signals. While BP SLAM showcases reduced computational demand, its estimation precision is marginally inferior to that of PHD-SLAM. © 2014 IEEE.

关键词： Belief propagation

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A Low-loss X-band Frequency-Selective Rasorber 7

A Low-loss X-band Frequency-Selective Rasorber

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7th IEEE International Conference on electronic information and Communication technology, ICEICT 2024

作者： He, Fan Hao, Wenyu Ji, Xiao China Ship Development and Design Center National Key Laboratory of Electromagnetic Effect and Security on Marine Equipment WuHan China Huazhong University of Science and Technology School of Optical and Electronic Information Wuhan China

ISBN: (纸本)9798350384437

This paper proposes a wideband and low insertion loss frequency-selective Rasorber (FSR). The proposed FSR structure consists of windmill-shaped resistive absorbers and double-layer square-ring frequency selective surfaces. The absorber layer incorporates a U-shaped metal structure that acts as an LC parallel resonator, achieving wideband electromagnetic wave transmission. Simulation results show that this FSR design has -1 dB insertion loss from 8.0 to 12.2 GHz, with a minimum of -0.4 dB. A wideband FSR was fabricated and measured to validate the design. © 2024 IEEE.

关键词： Frequency selective surfaces

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Multi-view infrared small target recognition based on YOLOv5

Multi-view infrared small target recognition based on YOLOv5

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2022 Chinese Automation Congress, CAC 2022

作者： Gong, Hua Liu, Shasha Guan, Song Yu, Kuaikuai Liu, Fang College of Science Shengyang Ligong University Shenyang110159 China Science and Technology on Electro-Optical Information Security Control Laboratory Tianjing300308 China

ISBN: (纸本)9781665465335

In order to improve the recognition accuracy of small infrared targets in complex environment, a SyluInfrared dataset is built by taking multi-view infrared images with the Frock TiX600 infrared thermal imager. Seven image enhancement algorithms including image brightening, contrast adjustment, image blurring, image flipping and image scaling are designed to improve the image quality of small infrared targets. The YOLOv5 deep learning model is used to identify small infrared targets with multiple views to improve the recognition accuracy of small infrared targets. The experimental results show that the accuracy of multi-view infrared small target recognition model for YOLOv5 deep network is 97.7%, which is 6.6% higher than that of single-view infrared small target recognition model based on YOLOv5. The multi-view target recognition strategy significantly improves the infrared small target recognition performance. © 2022 IEEE.

关键词： Image enhancement

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Mitigation of Non-stationary Jammings with Missing Samples for GNSS Using Sparse Representation

Mitigation of Non-stationary Jammings with Missing Samples f...

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2022 International Conference on Computer Engineering and Artificial Intelligence, ICCEAI 2022

作者： Ren, Yuetao Zhi, Yongfeng Zhang, Jun School of Automation Northwestern Polytechnical University Xi'an710072 China Science and Technology on Electro-Optical Information Security Control Laboratory Tianjin300308 China

ISBN: (数字)9781665468039

ISBN: (纸本)9781665468039

Global navigation satellite systems (GNSS) are widely used in most civil and military applications. However, GNSS receivers suffer from severe performance degradation when jammed by electromagnetic interference. This paper considers the mitigation problem of non-stationary jammings with missing samples for GNSS. We propose to reconstruct the interference by sparse representation utilizing the sparsity of jammings in the time-frequency (TF) domain. The GNSS signal is recovered by eliminating the reconstructed interference from the received signal. First, the instantaneous frequencies (IFs) of jammings are extracted from adaptive directional TF distributions. Then, we construct the over-complete atomic dictionary based on the estimated IFs. The interference is reconstructed by orthogonal matching pursuit (OMP) algorithm. The proposed method can achieve the mitigation of non-stationary jamming and the acquisition of GNSS signals in the presence of missing samples. We confirm the effectiveness of the algorithm by simulations. © 2022 IEEE.

关键词： Jamming

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New ultrashort pulsewidth measurement technology based on interference jitter and FPGA platform

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Chinese Optics Letters 2022年第3期20卷 46-51页

作者： Jin Li Yanbo Dou Lixin Wang Jinhai Zou Yu Ding Hang Wang Qiujun Ruan Zhipeng Dong Zhengqian Luo Department of Electronic Engineering Xiamen UniversityXiamen 361005China Science and Technology on Electro-Optical Information Security Control Laboratory Tianjin 300308China

Conventional ultrashort pulsewidth measurement technology is autocorrelation based on second-harmonic generation;however,nonlinear crystals and bulky components are required,which usually leads to the limited wavelength range and the difficult adjustment with free-space light ***,we proposed a compact all-fiber pulsewidth measurement technology based on the interference jitter(IJ)and field-programmable gate array(FPGA)platform,without requiring a nonlinear optical device(*** crystal/detector).Such a technology shows a wide measurement waveband from 1 to 2.15μm at least,a pulsewidth range from femtoseconds to 100 ps,and a small relative error of 0.15%-3.8%.In particular,a minimum pulse energy of 219 fj is experimentally detected with an average-power-peak-power product of 1.065×10^(-6)W^(2).The IJ-FPGA technology may offer a new route for miniaturized,user-friendly,and broadband pulsewidth measurement.

关键词： pulse width measurement interference jitter FPGA platform optical device

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Recent Advances in electromagnetic Optimization Methods for Metamaterial Absorbers

Recent Advances in Electromagnetic Optimization Methods for ...

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2024 International Applied Computational electromagnetics Society Symposium, ACES-China 2024

作者： Fu, Jiaping Jin, Jing Liu, Zixin Cao, Ke Li, Tengyu Lin, Hai Chen, Lijie Central China Normal University College of Physics Science and Technology Wuhan China Huazhong University of Science and Technology National Key Laboratory of Electromagnetic Effect and Security on Marine Equipment China Ship Development and Design Centre China and School of Optical and Electronic Information Wuhan China

ISBN: (纸本)9798350355581

Metamaterial absorbers have superior performance in absorbing, suppressing, and manipulating the electromagnetic (EM) waves. Due to the challenges of finding the optimal design parameters, the EM optimization for metamaterial absorbers is time-consuming. It is important to develop an efficient method to improve the speed and efficiency of EM optimization for metamaterial absorbers. This paper provides recent advances in EM optimization methods for metamaterial absorbers, including the artificial neural network (ANN) surrogate-based optimization method and the ANN-space mapping (SM) surrogate-based optimization method. © 2024 IEEE.

关键词： Mapping

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STG-Siam:Siamese object tracking based on Sparse Self Attention and Graph information interaction 3

STG-Siam:Siamese object tracking based on Sparse Self Attent...

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3rd International Computing Imaging Conference, CITA 2023

作者： Yining, Yang Jinsong, Leng Hua, Cai Wancheng, Liu Yuhai, Li National Key Laboratory of Electromagnetic Space Security Tianjin300308 China School of electronic information engineering Changchun University of Science and Technology Changchun130022 China Changchun China Optical Science and Technology Museum Changchun130117 China

ISBN: (纸本)9781510671409

Aiming at the problems of insufficient foreground and background discrimination ability of the tracking algorithm in complex scenes, and limited ability to cope with the situation of partial occlusion of the target, we propose a target tracking algorithm based on sparse self-attention interaction with graph information (STG-Siam). To deal with background interference during tracking, a sparse self-attention mechanism is designed to make the model focus more on foreground information and suppress attention to background information. To better handle partial occlusions during tracking, template features and search region features are mapped to graph structures, and local information interaction between graph nodes is used to generate higher quality feature response maps. Experiments on the publicly available datasets VOT2018 and UAV123 demonstrate the effectiveness of the proposed STG-Siam, which can achieve accurate and robust tracking in complex scenarios. © 2023 SPIE.

关键词： Target tracking

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Comprehensive study of the ultrafast photoexcited carrier dynamics in Sb_(2)Te_(3)–GeTe superlattices

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Chinese Physics B 2024年第7期33卷 381-387页

作者：叶之江金钻明蒋叶昕卢琦贾梦辉钱冬黄夏敏李舟彭滟朱亦鸣 Terahertz Technology Innovation Research Institute Terahertz Spectrum and Imaging Technology Cooperative Innovation CenterShanghai Key Laboratory of Modern Optical SystemUniversity of Shanghai for Science and TechnologyShanghai 200093China Shanghai Institute of Intelligent Science and Technology Tongji UniversityShanghai 200092China Key Laboratory of Artificial Structures and Quantum Control(Ministry of Education) Shenyang National Laboratory for Materials ScienceSchool of Physics and AstronomyShanghai Jiao Tong UniversityShanghai 200240China Tsung-Dao Lee Institute Shanghai Jiao Tong UniversityShanghai 200240China State Key Laboratory of Precision Spectroscopy East China Normal UniversityShanghai 200062China GBA Branch of Aerospace Information Research Institute Chinese Academy of SciencesGuangzhou 510700China Guangdong Provincial Key Laboratory of Terahertz Quantum Electromagnetics Guangzhou 510700China University of Chinese Academy of Sciences Beijing 100039China

Chalcogenide superlattices Sb_(2)Te_(3)-GeTe is a candidate for interfacial phase-change memory(iPCM) data storage *** employing terahertz emission spectroscopy and the transient reflectance spectroscopy together,we investigate the ultrafast photoexcited carrier dynamics and current transients in Sb_(2)Te_(3)-GeTe *** orientation and excitation polarization dependences of the THz emission confirm that ultrafast thermo-electric,shift and injection currents contribute to the THz generation in Sb_(2)Te_(3)-GeTe *** decreasing the thickness and increasing the number of GeTe and Sb_(2)Te_(3) layer,the interlayer coupling can be enhanced,which significantly reduces the contribution from circular photo-galvanic effect(CPGE).A photo-induced bleaching in the transient reflectance spectroscopy probed in the range of~1100 nm to~1400 nm further demonstrates a gapped state resulting from the interlayer *** demonstrates play an important role in the development of iPCM-based high-speed optoelectronic devices.

关键词： Sb_(2)Te_(3)/GeTe superlattices ultrafast carrier dynamics interfacial phase change memory THz emission spectroscopy transient reflectance spectroscopy

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A multi-source signals separation algorithm for identifying the threatening signals applied in Fiber-Optic Distributed Acoustic Sensor

A multi-source signals separation algorithm for identifying ...

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2023 optical Fiber Communications Conference and Exhibition, OFC 2023

作者： He, Tao Zhang, Shixiong Li, Hao Yan, Zhijun Liu, Deming Sun, Qizhen School of Cyber Science and Engineering Huazhong University of Science and Technology Hubei Key Laboratory of Distributed System Security Hubei Engineering Research Center on Big Data Security Wuhan430074 China Optics Valley Laboratory Huazhong University of Science and Technology School of Optical and Electronic Information National Laboratory for Optoelectronics National Engineering Laboratory for Next Generation Internet Access System Wuhan430074 China

A multi-source signals separation algorithm is proposed to identify the potential threatening signals submerged in the strong background noises. Finally, the recognition rate of the mixed signals is improved from 62.8... 详细信息

ISBN: (纸本)9781957171180

关键词： Source separation

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