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6th International Conference on Signal and Image Processing, ICSIP 2021

作者： Nan, Pulong Wang, Lijun Pan, Gaofeng Science and Technology On Communication Information Security Control Laboratory Jiaxing China

ISBN: (纸本)9780738133737

The paper focuses on the covariance matrix and freedom degree widely involved in array anti-jamming processing. Based on the eigen decomposition of array covariance matrix of received signals, the correlation properties as well as the relationship between eigenvalue distribution of covariance matrix and consumed freedom degrees of array are researched and analyzed, with GNSS anti-jamming array taken as an example. Simulation experiments are done to explain a number of representative conditions and help summarize several deploying instructions for the platforms carrying anti-jamming arrays, so as to avoid freedom degrees being consumed much and ensure the anti-jamming capabilities. © 2021 IEEE.

关键词： Covariance matrix

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Phased Array Full-Duplex for Concurrent Multifunction: Architecture and Implementation 13

Phased Array Full-Duplex for Concurrent Multifunction: Archi...

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13th International Conference on Microwave and Millimeter Wave technology, ICMMT 2021

作者： Chen, Shunyang Chen, Jiarui Huang, Xiaoguo Chen, Linglu Zhang, Qi Chen, Binhui Zhu, Menglei Science And Technology On Communication Information Security Control Laboratory Jiaxing China

ISBN: (纸本)9781665434379

In this article, the realization of concurrent multifunction in phased array full-duplex platforms is discussed. For modern complex electromagnetic environment, an efficient architecture is needed to accomplish the concurrent working of several different functions, such as communication, radar, spectrum sensing and so on. First, we establish a novel architecture based on the phased array system to effectively incorporate current approaches useful for realizing concurrent multifunction. Then, a prototype implementation based on multi-objective beamforming is proposed to demonstrate the role of digital methods in cancelling self-interferenc. Finally, simulation and experimental results are exhibited to prove the result of the proposed method. © 2021 IEEE.

关键词： Architecture

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SDM-based electronic defense intelligent networking technology 8

SDM-based electronic defense intelligent networking technolo...

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8th Symposium on Novel Photoelectronic Detection technology and Applications

作者： Ma, Baoqiang Liu, Tongyu Yong, Zhang Shuai, Jia Dong, Liu Science and Technology on Electro-Optical Information Security Control Laboratory Tianjin300308 China

ISBN: (数字)9781510653122

ISBN: (纸本)9781510653115

With the increasingly prominent role of high-tech weapons in modern warfare, electronic warfare has also become a topic that has attracted worldwide attention. At present, global electronic warfare is in an important period of transformation and development. In particular, the US military has made substantial progress in electronic warfare in recent years. The development of electronic defense has played a decisive role in future wars[1]. This article introduces the application system architecture and operating mechanism of SDM. At the same time, it introduces the application of plug-and-play SDM software in modern electronic defense system operations, and expounds the role of intelligent command in future electronic warfare. SDM software can realize the plug-and-play of sensor equipment, and it plays a key role in the intelligent network of electronic defense. © 2022 SPIE

关键词： Electronic warfare

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Signals of Opportunity Navigation Using LTE Downlink Signals 22

Signals of Opportunity Navigation Using LTE Downlink Signals

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22nd IEEE International Conference on communication technology, ICCT 2022

作者： Wang, Yiteng Zhu, Huijie Liang, Tianyi Qian, Jiachuan The 36th Research Institute of China Electronics Technology Group Corporation Science and Technology on Communication Information Security Control Laboratory Jiaxing China

ISBN: (纸本)9781665470674

For the global navigation satellite system (GNSS) cannot meet the positioning requirements under occlusion or malicious interference, this paper proposes a receiver self-localization method using long-term evolution (LTE) downlink signals. The method is based on the multi-station time difference location mechanism. The signal acquisition of multi-base stations (BSs) is realized by signal demodulation. The transmission time difference calibration is used to solve the asynchronous problem among BSs. The synchronous signal and cell-specific reference signal are comprehensively detected to extract high-precision time difference parameters. The receiver can calculate and obtain its own position by using these timing parameters. Finally, a software-defined receiver is built to carry out experiments in the outdoor environment. Experimental results show that the positioning distance and moving direction are basically consistent with the actual situation. The root mean square error (RMSE) is less than 5m, which fully verifies the feasibility of LTE as an opportunity signal for navigation. © 2022 IEEE.

关键词： Navigation

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Hyper-Tuned Convolutional Neural Networks for Authorship Verification in Digital Forensic Investigations

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Computers, Materials & Continua 2023年第8期76卷 1947-1976页

作者： Asif Rahim Yanru Zhong Tariq Ahmad Sadique Ahmad Mohammed A.ElAffendi School of Computer and Information Security Guilin University of Electronic TechnologyGuilin541004China Guangxi Key Laboratory of Intelligent Processing of Computer Images and Graphics Guilin University of Electronic TechnologyGuilin541004China School of Information and Communication Guilin University of Electronic TechnologyGuilin541004China EIAS:Data Science and Blockchain Laboratory College of Computer and Information SciencesPrince Sultan UniversityRiyadh11586Saudi Arabia

Authorship verification is a crucial task in digital forensic investigations,where it is often necessary to determine whether a specific individual wrote a particular piece of *** Neural Networks(CNNs)have shown promise in solving this problem,but their performance highly depends on the choice of *** this paper,we explore the effectiveness of hyperparameter tuning in improving the performance of CNNs for authorship *** conduct experiments using a Hyper Tuned CNN model with three popular optimization algorithms:Adaptive Moment Estimation(ADAM),StochasticGradientDescent(SGD),andRoot Mean Squared Propagation(RMSPROP).The model is trained and tested on a dataset of text samples collected from various authors,and the performance is evaluated using accuracy,precision,recall,and F1 *** compare the performance of the three optimization algorithms and demonstrate the effectiveness of hyperparameter tuning in improving the accuracy of the CNN *** results show that the Hyper Tuned CNN model with ADAM Optimizer achieves the highest accuracy of up to 90%.Furthermore,we demonstrate that hyperparameter tuning can help achieve significant performance improvements,even using a relatively simple model architecture like *** findings suggest that the choice of the optimization algorithm is a crucial factor in the performance of CNNs for authorship verification and that hyperparameter tuning can be an effective way to optimize this ***,this paper demonstrates the effectiveness of hyperparameter tuning in improving the performance of CNNs for authorship verification in digital forensic *** findings have important implications for developing accurate and reliable authorship verification systems,which are crucial for various applications in digital forensics,such as identifying the author of anonymous threatening messages or detecting cases of plagiarism.

关键词： Convolutional Neural Network(CNN) hyper-tuning authorship verification digital forensics

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Analysis of pump power distribution in diode pumped Tm:YAP laser 8

Analysis of pump power distribution in diode pumped Tm:YAP l...

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8th Symposium on Novel Photoelectronic Detection technology and Applications

作者： Wang, Lixin Xu, Hong Yan, Mengmeng Science and Technology on Electro-Optical Information Security Control Laboratory Tianjin300308 China

ISBN: (数字)9781510653122

ISBN: (纸本)9781510653115

We analyzed the space overlap of laser transverse modes inside cavity of a Tm:YAP laser and derived the formulae of laser pump power distribution on variable harmonic transverse modes. The method for reducing the influences of high-order transverse mode on laser output beam quality are put forward and validated by experiments, the results can be used in the designing of such lasers. © 2022 SPIE

关键词： Pumping (laser)

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Type-Ⅰ Waveguide and Y-Branch Splitter Fabricated by Femtosecond Laser Direct Writing in X-cut LiNO3 Crystal 4

Type-Ⅰ Waveguide and Y-Branch Splitter Fabricated by Femtos...

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4th International Conference on Optoelectronic science and Materials, ICOSM 2022

作者： Jiang, Xiaorui Liub, Hongliang Yanga, Haibo Chenga, Jingxin Gua, Jianda Science and Technology on Electro-Optical Information Security Control Laboratory Tianjin300300 China Tianjin Key Laboratory of Micro-scale Optical Information Science and Technology Institute of Modern Optics Nankai University Tianjin300350 China

ISBN: (纸本)9781510662209

At present, femtosecond laser direct writing (FLDW) with high efficiency, has been a popular method to process all kinds of waveguide in optical functional materials. In this paper, the fabrication of Type-Ⅰ waveguides and Y-branch splitters in pure x-cut LiNO3 (LN) crystal by FLDW has been reported. A guiding cross-section configuration has been produced, resulting from a positive refractive index area along the track induced by FLDW. An end-face coupling system has been used to explore the supported guiding modes at 632.8 nm. Experimental results reveal both TE mode and TM mode are supported in the waveguide, and the total loss of TE mode is larger. For Y-branch splitters, with the splitting angle increasing, the total loss increases rapidly. © 2023 SPIE. All rights reserved.

关键词： Femtosecond lasers

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A Low-noise Frequency-agile Ku-band Frequency Synthesizer for Wideband Frequency Hopping communication System

A Low-noise Frequency-agile Ku-band Frequency Synthesizer fo...

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2023 IEEE MTT-S International Microwave Workshop Series on Advanced Materials and Processes for RF and THz Applications, IMWS-AMP 2023

作者： Luo, Ding Shao, Huaizong Zhu, Xueyong Yang, Yuanwang Information and Communication Engineering University of Electronic Science and Technology of China China Laboratory of Electromagnetic Space Cognition and Intelligent Control China

ISBN: (纸本)9798350308761

In this paper, a low-noise frequency-agile Ku-band frequency synthesizer for the wideband frequency hopping communication system is proposed. Three analog PLL (phase locked loop), two of which constitute an in-loop mixing architecture scheme, are used to provide the carrier frequency in wide low-noise frequency coverage. With out-of-loop and in-loop mixing architecture, the carrier frequency source implemented in the paper has superior performance on frequency jitter, which can be shown as the phase noise level less than -107.3dBc/Hz@1kHz when the carrier frequency is between 12 GHz to 15 GHz in 2 MHz steps. The spurious level is below -64 dBc, and the frequency hopping time is less than 40 us. © 2023 IEEE.

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Dim and small targets based on the fusion of infrared radiation characteristics and spectral characteristics research on detection methods 8

Dim and small targets based on the fusion of infrared radiat...

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8th Symposium on Novel Photoelectronic Detection technology and Applications

作者： Dong, Liu Yang, Yining Liu, Tongyu Yong, Zhang Hu, Yutong Shuai, Jia Ma, Baoqiang Science and Technology on Electro-Optical Information Security Control Laboratory Tianjin300308 China

ISBN: (数字)9781510653122

ISBN: (纸本)9781510653115

The geometric and motion characteristics of false targets are more similar to those of real targets. The detection accuracy of traditional infrared radiation characteristics methods for infrared targets is obviously low. For small infrared weak targets with small size and low signal-to-noise ratio, it is difficult to effectively extract shape features by using a single band detection method. Therefore, this paper makes full use of the advantages of infrared single band image and multispectral image target detection methods, and combines single band detection technology and multispectral detection technology, which not only avoids the defect of single band detection missing alarm, but also reduces the impact of large amount of multispectral detection data, and has real-time performance and good detection effect. The hybrid detection algorithm proposed in this paper has stronger adaptability, higher recognition rate and faster processing ability. © 2022 SPIE

关键词： Infrared radiation

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Exploiting the Direct Link in IRS Assisted NOMA Networks with Hardware Impairments

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Computer Modeling in Engineering & sciences 2023年第7期136卷 767-785页

作者： Ziwei Liu Xinwei Yue Shuo Chen Xuliang Liu Yafei Wang Wanwei Tang Key Laboratory of Modern Measurement&Control Technology Ministry of EducationSchool of Information and Communication EngineeringBeijing Information Science and Technology UniversityBeijing100101China The Party Committee Office Yellow River Conservancy Technical InstituteKaifeng475001China Tangshan University Tangshan063000China

Hardware impairments(HI)are always present in low-cost wireless *** paper investigates the outage behaviors of intelligent reflecting surface(IRS)assisted non-orthogonal multiple access(NOMA)networks by taking into account the impact of ***,we derive the approximate and asymptotic expressions of the outage probability for the IRS-NOMA-HI *** on the asymptotic results,the diversity orders under perfect self-interference cancellation and imperfect self-interference cancellation scenarios are obtained to evaluate the performance of the considered *** addition,the system throughput of IRS-NOMA-HI is discussed in delay-limited *** obtained results are provided to verify the accuracy of the theoretical analyses and reveal that:1)The outage performance and system throughput for IRS-NOMA-HI outperforms that of the IRS-assisted orthogonal multiple access-HI(IRS-OMA-HI)networks;2)The number of IRS elements,the pass loss factors,the Rician factors,and the value of HI are pivotal to enhancing the performance of IRS-NOMAHI networks;and 3)It is recommended that effective methods of reducing HI should be used to ensure system performance,in addition to self-interference cancellation techniques.

关键词： Hardware impairments imperfect SIC intelligent reflecting surface non-orthogonal multiple access outage probability

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