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DOA Estimation Exploiting a Single Moving Acoustic Vector Sensor: A Cramér-Rao Bound-Based Study

IEEE Transactions on Vehicular technology 2025年第5期74卷 7508-7523页

作者： Qu, Xinghao Shang, Zhigang Qiao, Gang Liu, Songzuo National Key Laboratory of Underwater Acoustic Technology Harbin Engineering University Harbin150001 China Harbin Engineering University Ministry of Industry and Information Technology Key Laboratory of Marine Information Acquisition and Security Harbin150001 China Harbin Engineering University College of Underwater Acoustic Engineering Harbin150001 China Sanya Nanhai Innovation and Development Base of Harbin Engineering University Sanya572024 China

Motivated by the emerging interest in direction-of-arrival (DOA) estimation exploiting array motions, this paper investigates a practical application scenario involving a single moving acoustic vector sensor (AVS). By reasonably arranging observations at different times, we construct a flexible measurement model for the resulting dual-AVS synthetic array. Since multiple components of an AVS are physically co-located, incorporating a synthetic aperture via the translation motion can contribute to remarkable performance improvement. Aiming at an explicit analysis, we delve into the corresponding Cramér-Rao bound (CRB) in the single-source case and formulate a CRB optimization problem to determine the optimal measurement model. Thanks to significant simplifications, we derive a closed-form CRB expression, which provides insight into the system performance and favors the analytical solution of the optimization problem. Regarding DOA estimation, especially for the spatially nonuniform noise specific to AVSs, we propose a weighted maximum likelihood estimator (WMLE) to fully leverage the promised theoretical gain in terms of the CRB. Further noting the intrinsic relationship between the WMLE performance and array data arrangement, we design a two-phase iterative procedure that updates the DOA estimate and the measurement matrix structure alternately to approximate the global optimal solution. Numerical experiments corroborate our analytical derivations and validate the statistical efficiency of the proposed methods. Their mean-square errors are tightly lower bounded by the derived CRBs at high signal-to-noise ratios. © 1967-2012 IEEE.

关键词： Mean square error

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Review of data security within energy blockchain:A comprehensive analysis of storage,management,and utilization

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High-Confidence Computing 2024年第3期4卷 82-102页

作者： Yunhua He Zhihao Zhou Yan Pan Fahui Chong Bin Wu Ke Xiao Hong Li School of Information Science and Technology North China University of TechnologyBeijing 100144China China Industrial Control Systems Cyber Emergency Response Team Beijing 100040China Key Laboratory in Blockchain and Data Security by Ministry of Industry and Information Technology Beijing 100040China Institute of Information Engineering Chinese Academy of Sciences Beijing 100195China

Energy systems are currently undergoing a transformation towards new paradigms characterized by decarbonization,decentralization,democratization,and *** this evolving context,energy blockchain,aiming to enhance efficiency,transparency,and security,emerges as an integrated technological solution designed to address the diverse challenges in this *** security is essential for the reliable and efficient functioning of energy *** pressing need to address challenges related to secure data storage,effective data management,and efficient data utilization is increasingly *** paper offers a comprehensive survey of academic discourse on energy blockchain data security over the past five years,adopting an all-encompassing perspective that spans data storage,management,and *** work systematically evaluates and contrasts the strengths and weaknesses of various research ***,this paper proposes an integrated hierarchical on-chain and off-chain security energy blockchain architecture,specifically designed to meet the complex security requirements of multi-blockchain business ***,this paper identifies key directions for future research,particularly in advancing the integration of storage,management,and utilization of energy blockchain data security.

关键词： Energy blockchain Data security Storage Management Utilization

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Deep Learning Based Signal Detector for OFDM systems

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China Communications 2023年第12期20卷 66-77页

作者： Guangliang Pan Wei Wang Minglei Li Key Laboratory of Dynamic Cognitive System of Electromagnetic Spectrum Space Ministry of Industry and Information TechnologyCollege of Electronic and Information EngineeringNanjing University of Aeronautics and AstronauticsNanjing 211106China College of Control Science and Engineering China University of Petroleum(East China)Qingdao 266580China

In this paper,we propose a novel deep learning(DL)-based receiver design for orthogonal frequency division multiplexing(OFDM)*** entire process of channel estimation,equalization,and signal detection is replaced by a neural network(NN),and hence,the detector is called a NN detector(N^(2)D).First,an OFDM signal model is *** analyze both temporal and spectral characteristics of OFDM signals,which are the motivation for ***,the generated data based on the simulation of channel statistics is used for offline training of bi-directional long short-term memory(Bi-LSTM)***,a discriminator(F)is added to the input of Bi-LSTM NN to look for subcarrier transmission data with optimal channel gain(OCG),which can greatly improve the performance of the ***,the trained N^(2)D is used for online recovery of OFDM *** performance of the proposed N^(2)D is analyzed theoretically in terms of bit error rate(BER)by Monte Carlo simulation under different parameter *** simulation results demonstrate that the BER of N^(2)D is obviously lower than other algorithms,especially at high signal-to-noise ratios(SNRs).Meanwhile,the proposed N^(2)D is robust to the fluctuation of parameter values.

关键词： channel estimation deep learning OFDM optimal channel gain signal detection

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Driving into Danger: Adversarial Patch Attack on End-To-End Autonomous Driving systems Using Deep Learning 28

Driving into Danger: Adversarial Patch Attack on End-To-End ...

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28th IEEE Symposium on Computers and Communications, ISCC 2023

作者： Wang, Tong Kuang, Xiaohui Li, Hu Du, Qianjin Hu, Zhanhao Deng, Huan Zhao, Gang Institute of System Engineering Academy of Military Sciences Beijing China National Key Laboratory of Science and Technology on Information System Security Beijing China

ISBN: (纸本)9798350300482

Deep learning-based autonomous driving systems have been extensively researched due to their superior performance compared to traditional methods. Specifically, end-To-end deep learning systems have been developed, which directly output control signals for vehicles using various sensor inputs. However, deep learning techniques are vulnerable to security issues, generating adversarial examples that can attack the output of the relevant model. This paper proposes an adversarial example generation method that applies a patch to pedestrians' clothing, which can generate dangerous behaviors when the pedestrian appears within the camera lens, thereby attacking the end-To-end autonomous driving system. The proposed method is validated using the CARLA simulator, and the results demonstrate successful attacks in various weather and lighting conditions, exposing the security vulnerabilities of this type of system. This study highlights the need for further research to address these vulnerabilities and ensure the safety of autonomous driving systems. © 2023 IEEE.

关键词： Deep learning

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An Improved YOLOv5s-Based Smoke Detection system for Outdoor Parking Lots

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Computers, Materials & Continua 2024年第8期80卷 3333-3349页

作者： Ruobing Zuo Xiaohan Huang Xuguo Jiao Zhenyong Zhang State Key Laboratory of Public Big Data College of Computer Science and TechnologyGuizhou UniversityGuiyang550025China School of Information and Control Engineering Qingdao University of TechnologyQingdao266520China State Key Laboratory of Industrial Control Technology College of Control Science and EngineeringZhejiang UniversityHangzhou310027China Key Laboratory of Computing Power Network and Information Security Ministry of EducationQilu University of Technology(Shandong Academy of Sciences)Jinan250353China Text Computing&Cognitive Intelligence Engineering Research Center of National Education Ministry Guizhou UniversityGuiyang550025China

In the rapidly evolving urban landscape,outdoor parking lots have become an indispensable part of the city’s transportation *** growth of parking lots has raised the likelihood of spontaneous vehicle combus-tion,a significant safety hazard,making smoke detection an essential preventative ***,the complex environment of outdoor parking lots presents additional challenges for smoke detection,which necessitates the development of more advanced and reliable smoke detection *** paper addresses this concern and presents a novel smoke detection technique designed for the demanding environment of outdoor parking ***,we develop a novel dataset to fill the gap,as there is a lack of publicly available *** dataset encompasses a wide range of smoke and fire scenarios,enhanced with data augmentation to ensure robustness against diverse outdoor ***,we utilize an optimized YOLOv5s model,integrated with the Squeeze-and-Excitation Network(SENet)attention mechanism,to significantly improve detection accuracy while maintaining real-time processing ***,this paper implements an outdoor smoke detection system that is capable of accurately localizing and alerting in real time,enhancing the effectiveness and reliability of emergency *** show that the system has a high accuracy in terms of detecting smoke incidents in outdoor scenarios.

关键词： YOLOv5s smoke detection deep learning SENet

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Study on Low-Frequency Small-Scale Longitudinal Transducer with Spiral Spring

Study on Low-Frequency Small-Scale Longitudinal Transducer w...

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2024 OES China Ocean Acoustics, COA 2024

作者： Zhang, Yishuang Sang, Yongjie Wu, Shuai National Key Laboratory of Underwater Acoustic Technology Harbin China Harbin Engineering University Key Laboratory of Marine Information Acquisition and Security Ministry of Industry and Information Technology Harbin China College of Underwater Acoustic Engineering Harbin Engineering University Harbin China

ISBN: (纸本)9798350340297

To extend the working frequency band of the longitudinal transducer to the low-frequency band, this study proposes a type of low-frequency longitudinal transducer structure with a spring-mass system driven by the piezoelectric vibrator, which utilizes the piezoelectric vibrator to excite the low-frequency mode of the spring-mass system. In this study, the equivalent circuit of the transducer is given. On the base of the equivalent circuit, the relationship between the source level and the structure parameters of the transducer is analyzed. The finite element model of the transducer is established, and the modal analysis and harmonic analysis are conducted. The theoretical results calculated by the equivalent circuit are in good agreement with the simulation results solved via the finite element method. The virtual prototype realizes low-frequency resonance at 560 Hz with a total length of 0.187 m. The source level in the frequency band of 300-1000 Hz is remarkably enhanced when compared with the traditional structure. The transducer of this structure can produce small-scale and low-frequency resonance, thus expanding the application of the longitudinal transducer to the field of ship-radiated noise simulation. © 2024 IEEE.

关键词： Vibrators

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Tracking control in Presence of Obstacles and Uncertainties for Bioinspired Spherical Underwater Robots

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Journal of Bionic engineering 2023年第1期20卷 323-337页

作者： Chunying Li Shuxiang Guo Jian Guo Graduate School of Engineering Kagawa UniversityTakamatsuKagawa761-0396Japan Key Laboratory of Convergence Medical Engineering System and Healthcare Technology the Ministry of Industry and Information TechnologySchool of Life Science and TechnologyBeijing Institute of TechnologyBeijing100081China Tianjin Key Laboratory for Control Theory and Applications in Complicated Systems and Intelligent Robot Laboratory Tianjin University of TechnologyBinshui Xidao Extension 391Tianjin300384China

During marine missions,AUVs are susceptible to external disturbances,such as obstacles,ocean currents,etc.,which can easily cause mission failure or *** this paper,considering the strong nonlinearities,external disturbances and obstacles,the kinematic and dynamic model of bioinspired Spherical Underwater Robot(SUR)was ***,the waypoints-based trajectory tracking with obstacles and uncertainties was proposed for SUR to guarantee its safety and ***,the Lyapunov theory was adopted to verify the stability and the Slide Mode control(SMC)method is used to verify the robustness of the control *** addition,a series of simulations were conducted to evaluate the effectiveness of proposed control *** tests,including path-following,static and moving obstacle avoidance were performed which verified the feasibility,robustness and effectiveness of the designed control ***,a series of experiments in real environment were performed to verify the performance of the control *** simulation and experimental results of the study supplied clues to the improvement of the path following capability and multi-obstacle avoidance of AUVs.

关键词： Path following Obstacle avoidance Bioinspired.Spherical underwater robot(SUR) Lyapunov theory

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Mn-based MXene with high lithium-ion storage capacity

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Nano Research 2024年第5期17卷 4181-4191页

作者： Yanyan Wu Dongqing Liu Xiaonan Wang Usman Ghani Muhammad Asim Mushtaq Jinfeng Yang Huarui Sun Panagiotis Tsiakaras Xingke Cai School of Science and Ministry of Industry and Information Technology Key Laboratory of Micro-Nano Optoelectronic Information System Harbin Institute of Technology ShenzhenShenzhen 5180552 China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China Institute for Advanced Study Shenzhen UniversityShenzhen 518060China College of Mechatronics and Control Engineering Shenzhen UniversityShenzhen 518060China Laboratory of Alternative Energy Conversion Systems Department of Mechanical EngineeringSchool of EngineeringUniversity of ThessalyPedion Areos 38834Greece

3d-transition metal(Fe,Co,Ni,and Mn)-based MXene materials have been predicted to demonstrate exceptional electrochemical performance because of their good electrical conductivity and the presence of metallic atoms with multiple charge ***,until now,there have been no reports on MXenes based on Fe,Co,Ni,and Mn,due to the lack of 3d-metal-layered ***,we successfully synthesized the first 3d-transition metal-based MXenes,Mn_(2)CT_(x) by exfoliating a layered precursor derived from the anti-perovskite bulk *** as-prepared Mn_(2)CT_(x) MXene nanosheets were employed as anode materials in lithium-ion batteries,which exhibited stable storage capacity of 764.7 mAh·g^(-1) at 0.5 C,placing its storage capacities at an upper-middle level compared with other reported MXene materials as well as other Mn-based anode ***,this study opens a new avenue for MXene research by synthesizing 3d-transition metal-based MXenes for electrochemical applications.

关键词： Mn_(3)GaC Mn_(2)CT_(x) MXenes lithium-ion battery anode materials negative fading capacity

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Mechanism of the electromagnetic force to control hydrodynamic noise from an airfoil model and its action mode

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Chinese Journal of Acoustics 2024年第2期43卷 173-198页

作者： LIU Yongwei WANG Lu QIN Qikai ZHENG Penghui SHANG Dejiang National Key Laboratory of Underwater Acoustic Technology Harbin Engineering UniversityHarbin 150001 Key Laboratory of Marine Information Acquisition and Security(Harbin Engineering University) Ministry of Industry and Information TechnologyHarbin 150001 College of Underwater Acoustic Engineering Harbin Engineering UniversityHarbin 150001

A method is proposed to control the flow and reduce the hydrodynamic noise by applying the constant electromagnetic force into the boundary layer. The flow and sound fields from an airfoil model with and without the electromagnetic force are calculated. Results show that along the flow direction, electromagnetic force can delay the flow separation on the airfoil surface, suppress small discrete vortices, reduce turbulent fluctuation pressure on the airfoil surface, and decrease the hydrodynamic noise. The change law of the hydrodynamic noise effect reduced by the electromagnetic force is summarized in terms of the Reynolds number, attack angle, and electromagnetic effective *** on the numerical calculation results, an actual model is experimentally measured in the water circulating tank to validate the abovementioned effect. Since the transition area pressure of the airfoil model is the lowest and the area is limited, the application of electromagnetic force into this area can achieve the lowest noise effect and decrease the power consumption. The effect of the magnetic leak is analyzed. The results provide a new method for the suppression of hydrodynamic noise in airfoil models.

关键词： airfoil noise flow

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Network Protocol Migration Framework: A Protocol Migration Framework for Underwater Network Based on NS3

Network Protocol Migration Framework: A Protocol Migration F...

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2024 OES China Ocean Acoustics, COA 2024

作者： Ji, Xiaofeng Zhou, Feng Harbin Engineering University National Key Laboratory of Underwater Acoustic Technology Harbin150001 China Ministry of Industry and Information Technology Key Laboratory of Marine Information Acquisition and Security Harbin150001 China Harbin Engineering University College of Underwater Acoustic Engineering Harbin150001 China

ISBN: (纸本)9798350340297

Underwater information network research incorporates many cutting-edge technologies that greatly facilitate the optimal use of information-sharing resources, thereby remarkably improving the operational effectiveness of multiple military platforms. However, the inherent limitations of underwater acoustic channels, including limited communication bandwidth, notable multipath effects, and severe Doppler frequency shifts, have posed great challenges to the research of hydroacoustic communication networks. Nevertheless, current research on hydroacoustic communication networks remains at the level of theoretical simulation and lacks implementation on devices. In this study, an innovative framework that aims to smoothly migrate network protocols from simulation environments to hardware platforms is elaborated and proposed. The framework is based on existing simulation modules and cleverly develops several components that allow it to be directly adapted to real hydroacoustic modems without the need for remarkable modifications to the network protocol. In this study, the differences between simulation and experimental results for the same channel parameters are compared by performing common medium access control layer network simulations and experiments on the core board of a hydroacoustic modem, thus providing an in-depth validation of the superior performance of our framework. This result not only demonstrates the framework's ability to maintain consistency between simulated and real environments but also highlights its key potential and clear technological advantages in advancing the field of underwater network research. © 2024 IEEE.

关键词： network protocol migration framework NS3 protocol implementation underwater acoustic communication network

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