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8th IEEE International Conference on Network Intelligence and Digital Content, IC-NIDC 2023

作者： Wang, Ping Xu, Zhan Zhao, Ming Liu, Zhao Gong, Yi School of Automation Beijing Information Science and Technology University Beijing100192 China Beijing Information Science and Technology University Ministry of Education Key Laboratory of Modern Measurement & Control Technology Beijing100101 China Tsinghua University Beijing National Research Center for Information Science and Technology Beijing100084 China Tsinghua University Department of Electronic Engineering Beijing100084 China

ISBN: (纸本)9798350317923

With the rapid increase in demand for the fifth-generation mobile communication technology (5G) in the BusinesstoBusiness (ToB) market, future factories, especially those involving a large number of Internet of Things (IoT) devices, will prioritize deploying private networks to achieve prioritized scheduling, resource allocation, and security control over the entire network. The User Plane Function (UPF) is an important network element in the 5G core network. In practical deployments, UPF typically uses dedicated hardware devices, which are not only expensive but also have a tightly coupled architecture that imposes certain limitations on future network upgrades and scalability. To achieve flexible deployment of Network Private Network (NPN), we implemented the 5G core network architecture using Software Defined Networking (SDN) with Programming Protocol-Independent Packet Processors (P4) programmable switch. Subsequently, we conducted the connectivity test of the core network and analyzed the maximum achievable user capacity. Considering that the introduction of SDN may bring new security risks to private networks, we have designed a solution to mitigate SDN data plane Distributed Denial of Service (DDoS) attacks and have proven its effectiveness through practical experiments. © 2023 IEEE.

关键词： Network security

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Output-Feedback Adaptive Neural Network control for Uncertain Nonsmooth Nonlinear Systems With Input Deadzone and Saturation

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IEEE Transactions on Cybernetics 2023年第9期53卷 5957-5969页

作者： Zong, Guangdeng Xu, Qian Zhao, Xudong Su, Shun-Feng Song, Limei Tiangong University School of Control Science and Engineering The Tianjin Key Laboratory of Intelligent Control of Electrical Equipment Tianjin300387 China Tiangong University School of Control Science and Engineering Tianjin300387 China Qufu Normal University School of Engineering Rizhao276826 China Dalian University of Technology Faculty of Electronic Information and Electrical Engineering Dalian116024 China National Taiwan University of Science and Technology Department of Electrical Engineering Taipei106 Taiwan

Nonsmooth nonlinear systems can model many practical processes with discontinuous property and are difficult to be stabilized by classical control methods like smooth nonlinear systems. This article considers the output-feedback adaptive neural network (NN) control problem for nonsmooth nonlinear systems with input deadzone and saturation. First, the nonsmooth input deadzone and saturation is converted to a smooth function of affine form with bounded estimation error by means of the mean-value theorem. Second, with the help of approximation theorem and Filippov's differential inclusion theory, the given nonsmooth system is converted to an equivalent smooth system model. Then, by introducing a proper logarithmic barrier Lyapunov function (BLF), an output-feedback adaptive NN strategy is set up by constructing an appropriate observer and adopting the adaptive backstepping technique. A new stability criterion is established to guarantee that all the signals in the closed-loop system are semiglobally uniformly ultimately bounded (SGUUB). Finally, comparative simulations through Chua's oscillator are offered to verify the effectiveness of the proposed control algorithm. © 2013 IEEE.

关键词： Stability criteria

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Analysis of Energy Efficiency Characteristics of Gravity Energy Storage System

Analysis of Energy Efficiency Characteristics of Gravity Ene...

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2024 IEEE International Conference on Electrical Energy Conversion Systems and control, IEECSC 2024

作者： Wang, Yuxuan Wang, Yilong Gao, Tian Dong, Linlin Zhang, Liancheng Ma, Xudong Wang, Zufan Zhao, Haisen School of Electromechanical Engineering Beijing Information Science and Technology University Beijing China School of Electrical and Electronic Engineering North China Electric Power University Beijing China School of Electronic and Control Engineering North China Institute of Aerospace Engineering Langfang China

ISBN: (纸本)9798350389357

Gravity energy storage (GES) has the advantages of high environmental adaptability, long life, high environmental protection, which have attracted the attention of more and more scholars in recent years. Efficiency is one of the key technical indicators for the large-scale promotion of energy storage. Since GES is in its infancy and the system structure is complex, the detailed and engineering practical analysis of the efficiency of GES is still in a blank stage. In response to the above problems, this paper proposes a method for establishing an efficiency simulation model. This model is based on the mechanical and electrical combination of the heavy block driving torque within the typical structure of GES. Through simulation analysis, the efficiency characteristics and the law of the loss ratio of the system are revealed: GES typical structure is rated at about 76%, of which the mechanical link loss accounts for the largest proportion of about 61 %, and the loss has a linear characteristic, while the single equipment motor loss is the largest, about 39%, and the loss of a single equipment is sorted from large to small as: motor, gearbox, chain, heavy block, drum and coupling. © 2024 IEEE.

关键词： Storage efficiency

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Research on Multi-peaks Non-fuzzy Tracking Algorithm of BOC Signal Based on Improved Bump-jumping Method 2021

Research on Multi-peaks Non-fuzzy Tracking Algorithm of BOC ...

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5th International Conference on Digital Signal Processing, ICDSP 2021

作者： Wang, Shujun Liu, Jiang Liu, Zhenyang Li, Pengcheng Ran, Yihang Science and Technology on Electronic Information Control Laboratory China

ISBN: (纸本)9781450389365

The GPS-III navigation signal adopts the BOC modulation mode. The signal modulated by BOC will have multiple subpeaks when it is captured and tracked, so there is a large error caused by the subpeak wrong locked in the time delay difference measurement. In this paper, the bump-jumping algorithm is proposed, which can quickly identify the subpeak and ensure that the PLL is ready to lock the main peak. After locking the main peak, the algorithm is not easy to be disturbed and lead to loss of lock. Finally, the high-precision tracking of non-fuzzy BOC signal can be realized by using bump-jumping tracking algorithm. © 2021 ACM.

关键词： Modulation

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Geographical information-Specific Emulator with EM Propagation Modeling 13

Geographical Information-Specific Emulator with EM Propagati...

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13th International Symposium on Antennas, Propagation and EM Theory, ISAPE 2021

作者： Fang, Jian Li, Qiqin Liu, Jiang Zhu, Jiehao Zhu, Yu Science and Technology on Electronic Information Control Laboratory China

ISBN: (纸本)9781665418126

A Geographical information- specific configuration for multiple emitter emulator is introduced in this paper. Using the EM wave environment-specific propagation modeling method during the process of signal generation and modulation, can help increase the fidelity of the EM spectrum status simulation in actual operation. © 2021 IEEE.

关键词： Electromagnetic waves

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Transition Method for Creeping Ray Tracing on NURBS Patches 4

Transition Method for Creeping Ray Tracing on NURBS Patches

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4th International Applied Computational Electromagnetics Society Symposium in China, ACES-China 2021

作者： Chen, Xi Guo, Lan-Wei Xue, Jing-Yang Ying, Hong-Jun Song, Yuan Science and Technology on Electronic Information Control Laboratory China

ISBN: (纸本)9781733509619

In the paper, a transition method is developed for calculation of creeping ray tracing on NURBS patches. This transition method is presented in the paper for the transitions of creeping rays between adjacent parametric surface patches when creeping rays propagate on several patches. The precision of the transition method can be proved by the calculated results. © 2021 Applied Computational Electromagnetics Society (ACES).

关键词： Ray tracing

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Positioning Error Characteristics of GPS/INS Integrated Navigation under Different Number of Visible Satellites 2021

Positioning Error Characteristics of GPS/INS Integrated Navi...

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5th International Conference on Digital Signal Processing, ICDSP 2021

作者： Liu, Bo Zhang, Li Li, Pengcheng Li, Jin He, Zhongxiang Science and Technology on Electronic Information Control Laboratory China

ISBN: (纸本)9781450389365

Number of visible satellites and mask angle of the GPS satellites are two major factors to influence positioning error characteristics of GPS/INS integrated navigation. For GPS signals, there are shading effects in urban canyons and forest environments. Based on the positioning error characteristics of GPS/INS integrated navigation model, with the different number of the visible satellites under the influence of mask angle, the simulation of positioning error RMS with different number of the visible satellites is provided. At the same time, the characteristics of the simulation results are analyzed in detail. Some theoretical references for the influence of mask angle to the GPS/INS integrated navigation performance are provided. © 2021 ACM.

关键词： Satellites

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Attitude solving method based on fusion of Madgwick and EFK 38

Attitude solving method based on fusion of Madgwick and EFK

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38th Youth Academic Annual Conference of Chinese Association of Automation, YAC 2023

作者： Kong, Mingjun Li, Shengming Lv, Zongyang Dalian University of Technology School of Electronic Information and Electrical Engineering Dalian China Dalian University of Technology School of Innovation and Entrepreneurship Dalian China Dalian University of Technology School of Control Science and Engineering Dalian China

ISBN: (纸本)9798350303636

A fusion algorithm combing Madgwick and extended Kalman filter (EKF) is proposed to solve the problem of low accuracy of micro inertial measurement unit and significant error of traditional attitude solution method. Firstly, the inertial measurement sensor data is fused with the madgwick filter, by solving which the initial attitude quaternion is obtained. Using the quaternion as the measurement information of EKF, then establishing its state equation according to the angular velocity and acceleration information measured by the sensor. Finally, the solution information of attitude is obtained by EKF filtering. The experimental results show that compared with the traditional algorithm, the improved fusion algorithm can restrain the errors caused by the drastic changes of the accelerometer more effectively, which can filter the non-gravity acceleration noise well in both static and dynamic conditions and improve the speed and accuracy of the attitude solution. © 2023 IEEE.

关键词： Attitude solution data fusion extended Kalman filter Madgwick filter

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Self-supervised Visual Odometry Based on Geometric Consistency

Self-supervised Visual Odometry Based on Geometric Consisten...

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IEEE International Symposium on Circuits and Systems (ISCAS)

作者： Rujun Song Jiaqi Liu Kaisheng Liao Zhuoling Xiao Bo Yan School of Information and Communication Engineering University of Electronic Science and Technology of China Science and Technology on Electronic Information Control Laboratory Chengdu China

Learning-based monocular visual odometry (VO) has lately drawn significant attention for its robustness to camera parameters and environmental variations. Unlike most self-supervised learning-based methods, our approach simultaneously focuses on the adjacent and interval co-visibility correspondence to improve the pose estimation. To handle different pixel displacements, we apply the Multi-scale Feature Fusion component for the full exploration of latent motion features. Besides, the Interval Feature Guided Refinement component is incorporated to adaptively exploit the continuity of camera motions and steer the network for retaining pose consistency in the time domain. Extensive experiments on the KITTI and Malaga datasets have demonstrated the promising performance of our approaches. The proposed method produces competitive results against classic algorithms and outperform state-of-the-art methods by up to 23.9 % and 15.4 % on average translational and rotational evaluation.

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On Finite Word Length Computing Error of Fixed-Point SAR Imaging Processing*

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Chinese Journal of electronics 2025年第3期23卷 645-648页

作者： Yizhuang Xie Bocheng Zhu Wen Yan Weijie Zhang School of Information and Electronics Beijing Institute of Technology Beijing China School of Electronics Engineering and Computer Science Peking University Beijing China Science and Technology on Electronic Information Control Laboratory Chengdu China

Synthetic aperture radar (SAR) imaging system is generally realized by fixed-point with the purpose of reducing system implementation scale and enhancing real-time performance. Finite word length computing error of fixed-point SAR imaging system is studied. The characteristic of computing error in SAR imaging system is analyzed. A finite word length computing error model of SAR imaging system is built, by means of which the empirical formula of system's output noise-to-signal ratio is derived. Based on the empirical formula, SAR imaging system processing word length is presented according to different processing granularities. The validity of this proposed finite word length computing error model of SAR imaging system is verified by system level fixed-point simulation.

关键词： Computational modeling Imaging Transforms Radar polarimetry Real-time systems Synthetic aperture radar System implementation

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