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Client selection and resource scheduling in reliable federated learning for UA V-assisted vehicular networks

Chinese Journal of Aeronautics 2024年第9期37卷 328-346页

作者： Hongbo ZHAO Liwei GENG wenquan feng ChangmingZHOU School of Electronics and Information Engineering Beihang UniversityBeijing 100191China

Federated Learning(FL),a promising deep learning paradigm extensively deployed in Vehicular Edge Computing Networks(VECN),allows a distributed approach to train datasets of nodes locally,e.g.,for mobile vehicles,and exchanges model parameters to obtain an accurate model without raw data ***,the existence of malicious vehicular nodes as well as the inherent heterogeneity of the vehicles hinders the attainment of accurate ***,the local model training and model parameter transmission during FL exert a notable energy burden on vehicles constrained in *** view of this,we investigate FL client selection and resource management problems in FL-enabled UAV-assisted Vehicular Networks(FLVN).We first devise a novel reputation-based client selection mechanism by integrating both data quality and computation capability metrics to enlist reliable high-performance ***,to fortify the FL reliability,we adopt the consortium blockchain to oversee the reputation informa-tion,which boasts tamper-proof and interference-resistant ***,we formulate the resource scheduling problem by jointly optimizing the computation capability,the transmission power,and the number of local training rounds,aiming to minimize the cost of clients while guaranteeing *** this end,we propose a reinforcement learning algorithm employing an asynchronous parallel network structure to achieve an optimized scheduling *** results show that our proposed client selection mechanism and scheduling algorithm can realize reliable FL with an accuracy of 0.96 and consistently outperform the baselines in terms of delay and energy consumption.

关键词： Federated learning Vehicular edge computing Resource management Reinforcement learning Optimization techniques

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一种终端间隙结构的波导缝隙阵列平板天线

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海军工程大学学报 2024年第4期36卷 86-91页

作者：翟龙军褚子清冯文全王义冬海军航空大学山东烟台264001 航天恒星科技有限公司北京100086 北京航空航天大学电子信息工程学院北京100083 海军研究院北京100071

为降低传统的波导缝隙阵列平板天线加工难度,提高环境适应性,分析了波导终端间隙结构对辐射波导输入阻抗的影响,提出了一种终端间隙结构的波导缝隙阵列平板天线,并给出了设计方法及22×4阵元Ka波段阵列的仿真结果。仿真结果表明:终端间... 详细信息

为降低传统的波导缝隙阵列平板天线加工难度,提高环境适应性,分析了波导终端间隙结构对辐射波导输入阻抗的影响,提出了一种终端间隙结构的波导缝隙阵列平板天线,并给出了设计方法及22×4阵元Ka波段阵列的仿真结果。仿真结果表明:终端间隙尺寸较小时,终端间隙结构的波导缝隙阵列天线与传统的波导缝隙阵列天线性能基本一致;终端间隙结构的阵列在生产加工、环境适应性方面,具有较好的优势。

关键词：终端间隙结构波导缝隙阵列天线平板天线

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Pose matters:Pose guided graph attention network for person re-identification

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Chinese Journal of Aeronautics 2023年第5期36卷 447-464页

作者： Zhijun HE Hongbo ZHAO Jianrong WANG wenquan feng School of Electronics and Information Engineering Beihang UniversityBeijing 100191China Hefei Innovation Research Institute of Beihang University Hefei 230012China

Person re-Identification(reID),aiming at retrieving a person across different cameras,has been playing a more and more important role in the construction of smart city and social *** deep-learning-based reID methods,it has been proved that using local feature together with global feature could help to give robust representation for person *** pose information can provide the locations of human skeleton to effectively guide the network to pay more attention to these key areas,and can also help to reduce the noise distractions from background or *** on human pose,a Pose Guided Graph Attention(PGGA)network is proposed in this paper,which is a multi-branch architecture consisting of one branch for global feature and two branches for local key-point features.A graph attention convolution layer is carefully designed to re-assign the contribution weight of each extracted local feature by modeling the similarity *** experimental results demonstrate the effectiveness of our approach on discriminative feature *** model achieves the state-of-the-art performance on several mainstream evaluation datasets.A plenty of ablation studies and different kinds of comparison experiments are conducted to prove the effectiveness of this work,including the tests on occluded datasets and cross-domain ***,we further design supplementary tests in practical scenario to indicate the advantage of our work in real-word applications.

关键词： Convolutional neural networks Deep learning Graph neural networks Identification Image retrieval Image processing

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Integration of GPS and low cost INS for pedestrian navigation aided by building layout

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Chinese Journal of Aeronautics 2013年第5期26卷 1283-1289页

作者： feng wenquan Zhao Hongbo Zhao Qi Li Jingwen School of Electronics and Information Engineering Beihang University

In outdoor environments, GPS is often used for pedestrian navigation by utilizing its signals for position computation, but in indoor or semi-obstructed environments, GPS signals are often unavailable. Therefore, pedestrian navigation for these environments should be realized by the integration of GPS and inertial navigation system （INS）. However, the lowcost INS could induce errors that may result in a large position drift. The problem can be minimized by mounting the sensors on the pedestrian＇s foot, using zero velocity update （ZUPT） method with the standard navigation algorithm to restrict the error growth. However, heading drift still remains despite using ZUPT measurements since the heading error is unobservable. Also, tbot mounted INS suffers from the initialization ambiguity of position and heading from GPS. In this paper, a novel algorithm is developed to mitigate the heading drift problem when using ZUPT. The method uses building lay- out to aid the heading measurement in Kalman filter, and it could also be combined for the initial- ization. The algorithm has been investigated with real field trials using the low cost Microstrain 3DM-GX3-25 inertial sensor, a Leica GS10 GPS receiver and a uBlox EVK-6T GPS receiver. It could be concluded that the proposed method offers a significant improvement in position accuracy for the long period, allowing pedestrian navigation for nearly40 min with mean position error less than 2.8 m. This method also has a considerable effect on the accuracy of the initialization.

关键词： Heading drift Initialization Integrated navigation Pedestrian navigation Satellite navigation Zero velocity update

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A novel particle filter approach for indoor positioning by fusing WiFi and inertial sensors

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Chinese Journal of Aeronautics 2015年第6期28卷 1725-1734页

作者： Zhu Nan Zhao Hongbo feng wenquan Wang Zulin School of Electronics and Information Engineering Beihang University

WiFi fingerprinting is the method of recording WiFi signal strength from access points （AP） along with the positions at which they were recorded, and later matching those to new mea- surements for indoor positioning. Inertial positioning utilizes the accelerometer and gyroscopes for pedestrian positioning. However, both methods have their limitations, such as the WiFi fluctuations and the accumulative error of inertial sensors. Usually, the filtering method is used for integrating the two approaches to achieve better location accuracy. In the real environments, especially in the indoor field, the APs could be sparse and short range. To overcome the limitations, a novel particle filter approach based on Rao Blackwellized particle filter （RBPF） is presented in this paper. The indoor environment is divided into several local maps, which are assumed to be independent of each other. The local areas are estimated by the local particle filter, whereas the global areas are com- bined by the global particle filter. The algorithm has been investigated by real field trials using a WiFi tablet on hand with an inertial sensor on foot. It could be concluded that the proposed method reduces the complexity of the positioning algorithm obviously, as well as offers a significant improvement in position accuracy compared to other conventional algorithms, allowing indoor positioning error below 1.2 m.

关键词： Fusion algorithm Indoor positioning Inertial sensor Rao Blackwellized par ticle filter WiFi fingerprinting

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Dual-channel Method for Fast Long PN-code Acquisition

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China Communications 2014年第5期11卷 60-70页

作者： feng wenquan XING Xiaodi ZHAO Qi WANG Zulin School of Electronic and Information Engineering Beihang University Haidian 100191 Beijing P. R. China

Long PN-code acquisition is a difficult and time-consuming task due to long code *** accelerate acquisition,folding methods like XFAST are widely *** highdynamic environment however,the application of those methods are largely restricted due to nonnegligible residual *** paper proposes a new dual-channel method for fast acquisition of long *** the proposed method,both non-overlapping local PNcode blocks are employed to correlate with input sample block;the detection process is eased through finding the maximum value among correlation results and verification is made with all the full and partial peaks taken into *** alarm probabilities from analysis of the verification process are *** theoretical and Monte Carlo simulations reveal that,with respect to acquisition probability and mean acquisition time under the same false alarm rate,dual-channel method has advantage over zero-padding and XFAST based folding methods under certain false alarm probabilities.

关键词： spread spectrum long PN-code code acquisition detection probability

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A novel polyionic liquid with lubricity and viscosity-increasing dual functionalities as the additive in aqueous lubrication system

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Friction 2024年第4期12卷 698-710页

作者： Bo YU Kun ZOU Rui WANG Qiang CHEN Rui DONG Xiao LIU Jiaying ZHANG wenquan LV Qiangliang YU Meirong CAI feng ZHOU College of Science Nanjing Forestry UniversityNanjing 210037China State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China Shandong Laboratory of Advanced Materials and Green Manufacturing at Yantai Yantai 264006China Yantai Zhongke Research Institute of Advanced Materials and Green Chemical Engineering Yantai 264006China Institute of Polymer Materials Nanjing Forestry UniversityNanjing 210037China

The polyionic liquid poly-PEGMA-r-METAC(PPM)with quaternary ammonium has been synthesized and evaluated as additive in aqueous lubricating *** rheological behavior of aqueous lubricating fluids with PPM has been characterized to confirm PPM’s function as a viscosity *** tribological behavior of aqueous lubricating fluids with PPM has been investigated on SRV-V and MTM testing *** was found that PPM has excellent viscosity-increasing,lubricating,and anti-wear properties as an additive for aqueous,which can be attributed to the ability of PPM to form the protective film and boundary tribofilm generated from complex tribochemical reaction on rubbing *** obtained PPM with dual functions of anti-corrosion additives and viscosity index improver can play an important role in diverse lubrication regimes.

关键词： polyionic liquid lubricant additives viscosity modifier lubrication regime

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Design and Simulation of Synchronization Algorithm for Short Time Burst-Mode GMSK Signal

Design and Simulation of Synchronization Algorithm for Short...

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第九届中国卫星导航学术年会

作者： Guoshuai Ren wenquan feng Xi Liu Beihang University

The AIS(Automatic Identification System)is a marine monitoring system with means of detection capabilities,providing multi-user applications for offshore *** satellite-based AIS system send the received AIS signals for analysis by one or more low orbit *** satellite-based AIS is a new navigation aid system which can be used as a complement to navigation *** AIS system is a Non-real-time communication system,using GMSK *** reception of short time burst AIS signal is facing frame synchronization,Doppler shift compensation,phase compensation,delay spread and other *** paper describes an innovative synchronization algorithm for the short burst-mode GMSK *** are several advantages of this synchronization *** signal is processed in real *** voids the loss of data caused by commonly used loop *** devised algorithm provides an excellent performance against noise,delay spread,frequency offset and phase *** demodulator using this synchronization algorithm shows that the bit error’s performance degradation is only about 0.3 dB.

关键词： short burst-mode GMSK signal detection frequency offset estimation phase offset estimation timing synchronization

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卫星扩频应答机的伪码快捕方法

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北京航空航天大学学报 2010年第9期36卷 1017-1020,1025页

作者：冯文全张德智北京航空航天大学电子信息工程学院北京100191

在低地球轨道通信系统中,由于系统的高动态,使扩频应答机接收的信号附加了几十千赫兹的多普勒频移,传统的伪码捕获方法很难完成捕获.对此提出了一种部分相关和FFT(Fast Fourier Transform)相结合的捕获方法,利用FFT补偿多普勒造成的相... 详细信息

在低地球轨道通信系统中,由于系统的高动态,使扩频应答机接收的信号附加了几十千赫兹的多普勒频移,传统的伪码捕获方法很难完成捕获.对此提出了一种部分相关和FFT(Fast Fourier Transform)相结合的捕获方法,利用FFT补偿多普勒造成的相关峰损失,在搜索码相位的同时得到多普勒频移的估计,减少了捕获时间.给出了捕获系统的结构,分析了FFT对相关峰的补偿性能,给出了部分相关和FFT的参数设计方法,使用了自适应门限技术,以满足输入信号载噪比大幅变化的情况下实现伪码的捕获判决.理论分析和仿真结果表明:该方法可以在高多普勒频移和低载噪比环境下实现伪码的快速捕获,比其他快捕方法占用更少的FPGA(Field Programmable Gate Arrays)资源.

关键词：扩频通信应答机多普勒影响快速傅里叶变换

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基于CompactPCI的多路遥测信号模拟源的设计与实现

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北京航空航天大学学报 2005年第9期31卷 1036-1039页

作者：冯文全张晓林北京航空航天大学电子信息工程学院北京100083

对CompactPCI总线和其他主要的工业计算机总线进行了分析和比较,研究了基于CompactPCI总线的多路遥测信号模拟源的一些关键技术,并对多路遥测信号模拟源的底层软件接口进行了说明.基于CompactPCI总线平台的某卫星测控系统综合测试环境... 详细信息

对CompactPCI总线和其他主要的工业计算机总线进行了分析和比较,研究了基于CompactPCI总线的多路遥测信号模拟源的一些关键技术,并对多路遥测信号模拟源的底层软件接口进行了说明.基于CompactPCI总线平台的某卫星测控系统综合测试环境需要产生大量的传感器仿真信号作为遥测源,如果使用传统的采样保持电路和DA组合方式将难以在一个6U的CompactPCI板卡上实现多达128路的DA输出.围绕Analog Devices公司的8通道10bits串行控制DA芯片AD5318,通过简单的接口电路直接实现与CompactPCI接口芯片连接,大大缩减了板卡上器件,成功的实现了128路的DA输出.同时,设计还在板卡上实现了一个以16bits AD为核心的高精度反馈回路,以便对各通道的输出实现动态的监控和调整,保证了DA精度和验证遥测采集系统的性能.

关键词：遥测仿真遥测信号总线

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