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2021 IEEE 4th Advanced Information Management, Communicates, Electronic and Automation Control Conference (IMCEC)最新文献

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Study on the propagation characteristics of the electromagnetic wave across water film on the surface of the towed antenna 电磁波在拖曳天线表面水膜上的传播特性研究
Shiyu Wang, Lihua Li, Tianhui Fu, S. Feng, Yongbin Wang
Based on Maxwell equations, the propagation characteristics of electromagnetic waves across the three layers of the air-water-film-towed cable propagation medium were analyzed, the effect of the antenna's proximity to the medium was proved, and the influence of the seawater film attached to the outside of the towed cable on the reception performance of the towed antenna was obtained, and the FEKO electromagnetic simulation software was used for example verification.
基于Maxwell方程,分析了电磁波在三层空气-水膜拖曳电缆传播介质中的传播特性,验证了天线与介质接近度的影响,得到了拖曳电缆外部附着海水膜对拖曳天线接收性能的影响,并利用FEKO电磁仿真软件进行了实例验证。
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引用次数: 0
Radar Emitter Signal Recognition based on Contour Lines of Ambiguity Function and Stacked Denoising Auto-encoders 基于模糊函数等高线和叠置去噪自编码器的雷达发射信号识别
Yunwei Pu, Jiang Guo, Taotao Liu, Haixiao Wu
Aiming at many problems of complex radar emitter signal recognition methods, like poor anti-noise performance and low recognition rate. In this paper, a new recognition method based on contour lines of ambiguity function and stacked denoising auto-encoders is proposed. First, an ambiguity function is processed by the Gaussian smoothing and calculate contour lines by linear interpolation. Then, principal component analysis is used to reduce its feature dimension, retain the main ambiguity energy information. Finally, deep learning stacked denoising auto-encoders are built to learn and extract the deep and more ubiquitous features of contour lines, and classify them through the Softmax classifier. The simulated experiments show that the overall average recognition rate of the six typical radar signals is maintained above 99.83% when the signal-noise ratio is 0dB. Even in the -6dB environment, it also can reach 83.67%, which proves this method has good performance and feasibility under the extremely low signal-noise ratio conditions.
针对复杂雷达辐射源信号识别方法存在的抗噪声性能差、识别率低等问题。本文提出了一种基于模糊函数轮廓线和叠置去噪自编码器的图像识别方法。首先对模糊函数进行高斯平滑处理,并用线性插值法计算轮廓线;然后,利用主成分分析对其特征维数进行降维,保留主模糊能量信息;最后,构建深度学习堆叠去噪自编码器,学习提取轮廓线的深度特征和更普遍的特征,并通过Softmax分类器对其进行分类。仿真实验表明,当信噪比为0dB时,6种典型雷达信号的总体平均识别率保持在99.83%以上。即使在-6dB环境下,也能达到83.67%,证明了该方法在极低信噪比条件下具有良好的性能和可行性。
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引用次数: 0
An Improved Global State Fusion Filter for Track Estimation 一种改进的航迹估计全局状态融合滤波器
Xia Keqiang, Xing Meng, Fu Na, Wei Jun, Liang Jixin, Yang Yongan, Li Ganhua
According to the characteristics of target motion and composite guidance, this paper establishes the state motion equation, designs the global state feedback model based on Kalman filter method and proposes an improved track fusion estimation method of the moving target on the sea by introducing the scalar weighting optimal state fusion. The method avoids the matrix inverse operation, so it significantly reduces the computational amount and effectively improves the timeliness in multi-mode composite guidance engineering. Simulation results of active and passive radar composite guidance show that this method can effectively reduce the computation amount and meet the time limitation requirement of composite guidance under conditions of ensuring the precision of track estimation.
根据目标运动和复合制导的特点,建立了状态运动方程,设计了基于卡尔曼滤波的全局状态反馈模型,引入标量加权最优状态融合,提出了一种改进的海上运动目标航迹融合估计方法。该方法避免了矩阵逆运算,大大减少了计算量,有效提高了多模态复合制导工程的实时性。主被动雷达复合制导仿真结果表明,该方法在保证航迹估计精度的前提下,能有效减少计算量,满足复合制导的时间限制要求。
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引用次数: 0
Research on Adaptive Reclosing of Distribution Network based on Signal Injection 基于信号注入的配电网自适应重合闸研究
Xiaomeng Wu, Tao Zhang
Without discriminating the nature of faults, the traditional three-phase reclosing performs after set time, so the failure of reclosing will result in a secondary impact on the system. In order to avoid the damage of secondary impact caused by reclosing onto a permanent fault and increase the successful rate of reclosing, the application of adaptive reclosing technology for transmission lines has been relatively common, and the development of adaptive reclosing technology for distribution lines has been relatively slow. The adaptive reclosing technology of distribution network based on signal injection is studied in this paper. Compared with the fault nature identification method based on the electrical characteristics of the fault itself, the scheme of adaptive reclosing technology based on additional injection of trial signal in the primary system has the advantage of not being limited by the structure and parameter characteristics of the distribution line itself, which can fundamentally overcome the difficulties faced by the fault property identification method based on the electrical characteristics or arc characteristics of the line fault recovery stage.
传统三相重合闸不区分故障性质,在设定时间后才进行,重合闸失效会对系统产生二次影响。为了避免对永久故障重合闸造成二次冲击的破坏,提高重合闸的成功率,输电线路自适应重合闸技术的应用已经比较普遍,配电线路自适应重合闸技术的发展相对缓慢。研究了基于信号注入的配电网自适应重合闸技术。与基于故障本身电气特性的故障性质识别方法相比,基于在一次系统中附加注入试验信号的自适应重合闸技术方案具有不受配电线路本身结构和参数特性限制的优点;这可以从根本上克服基于线路故障恢复阶段的电气特性或电弧特性的故障属性识别方法所面临的困难。
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引用次数: 0
Based on the improved YOLOV3 small target detection algorithm 基于改进的YOLOV3小目标检测算法
Fengling Wang, J. Su
Target detection is one of the core problems in the field of machine vision. However, the different appearance, shape, and size of objects and the influence of interference factors such as illumination and occlusion during the imaging process pose a considerable challenge to the task of target detection. This article introduces YOLOV3 network structure and related research, proposes a small target detection algorithm based on improved YOLOV3, describes the flow of YOLOV3 model to achieve small target detection algorithm, analyzes the experiment and results, and summarizes the problems in the implementation process and shortcomings, provide a reference for the continuous improvement of small target detection in the future.
目标检测是机器视觉领域的核心问题之一。然而,在成像过程中,物体的不同外观、形状和大小以及光照和遮挡等干扰因素的影响给目标检测任务带来了相当大的挑战。本文介绍了YOLOV3网络结构及相关研究,提出了一种基于改进YOLOV3的小目标检测算法,描述了YOLOV3模型实现小目标检测算法的流程,分析了实验和结果,总结了实现过程中存在的问题和不足,为今后小目标检测的不断改进提供参考。
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引用次数: 5
Research on Road-Network Traversal of Fixed-Wing Multi-UAV in Urban Environment 城市环境下多架固定翼无人机路网穿越研究
Tianhe Lu, Li Liu
Road-network plays an important role in urban environment, so the reconnaissance along it should be attached much attention. However, the complexity of the road-network brings a lot of difficulties. In this paper, considering the constraints of road-network adjacent relationship and turn radius of fixed-wing UAV, we defined the problem model, including the road-network model with the description for different kinds of nodes. For road-network traversal problem, this paper proposed a method using improved depth-first search with angle constraint (DFS-AC) and genetic algorithm with double chromosome. The simulation results show that this method is able to solve road-network traversal problem both with and without infeasible nodes, at which fixed-wing UAV has no road to fly along.
路网在城市环境中起着重要的作用,因此对路网沿线的勘测工作应引起重视。然而,路网的复杂性带来了许多困难。考虑到路网相邻关系和固定翼无人机转弯半径的约束,定义了问题模型,包括路网模型和对不同类型节点的描述。针对路网遍历问题,提出了一种基于角度约束的改进深度优先搜索(DFS-AC)和双染色体遗传算法的方法。仿真结果表明,该方法能够解决固定翼无人机无路可飞的无可行节点和无不可行的路网穿越问题。
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引用次数: 0
An On-demand Routing Update Acquisition in Named-data Link State Routing Protocol 命名数据链路状态路由协议中按需路由更新获取
Mengze Yuan, Yu Zhang, Yuanchen Hao
Advantages in multi-path forwarding, in-network caching, as well as information centric architecture, have made Named Data Networking (NDN) a great supporter for mobile scenarios, where rapid link changes need to be propagated timely to other nodes to maintain a consistent view of the topology. How to reduce routing overhead and keep convergence time within an acceptable range have become an urgent issue. In this paper, we propose routing update acquisition delay based on the location of topology change. Node centrality is used to set different timers for fetching Link State Advertisement (LSA), so as to reduce large overhead caused by simultaneously broadcasting LSA Interest. Simulation shows that routing overhead reduction is more obvious when link changes rapidly. At the same time, since the delayed LSA Interest can return data directly from in-network cache, convergence time is also kept within a small range.
在多路径转发、网络内缓存以及以信息为中心的架构方面的优势,使命名数据网络(NDN)成为移动场景的重要支持者,在移动场景中,快速的链路更改需要及时传播到其他节点,以保持拓扑视图的一致性。如何减少路由开销并使收敛时间保持在可接受的范围内已成为一个迫切需要解决的问题。本文提出了基于拓扑变化位置的路由更新获取延迟。节点中心性是为获取LSA设置不同的定时器,以减少同时广播LSA兴趣带来的巨大开销。仿真结果表明,当链路变化较快时,路由开销的降低更为明显。同时,由于延迟的LSA利息可以直接从网络内缓存返回数据,因此收敛时间也保持在较小的范围内。
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引用次数: 1
A Novel Blind Detection Algorithm Based on Multi-Clustering Complex Neural Network 一种基于多聚类复杂神经网络的盲检测新算法
Jinwen Wu, Hai-Hong Jin, Shujuan Yu, Yun Zhang
Aiming at solving the problems that the CHNN-RIHM (Complex-valued Hopfield Neural Network Real-Imaginary-type Hard-Multistate-activation-function) is easy to get into a local optimization and requires a large amount of data, we propose to use Signal Blind Detection Algorithm Based on MC-CHNN (Multi-Clustering Complex-valued Hopfield Neural Network), construct a new energy function and prove the stability of MC-CHNN. The optimization scheme of MC-CHNN is as follows: we use a piecewise annealing function to improve the convergence speed of blind detection. To further reduce the complexity of the MC-CHNN algorithm and improve the sensitivity of MC-CHNN, we propose to apply a new activation function called the multi-clustering function to MC-CHNN and replace the activation function of CHNN-RIHM with multi-clustering function when dealing with discrete multilevel signals. The simulation results show that the MC-CHNN has a faster convergence speed, stronger anti-noise capability, and can be better applied to low SNR than its competitors.
针对复值Hopfield神经网络实数型硬多态激活函数(CHNN-RIHM)易陷入局部最优且需要大量数据的问题,提出采用基于多聚类复值Hopfield神经网络(MC-CHNN)的信号盲检测算法,构造新的能量函数并证明MC-CHNN的稳定性。MC-CHNN的优化方案如下:采用分段退火函数提高盲检测的收敛速度。为了进一步降低MC-CHNN算法的复杂度,提高MC-CHNN的灵敏度,我们提出在MC-CHNN中引入一种新的激活函数——多聚类函数,并在处理离散多电平信号时用多聚类函数代替CHNN-RIHM的激活函数。仿真结果表明,MC-CHNN具有更快的收敛速度和更强的抗噪能力,能够更好地应用于低信噪比的环境。
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引用次数: 0
Research of Improved MRAS Based Sensorless Control of Permanent Magnet Synchronous Motor Considering Parameter Sensitivity 考虑参数灵敏度的改进型MRAS永磁同步电机无传感器控制研究
Y. Ni, Dingguo Shao
PMSM sensorless control performance is largely affected by the accuracy of rotor position estimation. In this paper, MRAS method is used in the PMSM sensorless control, the position estimation of traditional MRAS sensorless method is sensitive to parameter variation during the operation of PMSM. To solve the problem, simulation has been done at first to study the parameter sensitivity of traditional MRAS. Base on the simulation results that variations in inductance and flux linkage have a greater impact on MRAS position estimation, an improved MRAS sensorless method is proposed in this paper. The MRAS adjustable model is updated by the FFRLS parameter identification results in each control cycle. The simulation results show that the improved MRAS position estimator can effectively reduce the influence of parameter variation on rotor position estimation.
永磁同步电机无传感器控制的性能很大程度上取决于转子位置估计的精度。本文将MRAS方法应用于永磁同步电机的无传感器控制中,传统的MRAS无传感器方法的位置估计对永磁同步电机运行过程中参数的变化比较敏感。为了解决这一问题,首先对传统MRAS的参数灵敏度进行了仿真研究。基于电感和磁链变化对MRAS位置估计影响较大的仿真结果,提出了一种改进的MRAS无传感器估计方法。每个控制周期的FFRLS参数辨识结果更新MRAS可调模型。仿真结果表明,改进的MRAS位置估计器能有效降低参数变化对转子位置估计的影响。
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引用次数: 8
Design of Low-power Portable Multi-function Digital Oscilloscope 低功耗便携式多功能数字示波器的设计
Xueli Zhou, Yuke Tian, Jie Shi, N. Zhao, Yu Yang
With the continuous development of integrated circuit technology and digital processing technology, this article designed a portable low-power multifunction digital oscilloscope based on STM32F407ZGT6. The input signal can be processed through the signal conditioning circuit, and the ADC module carried by the main control chip STM32 is used to collect external signals, using a 3.5-inch TFT-LCD to display the processed signal waveform. The added touch screen makes the operation more convenient. The software ported the UCOS-II embedded operating system and the graphical support system UCGUI in embedded applications to form a complete real-time operating system. After actual testing, the oscilloscope has the characteristics of high real-time performance, low power consumption, stable and practical performance. And it has strong practical value and promotion value.
随着集成电路技术和数字处理技术的不断发展,本文设计了一种基于STM32F407ZGT6的便携式低功耗多功能数字示波器。输入信号可以通过信号调理电路进行处理,由主控芯片STM32携带的ADC模块采集外部信号,使用3.5英寸TFT-LCD显示处理后的信号波形。新增触摸屏,操作更加方便。该软件将UCOS-II嵌入式操作系统和嵌入式应用中的图形支持系统UCGUI进行了移植,形成了一个完整的实时操作系统。经实际测试,该示波器具有实时性高、功耗低、性能稳定实用等特点。具有较强的实用价值和推广价值。
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引用次数: 1
期刊
2021 IEEE 4th Advanced Information Management, Communicates, Electronic and Automation Control Conference (IMCEC)
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