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2023 IEEE 6th Information Technology,Networking,Electronic and Automation Control Conference (ITNEC)最新文献

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Microwave Imaging System Based on Synthetic Aperture Radar Algorithm 基于合成孔径雷达算法的微波成像系统
Yuxuan Liao, Zhongyuan Zhou, F. Tian
Microwave holographic imaging is typically used to capture microwave images of targets, which is an significant part of the current field of microwave imaging technology. With the Synthetic Aperture Radar (SAR) imaging algorithm, high-resolution microwave images can be reconstructed, and the intensity of the images qualitatively shows the complex permittivity contrast of the targets. In this paper, we first derive the SAR imaging algorithm, based on the formulation of the experimental parameters and the sample- under-test (SUT), and verify the effectiveness of the imaging algorithm by simulation. Then a microwave imaging system based on SAR algorithm is designed and built according to the required parameters and experimental scheme. the image is constructed by collecting S-parameters with SAR algorithm to obtain a holographic image containing the electromagnetic parameter information of the target.
微波全息成像通常用于捕获目标的微波图像,是当前微波成像技术领域的重要组成部分。利用合成孔径雷达(SAR)成像算法,可以重建高分辨率的微波图像,图像强度定性地反映了目标的复介电常数对比。本文首先推导了基于实验参数和待测样本(SUT)的SAR成像算法,并通过仿真验证了成像算法的有效性。然后根据需要的参数和实验方案,设计并搭建了基于SAR算法的微波成像系统。利用SAR算法采集s参数构建图像,得到包含目标电磁参数信息的全息图像。
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引用次数: 0
Estimation of Benchmark Period for PRF Jitter Signal Based on Cumulative Histogram 基于累积直方图的PRF抖动信号基准周期估计
Chai Heng, Zhang Ying-bo, Wang Jin-Feng
Aiming at signal of PRF jitter radar, the estimation of benchmark period from sparse observation with noise is researched in this paper. For that problem, Casey and Sadler proposed one algorithm called MEA (Modified Euclidean Algorithm), which can adapt to the pre-estimation of benchmark period of TOA sequence with noise when there is no deviation. That algorithm needs to conduct continuous differential calculation and employs the differential value when iteration stops as final estimation of benchmark period. When the observation sparse level is high and SNR is low, that algorithm may obtain ineffective estimation. Aiming at the characteristics of PRF jitter signal, this paper utilizes differential accumulation of each order of TOA sequence to conduct pre-estimation to its benchmark period. That both decreases the cumulative error and makes full use of information gain caused by large amount of jitter points, so as to achieve effective estimation to benchmark period under low SNR and period-noise ratio. Practical tests are conducted to jitter signal of navigation radar to validate the engineering feasibilty of the proposed algorithm.
针对PRF抖动雷达信号,研究了基于噪声稀疏观测的基准周期估计问题。针对这一问题,Casey和Sadler提出了一种称为MEA (Modified Euclidean algorithm)的算法,该算法可以在无偏差的情况下适应有噪声的TOA序列基准周期的预估计。该算法需要进行连续的微分计算,并将迭代停止时的微分值作为基准周期的最终估计。当观测稀疏程度较高而信噪比较低时,该算法可能会得到无效估计。针对PRF抖动信号的特点,利用TOA序列各阶的微分累积对其基准周期进行预估计。这样既减小了累积误差,又充分利用了大量抖动点所带来的信息增益,从而在低信噪比和低周期噪声比下实现对基准周期的有效估计。通过对导航雷达抖动信号的实际测试,验证了所提算法的工程可行性。
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引用次数: 0
Research on high resolution and high frame rate image de-distortion algorithm based on FPGA 基于FPGA的高分辨率、高帧率图像去失真算法研究
Yuankai Zeng, Feng Xu, Yunxing Gong, Sijie Huang
In order to realize real-time and high-speed distortion removal of camera images, a new improved high resolution and high frame rate image distortion based on FPGA is proposed. The traditional method uses four random access memory (RAM) to buffer the distorted image respectively, and then remaps it with the double rate synchronous dynamic random access memory (DDR), which will cause the system to be unable to process high-resolution images at high frame rates. A new RAM buffer architecture and an interpolation module more suitable for Field Programmable Gate Array (FPGA) implementation are proposed, which can improve the system’s ability to process high-speed and high-resolution distorted images in real time within the acceptable range of resources. Compared with the traditional FPGA de-distortion algorithm, the proposed method can de-distortion with the frame rate of 100 fps and the resolution of 3072 x 2048 x 8bit.
为了实现摄像机图像的实时、高速失真去除,提出了一种基于FPGA的改进的高分辨率、高帧率图像失真算法。传统的方法是使用4个随机存取存储器(RAM)分别对失真图像进行缓冲,然后再使用双速率同步动态随机存取存储器(DDR)进行重新映射,这将导致系统无法在高帧率下处理高分辨率图像。为了提高系统在可接受的资源范围内实时处理高速、高分辨率畸变图像的能力,提出了一种更适合FPGA实现的RAM缓冲结构和插值模块。与传统的FPGA去失真算法相比,该方法可以实现帧率为100fps、分辨率为3072 × 2048 × 8bit的去失真。
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引用次数: 0
Spontaneous transport of nanodroplets in 2D nanochannels 纳米液滴在二维纳米通道中的自发输运
Jun Yang, Yujuan Wang, Kedong Bi
Directional transport of droplets is crucial for industrial applications and chemical engineering processes, which has demonstrated considerable promise in several fields, such as microelectromechanical systems and sensor devices. Nevertheless, controlled directional transport of nanodroplets in a 2D nanochannel has yet to be studied. In this work, we report an approach to achieving a self-driven behavior of a nanodroplet in a 2D nanochannel via a strain gradient. Meanwhile, the effect on the movement speed of the nanodroplet of different channel parameters is studied, including the magnitude of the strain gradient, interlayer distance, and interlayer angle of the nanochannel. Furthermore, how the nanochannel materials affect spontaneous movement is also explored. These simulation results are highly expected to shed new light on the study of the directional transport of a nanodroplet and open a new avenue for research on heat dissipation in microelectromechanical systems.
液滴的定向输送对于工业应用和化学工程过程至关重要,在微机电系统和传感器设备等几个领域已经显示出相当大的前景。然而,控制纳米液滴在二维纳米通道中的定向输运尚未研究。在这项工作中,我们报告了一种通过应变梯度在二维纳米通道中实现纳米液滴自驱动行为的方法。同时,研究了不同通道参数对纳米液滴运动速度的影响,包括应变梯度大小、层间距离和纳米通道层间角度。此外,还探讨了纳米通道材料如何影响自发运动。这些模拟结果有望为纳米液滴的定向输运研究提供新的思路,并为微机电系统的散热研究开辟新的途径。
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引用次数: 0
Track Circuit Fault Diagnosis based on APSO-GMM 基于APSO-GMM的轨道电路故障诊断
Mengying Zhao, Fanghao Liu, Bo Sun, Qinghu Meng
In view of the huge track circuit system and various faults, this paper proposes a Gaussian mixture model of particle swarm optimization algorithm with adaptive inertia weight to diagnose various fault modes of track circuit. EM algorithm in Gaussian mixture model is easy to be interfered by initial value and fall into local optimum, which leads to unstable diagnosis results and low diagnostic accuracy. The adaptive inertia weight particle swarm optimization algorithm is used to improve the Gaussian mixture model, find the optimal initial value for the model, and improve the stability and fault diagnosis ability of the model. The experimental results show that the improved model is more stable and accurate than the original model or the improved model using single particle swarm optimization algorithm.
针对轨道电路系统庞大、故障种类繁多的特点,提出了一种具有自适应惯性权值的粒子群优化算法的高斯混合模型,用于轨道电路各种故障模式的诊断。高斯混合模型下的电磁算法容易受到初始值的干扰,陷入局部最优,导致诊断结果不稳定,诊断精度低。采用自适应惯性权重粒子群优化算法对高斯混合模型进行改进,找到模型的最优初始值,提高了模型的稳定性和故障诊断能力。实验结果表明,改进后的模型比原始模型或采用单粒子群优化算法的改进模型更稳定,精度更高。
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引用次数: 0
Fine-Grained Egocentric Action Recognition with Multi-Modal Unsupervised Domain Adaptation 基于多模态无监督域自适应的细粒度自中心动作识别
Xianyuan Liu, Tao Lei, Ping Jiang
Fine-grained egocentric action recognition has made significant progress because of the advancement of supervised learning. Some real-world applications require the network trained on one dataset to perform well on another unlabeled dataset due to the difficulty of annotating new data. However, due to the disparity in dataset distributions, i.e. domain shift, the network is unable to retain its good performance across datasets. Therefore, in this paper, we use unsupervised domain adaptation to address this difficult challenge, i.e. training a model on labeled source data such that it can be directly used on unlabeled target data with the same categories. First, we use Transformer to capture spatial information, and then we propose a temporal attention module to model temporal interdependence. In consideration of the fact that multi-modal data provides more kinds of important information, we build a tri-stream network for spatio-temporal information fusion. Finally, we align source data with target data using adversarial learning. Our network outperforms the baselines on the largest egocentric dataset, the EPIC-KITCHENS-100 dataset.
细粒度自我中心行为识别由于监督学习的进步而取得了重大进展。由于标注新数据的困难,一些现实世界的应用需要在一个数据集上训练的网络在另一个未标记的数据集上表现良好。然而,由于数据集分布的差异,即域转移,网络无法在数据集上保持良好的性能。因此,在本文中,我们使用无监督域自适应来解决这一难题,即在标记的源数据上训练模型,使其可以直接用于具有相同类别的未标记目标数据。首先,我们使用Transformer来捕获空间信息,然后我们提出了一个时间关注模块来建模时间依赖性。考虑到多模态数据可以提供更多种类的重要信息,我们构建了三流网络进行时空信息融合。最后,我们使用对抗性学习将源数据与目标数据对齐。我们的网络在最大的自我中心数据集EPIC-KITCHENS-100数据集上的表现优于基线。
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引用次数: 1
Evaluation Method of Main Transformer Capacity Expansion Scheme in Power Supply Area of 500kV Substation 500kV变电站供电区主变扩容方案评价方法
Gaocai Yang, Xiaofan Su, Yuzheng Xie, Pingjiang Lu, Fula Hou
With the development of the national economy, the power system load is increasing, and the capacity of the generator and the main transformer of the substation is also growing. It is necessary to increase the transformer capacity in the substation power supply area to ensure the power supply capacity of the substation. Based on the short-circuit calculation of the 500kV substation and the N-1 failure analysis of the main transformer, the security margin of the 500kV transformer load rate and the security index of short-circuit current of 220kV bus in the 500kV substation are proposed. Then the limit transmission capacity security margin of 220kV transmission lines in the power supply area and the standard deviation of the grid load of the 500kV main transformer after the expansion scheme adopted is calculated. The main transformer reorganization and expansion schemes are assessed comprehensively and objectively from the above four aspects. Finally, the effectiveness and adaptability of the proposed method are verified by a provincial power grid.
随着国民经济的发展,电力系统负荷越来越大,变电站发电机和主变的容量也越来越大。有必要在变电站供电区增加变压器容量,以保证变电站的供电能力。在500kV变电站短路计算和主变压器N-1失效分析的基础上,提出500kV变压器负载量安全裕度和500kV变电站220kV母线短路电流安全指标。然后计算采用扩容方案后供电区220kV输电线路的极限输电容量安全裕度和500kV主变电网负荷的标准差。从以上四个方面对主变改扩建方案进行了全面、客观的评价。最后,以某省级电网为例,验证了该方法的有效性和适应性。
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引用次数: 0
Analysis of Transmission Characteristics of Loosely Coupled Transformer with S-S Compensation Structure S-S补偿结构松耦合变压器传输特性分析
Zhenzhen Xie, Jieyu Wu, Kuang-wei Zhang, Xin L. Lu, Zefeng Xu, Bo Jin
For the wireless power transmission system constructed by loosely coupled transformer, the transmission characteristics of the system affected by the transformer iron consumption after the addition of S-S type compensation structure are analyzed. The T-type equivalent circuit of the transformer is used to model the system, the output power and efficiency of the system are calculated by impedance analysis method and the maximum power transmission theorem, and the parameter curve of the compensation capacitor which makes the transmission power of the system reach the maximum value is obtained. Different points on the curve are selected for calculation and simulation, and the transmitted power, efficiency and output voltage and current waveform of the system are compared. The reference method of compensation capacitance parameter selection for the infinite power transmission system of loosely-coupled transformer with S-S compensation structure is obtained.
针对由松耦合变压器构成的无线电力传输系统,分析了加入S-S型补偿结构后,变压器铁耗对系统传输特性的影响。利用变压器的t型等效电路对系统进行建模,利用阻抗分析法和最大功率传输定理计算系统的输出功率和效率,得到使系统的传输功率达到最大值的补偿电容的参数曲线。选择曲线上的不同点进行计算和仿真,比较系统的传输功率、效率和输出电压电流波形。给出了具有S-S补偿结构的松耦合变压器无限输电系统补偿电容参数选择的参考方法。
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引用次数: 0
Research on Simulation Evaluation Technology of Naval Gun Confrontation Training 海军火炮对抗训练仿真评估技术研究
Weiguang Zhao, Jianxing Han
In view of the deficiencies of the traditional military configuration evaluation mode with real troops, real weapons and live ammunition, and carry out research on the design of simulation evaluation technology for naval gun confrontation training of both red and blue sides. The functional structure and evaluation process of naval gun confrontation training simulation evaluation are designed, the key technologies such as the missing distance of naval gun and the evaluation of confrontation effect are emphatically studied, which can be used to operate the portable naval gun confrontation training simulation environment, and realize the iterative optimization of the confrontation combat training scheme and organize as needed.
针对传统实兵实弹实弹军事构型评估模式的不足,开展了海军红蓝双方舰炮对抗训练仿真评估技术设计研究。设计了舰炮对抗训练仿真评估的功能结构和评估流程,重点研究了舰炮失靶距离和对抗效果评估等关键技术,可用于操作便携式舰炮对抗训练仿真环境,实现对抗作战训练方案的迭代优化和按需组织。
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引用次数: 0
Locking and Twisting Effect Simulation in ADAMS of Space Robot to Target Satellite Based on Uniform Design 基于均匀设计的空间机器人对目标卫星锁扭效应ADAMS仿真
Linjiang Huang, Xiaohong Yu, Jiejuan Wang, Xinling Li, Yijia Qu
In this paper, based on the models of space robot and target satellite in ADMAS, the uniform design experimentation schemes of mechanical arm locking and twisting process to target, the simulation of locking and twisting effect, the unknown situations of space robot and target connection because of mechanical arm’s careless operations was showed intuitively.
本文以ADMAS中空间机器人与目标卫星的模型为基础,直观地展示了机械臂对目标锁扭过程的统一设计实验方案、锁扭效果仿真、机械臂操作不慎导致空间机器人与目标连接的未知情况。
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引用次数: 0
期刊
2023 IEEE 6th Information Technology,Networking,Electronic and Automation Control Conference (ITNEC)
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