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2017 13th IEEE International Conference on Electronic Measurement & Instruments (ICEMI)最新文献

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Errors analysis of new method to generate UTC parameters for BDS 北斗系统UTC参数生成新方法的误差分析
L. Dandan, Xu Longxia, Zhu Feng, Li Bo, L. Xiaohui
All satellite navigation systems generate their UTC parameters by direct time comparison between their system times and UTC(K) via TWSTFT or common-view. The timing accuracy of these methods is several nanoseconds. But they have the characteristics of complicated and expensive devices and limited users. Considering the unique constellation of BDS, a new method for generating UTC parameters is proposed. Its principle is explained and the main errors are analyzed. Values of these errors are calculated by carrying out correlative experiments. The results show users' residual satellite ephemeris errors are within 1 ns and residual ionospheric delay correction errors are within 2.5 ns and tropospheric delay correction errors are less than 0.17 ns and prediction errors of UTC parameters are within 4 ns except individual satellites and receivers relative calibration precision is 1.5 ns after calibrated by reference station's receivers.
所有卫星导航系统都是通过TWSTFT或common view将其系统时间与UTC(K)直接进行时间比较来生成UTC参数的。这些方法的计时精度为几纳秒。但它们具有设备复杂、价格昂贵、使用范围有限的特点。针对北斗系统星座的特殊性,提出了一种生成UTC参数的新方法。阐述了其原理,分析了主要误差。通过相关实验计算了这些误差的取值。结果表明:除个别卫星和接收机经参考站接收机标定后的相对标定精度为1.5 ns外,用户星历剩余误差在1 ns以内,电离层剩余延迟校正误差在2.5 ns以内,对流层剩余延迟校正误差小于0.17 ns, UTC参数预测误差在4 ns以内。
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引用次数: 0
Frequency characteristic of ultrasonic based on soft tissue attenuation model 基于软组织衰减模型的超声频率特性研究
Kang Wei-xin, Gong Xue, Wang Hongru, Pan Dawei
Aiming at the deficiency of the theoretical analysis of ultrasonic attenuation in soft tissue, based on the propagation mechanism of ultrasonic transmission method in soft tissue, summarized the theoretical calculation formula to analyze the ultrasonic attenuation in soft tissue, after calculation and comparison, the theoretical calculation is close to the experimental value, it can be applied to the analysis of soft tissue conditions. Ultrasonic attenuation characteristic in soft tissue not only related to the soft tissue characteristic parameters and the ultrasonic frequency, but also transmission distance is a great relationship. In this paper, we establish a soft tissue model to simulate the ultrasonic attenuation characteristic in time and frequency domain, and proposed the study on frequency characteristics of the ultrasonic wave based on the continuous wave of Linear frequency modulation(LFM) signal, that can be better used to analyze the frequency characteristics of ultrasonic attenuation in soft tissue.
针对超声在软组织中衰减理论分析的不足,基于超声在软组织中传播方式的传播机理,总结了超声在软组织中衰减的理论计算公式,经过计算和比较,理论计算接近实验值,可应用于软组织状况的分析。超声在软组织中的衰减特性不仅与软组织特性参数和超声频率有关,而且与传输距离也有很大关系。本文建立了软组织模型,在时域和频域上模拟超声衰减特性,提出了基于线性调频(LFM)信号连续波的超声频率特性研究,可以更好地用于分析超声在软组织中的衰减频率特性。
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引用次数: 1
The research and rectification on the test of immunity to electromagnetic RF fields for electrical energy meter 电能表射频电磁场抗扰度测试的研究与改进
Wang Pingxin, L. Congcong, Zhang Zhi, Dai Yanjie, Du Yan, Dong Xianguang, Chen Zhiru, Yang Jie, Li Lin
With the wide application of electronic equipment and the popularization of electrical energy meter of state Grid, the electrical energy meter of site operation is often subject to various types of interference, the EMC of electrical energy meter become increasingly prominent. This methods and the problems of radio frequency electromagnetic field radiated immunity test are analyzed and discussed, the anti-jamming capability of electrical energy meter is improved by using the EMC technology. After rectification, the electrical energy meter passed the radio frequency electromagnetic field radiated immunity test, The measurement performance of the electrical energy meter is guaranteed, the legal rights and interests of both side of power supply and power demand are not damaged.
随着电子设备的广泛应用和国家电网电能表的普及,现场运行的电能表往往会受到各种干扰,电能表的EMC问题日益突出。分析和讨论了射频电磁场辐射抗扰度测试的方法和存在的问题,利用电磁兼容技术提高了电能表的抗干扰能力。经整改后,电能表通过了射频电磁场辐射抗扰度测试,电能表的测量性能得到保证,供电、用电双方的合法权益不受损害。
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引用次数: 1
Scattering from the stratified uniaxial anisotropic media in directional source excitation in the spectral domain 层状单轴各向异性介质在定向源激励下的谱域散射
C. Peng, Li Lianlian, Deng Wei
In order to evaluat the scattering from stratified uniaxial anisotropic media (UEAM) in directional source excitation in the spectral domain. In this way, the reflection field of an infinite ideal conductor plate coated with a uniform anisotropic dielectric layer is estimated, which involves every wave mode of the multiple reflections theoretically. Initially, the spectral formulas of radiation of point source in free space and in the electric anisotropic slab under point source excitation are proposed. The boundary conditions of the upper and lower surfaces of the anisotropic plate are then used to solve the complex amplitude of the scattering field in the spectral domain. Using the saddle point method (SPT) to approximate the scattering field in the airspace, the scattering field is obtained from the scattering field. The accuracy of the approximate solution is verified by comparison with the results of the method of moments (MOM).
为了评价层状单轴各向异性介质(UEAM)在定向源激励下的散射特性。通过这种方法,从理论上估计了均匀各向异性介质层覆盖的无限理想导体板的反射场,其中涉及到多次反射的每一波模式。首先,给出了点源在自由空间和电各向异性平板上的辐射谱公式。然后利用各向异性板上下表面的边界条件,在谱域中求解散射场的复振幅。利用鞍点法(SPT)逼近空域中的散射场,从散射场中得到散射场。通过与矩量法(MOM)结果的比较,验证了近似解的准确性。
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引用次数: 1
Research status of digital electrical energy metering technology 数字电能计量技术的研究现状
Pan Feng, Lin Guoying, Wan Lingyun, Song Qiang
With the large-scale construction of digital substation, digital energy metering technology based on IEC 61850 standard is widely used. In this paper the research and application status of digital energy metering technology is summarized. The structure of digital substation and the composition of digital measurement system are introduced. The research and development status of key equipment such as electronic transformers, merging units and digital energy meters in digital measurement system are expounded, and the characteristics of digital metering system are summarized. Finally, the key technology problems in digital measurement system are discussed in terms of the reliability of electronic transformer, measurement algorithm of the digital power meter and the calibration method of electronic transformer and digital energy meter.
随着数字化变电站的大规模建设,基于IEC 61850标准的数字化电能计量技术得到了广泛的应用。本文综述了数字电能计量技术的研究和应用现状。介绍了数字化变电站的结构和数字化测量系统的组成。阐述了数字计量系统中电子变压器、并合单元、数字电能表等关键设备的研发现状,总结了数字计量系统的特点。最后,从电子变压器的可靠性、数字电能表的测量算法、电子变压器和数字电能表的标定方法等方面讨论了数字测量系统中的关键技术问题。
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引用次数: 2
Atomic clock frequency difference prediction algorithm based on genetic wavelet neural network 基于遗传小波神经网络的原子钟频差预测算法
Z. Jiangmiao, Chen Ye, Gao Yuan, Wang Yuzhuo, Yan Di
Atomic clock frequency difference prediction is the key step in atomic clock time scale calculation and atomic clock control. Precise prediction algorithm can accurately predict the future operation state of atomic clock which can be used to improve the accuracy of atomic time. In order to further improve the prediction accuracy of atomic clock frequency difference, a genetic wavelet neural network (GAWNN) atomic clock frequency difference prediction algorithm is proposed in this paper, which is based on wavelet neural network (WNN) atomic clock frequency difference prediction algorithm. The genetic algorithm is used to optimize the wavelet neural network so as to select the appropriate number of hidden layers and the number of training points to construct the atomic clock frequency difference prediction model. In this paper, the algorithm is validated by the hydrogen clock and cesium clock actual frequency difference data of the National Institute of Metrology, and the results show that the algorithm improves the prediction accuracy of hydrogen clock and cesium clock frequency difference data.
原子钟频差预测是原子钟时标计算和原子钟控制的关键步骤。精确预测算法可以准确地预测原子钟未来的运行状态,从而提高原子时的精度。为了进一步提高原子钟频差的预测精度,本文在小波神经网络(WNN)原子钟频差预测算法的基础上,提出了一种遗传小波神经网络(GAWNN)原子钟频差预测算法。利用遗传算法对小波神经网络进行优化,选择合适的隐藏层数和训练点数来构建原子钟频差预测模型。本文利用国家计量所的氢钟和铯钟实际频差数据对算法进行了验证,结果表明该算法提高了氢钟和铯钟频差数据的预测精度。
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引用次数: 0
A state monitoring method of fire water supply system based on hydraulic pressure mean value 基于水压均值的消防给水系统状态监测方法
Zhu Leiji, Tong Huijiao, Lou Liangliang, Xiong Yong
Real-time control of urban fire water supply system status, to ensure the safety and reliability of fire fighting and rescue is of great significance. This paper proposes a method of monitoring the status of urban firefighting water supply system based on water pressure mean. It theoretically analyzed the principle and realization method of sliding filter for hydraulic pressure sensor, and emphatically studied the time domain law of hydraulic pressure signal. The differences in the water pressure mean values in different states of water system were studied in detail. Finally, the effectiveness of the algorithm was verified by the actual leakage test. The results show that the method can obtain the status of the fire water supply system accurately, and monitor the abnormal state of the system in real time, which provide a reliable information guarantee for the fire rescue operation command.
实时控制城市消防给水系统状态,对保证消防救援的安全可靠具有重要意义。提出了一种基于水压均值的城市消防供水系统状态监测方法。从理论上分析了液压传感器滑动滤波的原理和实现方法,重点研究了液压信号的时域规律。详细研究了水系不同状态下水压均值的差异。最后,通过实际泄漏试验验证了算法的有效性。结果表明,该方法能准确获取消防给水系统状态,实时监测系统异常状态,为消防救援行动指挥提供可靠的信息保障。
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引用次数: 8
Design of acquisition system with real time sampling rate of 5Gsps 实时采样率为5Gsps的采集系统设计
Da Zhijian, Xiao Shuangman, L. Jingjing, Yang Xi, Wang Qi, Zhao Yijiu
With development of digital signal processing, the bandwidth of underlying signal becomes broader. It requires that the acquisition system must be with high sampling rate. In this paper, we propose a design of high-speed acquisition system, which is with real time sampling rate of 5Gsps and mass storage based on PCI extension for instrument (PXI) bus. The system sampler uses multi-core analog-to-digital converter (ADC) parallel sampling and combines accurate sampling clock to have enough effective bits under the premise of ensuring high real-time sampling rate. Using Field Programmable Gate Array (FPGA) to collect high-speed samples from ADC. In FPGA, serial to parallel module decreases the data rate. In order to improve the capability of capturing transient signals, the trigger detection unit is designed to control the storage operation. In addition, the design of mass data storage enhances the ability of data acquisition system to capture high speed signals. Consequently, improve the detail analysis ability of the system. The designed system has been tested with satisfactory results.
随着数字信号处理技术的发展,底层信号的带宽越来越宽。这就要求采集系统必须具有较高的采样率。本文提出了一种基于PCI扩展仪表总线(PXI)的实时采样率为5Gsps、大容量存储的高速采集系统设计方案。系统采样器采用多核模数转换器(ADC)并行采样,结合精确的采样时钟,在保证高实时采样率的前提下拥有足够的有效位。利用现场可编程门阵列(FPGA)从ADC采集高速采样。在FPGA中,串行转并行模块降低了数据速率。为了提高暂态信号的捕获能力,设计了触发检测单元来控制存储操作。此外,海量数据存储的设计增强了数据采集系统对高速信号的捕获能力。从而提高了系统的细节分析能力。所设计的系统已经过测试,取得了满意的结果。
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引用次数: 2
Test wrapper algorithm for scan chain balance based on entropy increase hybrid differential evolution 基于熵增混合差分进化的扫描链平衡测试包装算法
Deng Li-bao, Zhang Baoquan, Wang Sha, Qiao Liyan
A well cores reused-based wrapper design is an important approach to minimize SOC test application time and test costs. The combinatorial optimization problem of core wrapper design has been proven to be a NP-hard problem. In this paper, a wrapper scan chain balance algorithm with entropy increase hybrid discrete differential evolution (EIHDE) is proposed to solve the core wrapper problem, which is inspired by thermodynamic system principle of entropy increase and outstanding global searching ability of Differential Evolution (DE). The proposed approach develops a cooperative mutation strategy based on entropy increase for the problem to preserving its interesting search mechanism for discrete domains. In the proposed model, two cooperative encode modes of individuals are introduced for standard differential mutation and the cooperative entropy increase mutation: integer encode mode and binary encode mode. EIHDE controls the search space by differential mutation, and search for superior individual in local space by entropy increase mutation. The combination of two kinds of mutation operations promotes the optimization ability considerably and achieves a better tradeoff between exploitation and exploration. The experimental results of the ITC'02 SOC test benchmarks show that EIHDE can achieve more balanced results compared with other algorithms.
基于井芯重用的封装器设计是最小化SOC测试应用时间和测试成本的重要方法。岩心包装设计的组合优化问题已被证明是一个np困难问题。基于熵增的热力学系统原理和差分进化(DE)出色的全局搜索能力,提出了一种熵增混合离散微分进化(EIHDE)的包装扫描链平衡算法来解决核心包装问题。该方法提出了一种基于熵增的协同突变策略,以保持其在离散域的有趣搜索机制。在该模型中,针对标准微分突变和熵增突变,引入了个体间的两种合作编码模式:整数编码模式和二进制编码模式。该算法通过微分突变控制搜索空间,通过熵增突变在局部空间中搜索优个体。两种变异操作的组合大大提高了优化能力,并在开采和勘探之间实现了更好的权衡。ITC'02 SOC测试基准的实验结果表明,与其他算法相比,EIHDE可以获得更均衡的结果。
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引用次数: 1
Active calibration technology for polarimetrie radar measurement 偏振雷达测量的主动标定技术
Shi Longfei, Liu Qiaoling, Liu Jian, Pang Chen
Polarimetrie measurement is a prerequisite for applications such as radar target recognition and anti-interference based on polarimetry information. The precision of polarimetric measurement depends on the accuracy of the calibration of polarimetric radar systems. In this paper, a new polarimetric calibration method by designing a high-Precision polarimetric active radar calibrator(PARC) is proposed, which can accurately calibrate the radar transmitting and receiving channels, respectively. System composition and key technologies of the PARC are explained. And then the whole calibration method is provided.
偏振测量是基于偏振信息进行雷达目标识别和抗干扰等应用的前提。极化测量的精度取决于极化雷达系统标定的精度。本文通过设计高精度极化有源雷达校准器(PARC),提出了一种新的极化标定方法,可以分别对雷达发射信道和接收信道进行精确标定。介绍了PARC的系统组成和关键技术。然后给出了整个标定方法。
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引用次数: 0
期刊
2017 13th IEEE International Conference on Electronic Measurement & Instruments (ICEMI)
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