Journal ArticleDOI
An Iterative Interpolated DFT to Remove Spectral Leakage in Time-Domain Near-Field Scanning
TLDR
An improved method to detect the presence of such noncoherently sampled signals as well as an iterative algorithm to obtain accurate approximations of all the frequency components with their accompanying amplitudes and phase angles is proposed.Abstract:
Time-domain near-field scanning is gaining more and more interest within EMC engineering to analyze electromagnetic near-fields of, eg, quasi-stationar devices When using a digital oscilloscope to scan the near-fields of an electronic device, the oscilloscope measures time-domain signals that comprise in most cases a large number of frequency components For many of these components, noncoherent sampling occurs, resulting in spectral leakage when calculating the frequency spectrum of the time-domain signals with the discrete Fourier transform This paper proposes an improved method to detect the presence of such noncoherently sampled signals as well as an iterative algorithm to obtain accurate approximations of all the frequency components with their accompanying amplitudes and phase angles The algorithm excels over existing algorithms in obtaining these values especially in situations where several sinusoidal components are close to each other in the spectrum This is achieved, thanks to an iterative process of removing the influence of the multiple sinusoidal components on each other This paper contains the mathematical description of the algorithm and a numerical example evaluating the accuracy of the algorithm The algorithm has a higher accuracy than the existing approaches, eg, multipoint Interpolated Discrete Fourier Transform (IpDFTs), with only a slight increase of the computational costread more
Citations
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Journal ArticleDOI
A Novel Interpolated DFT Synchrophasor Estimation Algorithm With an Optimized Combined Cosine Self-Convolution Window
Tao Jin,Weifeng Zhang +1 more
TL;DR: Using the sidelobe characteristics of the window functions as the evaluation index, an optimized combined cosine window is obtained by the accelerated particle swarm optimization (APSO) algorithm and the window function’s self-convolution is used to further expand its excellent characteristics.
Journal ArticleDOI
A Novel Fault Diagnosis Method for High-Temperature Superconducting Field Coil of Superconducting Rotating Machine
TL;DR: In this paper, a new method is presented for sensitive quench detection in high-temperature superconductor (HTS) rotating machinery, which reduces the noise generated from the power supply and from the HTS rotating machinery.
Proceedings ArticleDOI
Modeling of stochastic electromagnetic fields
TL;DR: Measure and modeling techniques are discussed for the characterization of noisy electromagnetic fields originating from noisy or quasi-stochastic radiation sources on printed circuit boards or other electronic devices and systems.
Proceedings ArticleDOI
Comparative Evaluation of PMU Algorithms for Power Quality Monitoring in Distribution
TL;DR: The investigation of the PMU algorithm and comparison with the classical algorithm are made to detect the dips and swells in the voltage profile and will lighten the possibilities and the limitations of thePMU algorithm for swells and dip detection in the power supply.
Journal ArticleDOI
Performance Evaluation and Comparison of a Low-Cost, PLL-Based Acquisition System Under Off-Nominal Conditions
TL;DR: A low-cost acquisition system (AS) developed by the authors and a full comparison with off-the-shelf products during ideal or not power source is provided, highlighting the potentialities of the developed system for its implementation in both laboratory or medium-/low-voltage (MV/LV) networks.
References
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On the use of windows for harmonic analysis with the discrete Fourier transform
TL;DR: A comprehensive catalog of data windows along with their significant performance parameters from which the different windows can be compared is included, and an example demonstrates the use and value of windows to resolve closely spaced harmonic signals characterized by large differences in amplitude.
Journal ArticleDOI
An overview of near-field antenna measurements
TL;DR: In this paper, a brief history of near-field antenna measurements with and without probe correction is outlined, beginning with ideal probe scanning on arbitrary surfaces and ending with arbitrary probes scanning on planar, cylindrical, and spherical surfaces.
Journal ArticleDOI
Interpolation Algorithms for Discrete Fourier Transforms of Weighted Signals
TL;DR: In this paper, a new scheme is presented for the determination of the parameters that characterize a multifrequency signal, where the signal is weighted before the discrete Fourier transform (DFT) is calculated from which the frequencies and complex amplitudes of the various components of the signal are obtained by interpolation.
Journal ArticleDOI
High-Accuracy Analog Measurements via Interpolated FFT
TL;DR: In this article, interpolated fast Fourier transform (FFT) algorithms are used for multi-parameter measurements upon periodic signals, such as fundamental frequency, phase, and amplitude, with enhanced accuracy compared to existing algorithms.
Journal ArticleDOI
Prediction of Radiated Emissions Using Near-Field Measurements
TL;DR: In this paper, a procedure is developed to predict electromagnetic interference from electronic products using near-field scan data, which is used to define equivalent electric and magnetic current sources characterizing the electromagnetic emissions from an electronic circuit.