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Wyszukujesz frazę "amplitude estimation" wg kryterium: Temat

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    Wyświetlanie 1-5 z 5
    Tytuł:
    On the Validity of the Noise Model of Quantization for the Frequency-Domain Amplitude Estimation of Low-Level Sine Waves
    Autorzy:
    Bellan, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/221016.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    quantization
    amplitude estimation
    sine wave
    discrete Fourier transform
    additive noise
    Opis:
    This paper deals with the amplitude estimation in the frequency domain of low-level sine waves, i.e. sine waves spanning a small number of quantization steps of an analog-to-digital converter. This is a quite common condition for high-speed low-resolution converters. A digitized sine wave is transformed into the frequency domain through the discrete Fourier transform. The error in the amplitude estimate is treated as a random variable since the offset and the phase of the sine wave are usually unknown. Therefore, the estimate is characterized by its standard deviation. The proposed model evaluates properly such a standard deviation by treating the quantization with a Fourier series approach. On the other hand, it is shown that the conventional noise model of quantization would lead to a large underestimation of the error standard deviation. The effects of measurement parameters, such as the number of samples and a kind of the time window, are also investigated. Finally, a threshold for the additive noise is provided as the boundary for validity of the two quantization models.
    Źródło:
    Metrology and Measurement Systems; 2015, 22, 1; 89-100
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Interpolated-DFT-Based Fast and Accurate Amplitude and Phase Estimation for the Control of Power
    Autorzy:
    Borkowski, J.
    Kania, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/221570.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    control of power
    grid signal
    amplitude and phase estimation
    renewable energy
    interpolated DFT
    maximum decay side-lobes windows
    Opis:
    Quality of energy produced in renewable energy systems has to be at the high level specified by respective standards and directives. One of the most important factors affecting quality is the estimation accuracy of grid signal parameters. This paper presents a method of a very fast and accurate amplitude and phase grid signal estimation using the Fast Fourier Transform procedure and maximum decay side-lobes windows. The most important features of the method are elimination of the impact associated with the conjugate’s component on the results and its straightforward implementation. Moreover, the measurement time is very short ‒ even far less than one period of the grid signal. The influence of harmonics on the results is reduced by using a bandpass pre-filter. Even using a 40 dB FIR pre-filter for the grid signal with THD ≈ 38%, SNR ≈ 53 dB and a 20‒30% slow decay exponential drift the maximum estimation errors in a real-time DSP system for 512 samples are approximately 1% for the amplitude and approximately 8.5・10‒2 rad for the phase, respectively. The errors are smaller by several orders of magnitude with using more accurate pre-filters.
    Źródło:
    Metrology and Measurement Systems; 2016, 23, 1; 13-26
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fast estimation of the non-stationary amplitude of a harmonically distorted signal using a Kalman filter
    Autorzy:
    Kovač, U.
    Košir, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/220868.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    amplitude estimation
    harmonic signal
    harmonic distortion
    Kalman filter
    Opis:
    In this paper we introduce a self-tuning Kalman filter for fast time-domain amplitude estimation of noisy harmonic signals with non-stationary amplitude and harmonic distortion, which is the problem of a contactvoltage measurement to which we apply the proposed method. The research method is based on the self-tuning of the Kalman filter's dropping-off behavior. The optimal performance (in terms of accuracy and fast response) is achieved by detecting the jump of the amplitude based on statistical tests of the innovation vector of the Kalman filter and reacting to this jump by adjusting the values of the covariance matrix of the state vector. The method's optimal configuration of the parameters was chosen using a statistical power analysis. Experimental results show that the proposed method outperforms competing methods in terms of speed and accuracy of the jump detection and amplitude estimation.
    Źródło:
    Metrology and Measurement Systems; 2013, 20, 1; 27-42
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Estimation of the amplitude square using the interpolated Discrete Fourier Transform
    Autorzy:
    Lušin, T.
    Agrež, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/220579.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    estimation
    amplitude square
    spectral data processing
    interpolated DFT
    Hann window
    Opis:
    To improve the estimation of active power, the possibility of estimating the amplitude square of a signal component using the interpolation of the squared amplitude discrete Fourier transform (DFT) coefficients is presented. As with an energy-based approach, the amplitude square can be estimated with the squared amplitude DFT coefficients around the component peak and a suitable interpolation algorithm. The use of the Hann window, for which the frequency spectrum is well known, and the three largest local amplitude DFT coefficients gives lower systematic errors in squared interpolated approach or in better interpolated squared approach than the energy-based approach, although the frequency has to be estimated in the first step. All investigated algorithms have almost the same noise propagation and the standard deviations are about two times larger than the Cramér-Rao lower bound.
    Źródło:
    Metrology and Measurement Systems; 2011, 18, 4; 583-596
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A highly accurate DFT-based parameter estimator for complex exponentials
    Autorzy:
    Tsui, J.
    Reisenfeld, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/309144.pdf
    Data publikacji:
    2006
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    frequency estimation
    phase estimation
    amplitude estimation
    DFT-based parameter estimation
    spectral estimation
    digital signal processing algorithm
    complex exponential parameter estimation
    Opis:
    A highly accurate DFT-based complex exponential parameter estimation algorithm is presented in this paper. It will be shown that for large number of samples and high signal to noise ratio (SNR), the phase estimation error variance performance is only 0.0475 dB above the Cramer-Rao lower bound (CRLB) for phase estimation with unknown frequency and phase. The amplitude estimation error variance performance was found to lay on the CRLB for amplitude estimation. Exact phase and amplitude estimation can be achieved in the noiseless case with this algorithm. The algorithm has low implementation computational complexity and is suitable for numerous real time digital signal processing applications.
    Źródło:
    Journal of Telecommunications and Information Technology; 2006, 1; 76-82
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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