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Butterworth filter

About: Butterworth filter is a research topic. Over the lifetime, 6187 publications have been published within this topic receiving 69070 citations.


Papers
More filters
Journal ArticleDOI
TL;DR: In this article, linear programming techniques were used to determine the optimal filter weights for minimizing the peak range sidelobes of a binary phase-coded waveform, and the resulting filter was compared with the filter obtained by use of the least square approximation to the ideal inverse filter.
Abstract: Linear programming techniques are utilized to determine the optimal filter weights for minimizing the peak range sidelobes of a binary phase-coded waveform. The resulting filter is compared with the filter obtained by use of the least square approximation to the ideal inverse filter. For a test case using the 13-element Barker code the linear programming filter is found to have peak sidelobes as much as 5 dB lower than the least squares filter of the same length.

108 citations

Journal ArticleDOI
TL;DR: In this article, a new transfer function approach in passive harmonic filter design for industrial and commercial power system applications is presented, along with six common filter configurations and a simple four-step filter design procedure for a variable speed motor drive pumping plant.
Abstract: This article details a new transfer function approach in passive harmonic filter design for industrial and commercial power system applications Filter placement along with six common filter configurations are presented Harmonic impedance, voltage division and current division transfer functions are derived and used in a practical filter design procedure that incorporates IEEE-519 distortion limits directly into the design and component specification process A simple four-step filter design procedure is outlined and used in a variable speed motor drive pumping plant application

107 citations

Journal ArticleDOI
TL;DR: In this article, the performance of a wavelet-based detrending method was evaluated and compared with a new waveletbased detending method using GPS data from high latitudes.
Abstract: Accuracy and validity of scintillation indices estimated using the power and phase of the GPS signal depend heavily on the detrending method used and the selection of the cutoff frequency of the associated filter. A Butterworth filter with a constant cutoff frequency of 0.1 Hz is commonly used in detrending GPS data. In this study, the performance of this commonly used filter is evaluated and compared with a new wavelet-based detrending method using GPS data from high latitudes. It was observed that in detrending high-latitude GPS data, a wavelet filter performed better than Butterworth filters as the correlation between amplitude- and phase-scintillation indices in S 4 and ? ? improved significantly from 0.53, when using a Butterworth filter, to 0.79, when using the wavelet filtering method. We also introduced an improved phase-scintillation index, ? CHAIN, which we think is comparatively a better parameter to represent phase scintillations at high latitudes as the correlation between S 4 and ? CHAIN was as high as 0.90. During the analysis, we also noted that the occurrence of the "phase scintillation without amplitude scintillation" phenomenon was significantly reduced when scintillation indices were derived using the wavelet-based detrending method. These results seem to indicate that wavelet-based detrending is better suited for GPS scintillation signals and also that ? CHAIN is a better parameter for representing GPS phase scintillations at high latitudes.

106 citations

Journal ArticleDOI
TL;DR: An algebraic approach is proposed for the fast and reliable, on line, identification of the amplitude, frequency and phase parameters in unknown noisy sinusoidal signals.

104 citations

Journal ArticleDOI
TL;DR: In this paper, an eight-pole planar high-temperature superconducting (HTS) bandpass filter with a quasi-elliptic function response is described.
Abstract: This paper presents recent developments of an eight-pole planar high-temperature superconducting (HTS) bandpass filter with a quasi-elliptic function response. A novel planar filter configuration that allows a pair of transmission zeros to be placed at the band edges is described. The miniature HTS filter has a fraction bandwidth less than 1% and is designed for mobile communication base-station applications to increase sensitivity and selectivity. Design considerations including filter characteristics, design approach, sensitivity analysis and unloaded quality factor of resonators are addressed. The filter was fabricated using double-sided YBCO thin film on an MgO substrate of size 0.3/spl times/22.5/spl times/39 mm. Very good experimental results were obtained with the filter cooled using liquid nitrogen. The minimum passband loss was measured to be approximately 1 dB. The passband width at points 1 dB down from the minimum loss point was 12.8 MHz for a center frequency of 1738.5 MHz. High selectivity was achieved with a 30-dB rejection bandwidth of 16 MHz.

104 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202322
202282
202140
202059
201941
201864