In this paper we analysis the performance of rifealgorithm and point out that the performance is poor when the true frequency is much close to quantized frequency of FFT. Aiming at this problem, an improvedrife algo...
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ISBN:
(纸本)9783319422947;9783319422930
In this paper we analysis the performance of rifealgorithm and point out that the performance is poor when the true frequency is much close to quantized frequency of FFT. Aiming at this problem, an improved rife algorithm is presented. This algorithm can make the signal frequency always located in the center between the two neighboring discrete frequencies by using zoom FFT technique. Then, in order to eliminate the impact of noise for the rifealgorithm, this paper propose to correct the improved rife algorithm by using the window function for the signal. Simulation result showed that the improvedalgorithm had high estimation accuracy, strong anti-noise performance and good stability.
In order to improve the frequency measurement accuracy and speed of frequency measurement receiver, an improvedrife frequency measurement algorithm is proposed. The implementation steps of the algorithm are described...
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ISBN:
(纸本)9789811903908;9789811903892
In order to improve the frequency measurement accuracy and speed of frequency measurement receiver, an improvedrife frequency measurement algorithm is proposed. The implementation steps of the algorithm are described in detail based on the analysis of traditional rife frequency measurement algorithm, The simulation results showthat the frequencymeasurement error of the algorithm is less than that of rifealgorithm under the same signal-to-noise ratio. In order to be easy to implement in FPGA and improve the running speed of the algorithm, the division operation in the original algorithm is optimized, the division is realized by subtraction, and the logarithmic operation is realized by look-up table, so that the frequency measurement speed is as high as 240 MHz.
As a vital piece of equipment, electronic voltage transformer is widely used in the power system measurements. The current calibration techniques of this asset class exhibit several issues including complex real time ...
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As a vital piece of equipment, electronic voltage transformer is widely used in the power system measurements. The current calibration techniques of this asset class exhibit several issues including complex real time implementation. In contrary with existing calibration techniques, this paper proposes a new correction system for electronic voltage transformers, which can be conducted online without causing any interruption to the electricity grid. The new proposed correction system utilizes an SF6 cylinder capacitor and employs an advanced signal processing technique based on the improvedrife frequency shift algorithm. The improvedrife frequency shift algorithm is a combination of the Hanning self-convolution window and the conventional rifealgorithm, which features simple calculation and high accuracy. Results show that the accuracy of the proposed algorithm is higher than the conventional commonly used interpolation algorithms. Compared with the existing traditional calibration techniques, the proposed system features easy online implementation, simple calculation and high accuracy. The robustness of the proposed system is validated through simulation analysis and practical field measurements.
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