Instantaneous frequency estimation method based on Sobel operator and PauTa examination
An instantaneous frequency and operator technology, applied in computing, computer components, character and pattern recognition, etc., can solve problems such as low accuracy and precision, one-step cost function delay, and lack of adaptability of the function, so as to eliminate errors , Eliminate the effect of time delay
Active Publication Date: 2017-11-21
WEIFANG UNIVERSITY
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The invention discloses an instantaneous frequency estimation method based on a Sobel operator and a PauTa examination. The method comprises steps of using the short-time Fourier transform to convert an original signal into a time frequency spectrogram; using the Sobel detection algorithm to acquire multiple ridge belts; using the PauTa examination to exclude an abnormal value of each ridge belt; constructing a synthesized ridge belt with a complete clear edge through superposition; using the PauTa examination to exclude an abnormal value of the synthesized ridge belt; calculating a mean curve of the synthesized ridge belt; carrying out smoothing processing on the mean curve; calculating the confidence interval of the smooth mean curve at the 95% of confidence level; mapping the smooth mean curve and the confidence interval thereof to a target ridge line to obtain a reference line and a local searching interval of the target ridge line; and using a non-delay cost function to extract the target ridge line. According to the invention, the method is suitable for estimation of instantaneous frequency of complex multi-component variable frequency signals; defects in estimation of the instantaneous frequency of mechanical vibration signals in the prior art are overcome; accuracy and precision of estimation results are high; and the method is easily used in engineering application.
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