Instantaneous frequency estimation method based on Roberts operator and Grubbs test

The present invention discloses an instantaneous frequency estimation method based on the Roberts operator and the Grubbs test. The method employs the short-time Fourier transform to convert original signals to a time-frequency spectrogram, employs the Roberts detection algorithm to obtain multi-strip ridge bands, employs the Grubbs test to eliminate the abnormal value of each ridge band, employs overlapping to construct a compound ridge band having a complete and clear edge, employs the Grubbs test to eliminate the abnormal value of the compound ridge band, calculates the mean curve of the compound ridge band, perform smooth processing of the mean curve, calculate a confidence interval, above the 95% confidence level, of the smooth mean curve and map the smooth mean curve and the confidence interval thereof to a target ridge to obtain the reference line and a local search interval of the target ridge, and employs a non-delayed cost function to extract the target ridge. The instantaneous frequency estimation