A method for detecting a non-cooperative signal of a cetacean-like whistle

Abstract

The application discloses a detection method of a non-cooperative signal of a kind of beluga whale whistle, comprising the following steps: (1) calculating the time-frequency matrix Y of the input signal by using the short-time Fourier transform; (2) calculating the entropy vector H according to the time-frequency matrix Y; (3) calculating the signal existence probability matrix P according to the entropy vector H; (4) estimating the background noise energy and the signal-to-noise ratio of each element in the time-frequency matrix according to the signal existence probability matrix P, and obtaining the signal-to-noise ratio matrix S; (5) grouping the matrix S according to the row to obtain the block signal-to-noise ratio matrix S1; (6) comparing each element of the S1 matrix with a preset threshold to obtain the binary block signal-to-noise ratio matrix S b ; (7) judging the length of the continuous appearance time of the 1 element of each row in the S b matrix, and judging whether the non-cooperative signal of the beluga whale whistle exists according to the time of the continuous appearance of the 1 element, if the non-cooperative signal of the beluga whale whistle exists, outputting the corresponding start row number and column number, end row number and column number of the non-cooperative signal of the beluga whale whistle in the S b matrix.

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