Target signal extraction method based on frequency domain-wave number domain deconvolution

The invention relates to the field of underwater acoustic signal processing and particularly relates to a target signal extraction method based on frequency domain-wave number domain deconvolution. The method comprises steps of receiving a time domain array signal collected by an underwater acoustic uniform linear array, and converting the array signal from an array element domain-time domain to a frequency domain-wave number domain; establishing a spatial modal sensing matrix; estimating a spatial modal spectrum contained in the frame of data by using a deconvolution algorithm in combination with the spatial modal sensing matrix on a frequency domain-wave number domain; and enabling the wave number to correspond to the azimuth at different frequency points, converting the spatial modal spectrum into an azimuth-frequency domain beam spectrum, and extracting a frequency domain signal of the target according to the azimuth of the target. According to the method, a problem of target signal aliasing of convention