Methods of the Signal Processing for Sound Field Visualization

The paper deals with the features of the processing of acoustic signals generated by an underwater low-frequency radiator in shallow sea. Data from four channels of a combined hydroacoustic receiver is processed to identify a signal against noise and build 3D sonograms of the sound field. Linear and nonlinear processing algorithms were applied to separate the useful signal. Comparison of the sonograms shows the advantage of the nonlinear algorithm which completely eliminates the fluctuation component of the noise interference and provides a better visual detection of the signal component.