Influences and Modification of Random Errors in Amplitude and Phase on The Fidelity of Vessel Radiated Noise Power Spectrum With Array

Abstract

In the acquisition of vessel radiated noise characteristics based on acoustic array, element failure or acoustic propagation or other reasons will cause the random errors in amplitude and phase of each channel signal, and lead to vessel radiated noise power spectrum acquired by beam-forming. In order to modify this error, based on mathematical model, the difference between mean power spectrum of all channel signals and power spectrum of beam-forming with random errors in amplitude and phase was analyzed, and a correction method for power spectrum amplitude was established. The simulation results show that the effect of errors in phase is much greater than the errors in amplitude, and the correction method in this paper can effectively reduce the beam-forming power spectrum amplitude error. And the analysis results of measured data show that, taking the mean power spectrum of all channel signals as the reference, the error before correction was 3dB~5dB, and the corrected error was 1dB~3dB, meeting the error range requirements.