Uso do efeito Lloyd Mirror na detecção do ruído irradiado em águas rasas

Abstract

In this dissertation, procedures are presented to reduce the interference over irradiated noise signals easured in the Acoustic Range of the Brazilian Navy, this signal already treated is recorded in matrix format and later used to calculate the value of the correlation with the matrix obtained in simulations.The latter use the Lloyd Mirror effect which produces constructive and destructive interference in the received signal related to the radiated noise of the ships. In order to estimate the levels of these signals at a distance of one meter from the ship, a standardized method for specifying these levels, it is necessary to take into account the mentioned interference. From the results it is possible to verify the effectiveness of these procedures. These additionally allow you to find parameter values such as: horizontal distance and depth of the source. With few modifications to the models, it is believed that in future works it is possible to calculate other values such as ship speed, etc.