Method for detecting an object underwater using sonar pulses

Abstract

A method for detecting an object (22) underwater using sonar pulses (24a, 24b, 24c) is disclosed, comprising the following steps: a) emitting a pulse sequence (24) of a plurality of sonar pulses (24a, 24b, 24c), wherein the sonar pulses of the plurality of sonar pulses (24a, 24b, 24c) are emitted at a predetermined interval T; b) receiving underwater sound (28) with reflections of the sonar pulses (24a, 24b, 24c); c) cross-correlating the received underwater sound (28) with a pulse of the pulse sequence (24) to obtain a correlation result (36); d) determining a spectrum (40) of the correlation result (36); e) evaluating the spectrum (40) at positions n / T, where n is a natural number, indicating the presence of the object. leading to an increase in level at points n / T.

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