  The study and application of signal detection techniques based on
cross-correlation method for acoustic transient signals in noisy and
reverberant environments are presented. These techniques are shown to provide
high signal to noise ratio, good signal discernment from very close echoes and
accurate detection of signal arrival time. The proposed methodology has been
tested on real data collected in environments and conditions where its benefits
can be shown. This work focuses on the acoustic detection applied to tasks of
positioning in underwater structures and calibration such those as ANTARES and
KM3NeT deep-sea neutrino telescopes, as well as, in particle detection through
acoustic events for the COUPP/PICO detectors. Moreover, a method for obtaining
the real amplitude of the signal in time (voltage) by using cross correlation
has been developed and tested and is described in this work.
