Acoustic propagation in the Somali basin
Abstract
Acoustic propagation in the Somali Basin region of the
Indian Ocean was evaluated using the ICAPS program. Direct
path range predictions were made for a towed array (100 Kz)
at 100 m and a hull mounted sonar (2000 Hz) at 10 m sensing
a signal generated by a source at 100 m. Predictions were
based on climatological and recent observed data. These predictions
were compared in order to ascertain the accuracy of the ICAPS climatological prediction. In general, the ICAPS
performed marginally well during the summer monsoon season
with an average difference of 9 % in predicted ranges at
100 Hz" and 19% at 2000 Hz for a FOM of 100 or greater.
However, predictions based on the winter season climatology
were significantly in error with range predictions being
over and under predicted by a factor of two.