Shallow Water Reverberation from a Time Reversed Mirror

摘要

Modelling indicates that when the ocean boundaries are the dominant cause of revesberation, the signal-to-reverberation ratio at a target will be increased by generating a time-reversed signal from a vertical array. This occurs because the focusing; (1) increases the signal level at the target and (2) reduces the boundary illumination (hence reverberation). An experiment (as part of FAF99) was designed to study the latter (i.e., potential gain against reverberation) resulting from a 3.5 kHz time-reversed signal. Results show the extreme sensitivity of the gain to bathymetric variation and indicate the need for potentially high horizontal spatial resolution in the receive array.