JASA Express Letters
Acoustic signal processing, Acoustic wave interference, Acoustic wave propagation, Acoustic wave transmission
Deep vertical line arrays can exploit the reliable acoustic path (RAP), which provides low transmission loss (TL) for targets at moderate ranges, and increased TL for distant interferers. However, nearby surface interference also has favorable RAP propagation and cannot be separated from a submerged target without horizontal aperture. In this work, a physics-based Fourier transform variant is introduced, which achieves depth-based signal separation by exploiting the spatial structure resulting from the coherent addition of the direct and surface-reflected propagation paths present for submerged sources. Simulation results demonstrate depth-based signal separation without requiring knowledge of the ocean environment.
McCargar, Reid, and Lisa M. Zurk. "Depth-based signal separation with vertical line arrays in the deep ocean." The Journal of the Acoustical Society of America 133, no. 4 (2013): EL320-EL325.