A new efficient method of source localization in waveguides processing in mode space
E. C. Shang · The Journal of the Acoustical Society of America · 1988
Matched-field processing can either be performed in phone space (matching the total field received by each phone) or in mode space (matching the resolved modes). For a stratified waveguide, more efficiency can be obtained in mode space due to the fact that: (1) the source range information and depth information are separable in mode space and the number of replicas is tremendously reduced from (N*M) to (N + M), where N is the range gridding number and M is the depth gridding number, and (2) more confidence can be obtained by making a choice from the resolved modes. In this paper, the “modal feature matching” (MFM) technique has been proposed instead of the “modal beamforming” (MB) technique. One of the advantages of this method is that high performance can be achieved even if only a few modes are available, especially for depth estimation, when two modes are sufficient. Numerical examples are presented.