Description:
Recent work has shown that endfire beamforming of ocean noise can be used to produce images of the seabed layering [Siderius et al., J. Acoust. Soc. Am. 120, 1315–1323 (2006)]. This initial noise imaging technique used conventional beamforming and was later extended to adaptive beamforming that is theoretically optimal. However, there can be problems with adaptive methods, which include extreme sensitivity to random errors, the required averaging time, and computational complexity. Here, the concept of supergain is used to show that delay and sum beamforming can produce nearly the same results as the optimal adaptive methods without the drawbacks.
Subject:
Underwater acoustics
Noise
Acoustical engineering
Electrical and Computer Engineering
Raw Url:
http://pdxscholar.library.pdx.edu/do/oai/?metadataPrefix=&verb=GetRecord&identifier=oai:pdxscholar.library.pdx.edu:ece_fac-1153
Source:
Electrical and Computer Engineering Faculty Publications and Presentations
Repository Record Id:
oai:pdxscholar.library.pdx.edu:ece_fac-1153
Record Title:
Using Practical Supergain for Passive Imaging with Noise
https://pdxscholar.library.pdx.edu/ece_fac/157
info:doi/10.1121/1.3663282
https://pdxscholar.library.pdx.edu/context/ece_fac/article/1153/viewcontent/siderius_using_practical.pdf