Broadband Geo-Acoustic Inversion from Sparse Data Using Genetic Algorithms: Results from the 1997 Geo-Acoustic Inversion Workshop
[Technical Report, Memorandum Report]
SACLANT UNDERSEA RESEARCH CENTRE LA SPEZIA (ITALY)
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Matched field acoustic inversion techniques were investigated using data from sparsely populated, vertical receiving arrays and a single receiver element. The purpose of considering sparse data sets is to investigate, by simulation, the feasibility of reducing the number and complexity of acoustic measurements needed for geo-acoustic inversion. The entire bandwidth of the1997 G-Acoustic Inversion Workshop data 25-500 Hz was used to compensates for the lack of spatial information when a limited number of receivers is considered. Forward model PROSIM and inversion code SAGA were applied to benchmark cases sd , wa, and n. The inversion results generally showed good agreement with the ground truth, for full arrays, sparse arrays and single receiver elements. With a simple two layer model, an effective sound speed profile in the bottom was determined, which produced a good fit between model and observed pressure fields for the multi-layer case n.
- Theoretical Mathematics