Matched-field inversion of sound speed profile in shallow water using a parallel genetic algorithm |
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Authors: | Yanxin Yu Zhenglin Li Li He |
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Institution: | (1) Norwegian Defense Research Establishment (FFI), P O Box 115, NO-3191 Horten, Norway |
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Abstract: | A sound speed profile plays an important role in shallow water sound propagation. Concurrent with in-situ measurements, many
inversion methods, such as matched-field inversion, have been put forward to invert the sound speed profile from acoustic
signals. However, the time cost of matched-field inversion may be very high in replica field calculations. We studied the
feasibility and robustness of an acoustic tomography scheme with matched-field processing in shallow water, and described
the sound speed profile by empirical orthogonal functions. We analyzed the acoustic signals from a vertical line array in
ASIAEX2001 in the East China Sea to invert sound speed profiles with estimated empirical orthogonal functions and a parallel
genetic algorithm to speed up the inversion. The results show that the inverted sound speed profiles are in good agreement
with conductivity-temperature-depth measurements. Moreover, a posteriori probability analysis is carried out to verify the inversion results. |
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