Abstract:
Comparing the perturbation scale of underwater acoustic field due to environment uncertainty is of great theoretical significance and application value,which is important to improve the accuracy of underwater acoustic field prediction.In this paper,the likelihood function is constructed between the primary and perturbation sound field, which is used as the acoustic perturbation indicator.And,the numerical model of Kraken normal mode and the MCMC (Markov Chain Monte Carlo) method are used to analyze the acoustic perturbation and the correlation between different parameters,which result from the random variation of environment parameters,based on single variable principle and Workshop'97 shallow-water benchmark environment model.The results show that the parameters
C1 and
D1 are the most sensitive to acoustic perturbation,while the
αs,
ρs,
C2,
D2,
C3 are less,and the
αb and
ρb are almost none of influence;The sensitivities of
αs,
ρs,
C1,
D1 increase with distance increasing,while the sensitivities of
C2,
D2,
C3 attenuate.It is found that reasonably strong positive correlations exist between
D2 and
C2,
D2 and
C3,
C1 and
C3,
C2 and
C3, and obvious negative correlations exist between
D2 and
C1,
C1 and
C2.
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