Measurements of bottom‐limited ocean impulse responses and comparisons with the time‐domain parabolic equation
| Autor: | J. H. Leclere, R. L. Field |
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| Rok vydání: | 1993 |
| Předmět: | |
| Zdroj: | The Journal of the Acoustical Society of America. 93:2599-2616 |
| ISSN: | 0001-4966 |
| DOI: | 10.1121/1.405834 |
| Popis: | Ocean impulse response functions computed with the time‐domain parabolic equation model are shown to be consistent with response functions measured in a bottom‐limited ocean located off the east coast of the United States. The geoacoustics used in the model are developed from Deep Sea Drilling Project sites near the experimental area. Measured impulse responses are obtained by correlating the measured source signature of a 25‐ to 150‐Hz linear, frequency‐modulated signal with the signals received on a 15‐element vertical line array. Correlation coefficients computed as a function of depth are used as a measure of comparison between measured and modeled responses. The capability of the time‐domain parabolic equation to model wide‐angle (68°–75°) multipaths and sub‐bottom layers with high impedance contrasts is shown. Correlation loss between response functions measured from different transmissions at the same range is shown to be attributable to the degree to which spatial invariance of the ocean can be assumed. |
| Databáze: | OpenAIRE |
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