| Autor: |
Nicholas, Michael, Perkins, John S., Orris, Gregory J., Fialkowski, Laurie T., Heard, Garry J. |
| Předmět: |
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| Zdroj: |
Journal of the Acoustical Society of America; Nov2004, Vol. 116 Issue 5, p2891-2901, 11p, 2 Charts, 11 Graphs |
| Abstrakt: |
Acoustic data from the natural broadband signature of a quiet surface ship, recorded on the vertical leg of an L-shaped array, is used to invert for the local geo-acoustic parameters and the resulting effective environment is used for subsequent tracking of the surface ship using a matched-field tracking technique applied to the full array. The matched-field analysis includes a comparison of the incoherent product of the processed data from the horizontal and vertical subapertures with coherent processing of the data from the full L-shaped array. Subaperture processing is of interest since there is a (loose) requirement that the number of data snapshots be greater than or equal to the number of array elements. This presents averaging difficulties for large arrays when the source being observed is moving. Analyzing each array leg separately allows the use of a smaller number of snapshots from which averaged quantities are constructed. Taken separately, the vertical leg of the array provides range-depth information, while the horizontal leg provides bearing information. The incoherent product of each leg is compared to processing the full array coherently illustrating that the incoherent product generally worked as well, or better than, processing the full array, producing compact maxima at the ship location, and producing fewer false source locations. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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