| Popis: |
We have developed a 12‐kHz, 24‐element rigid source receiver array [J. Acoust. Soc. Am. 117, 2462 (2005)]. During sea trials in spring 2005, the array has been deployed in the Brest Bay, in a 12‐m‐deep channel. Backscattered data from a variety of submerged objects have been recorded for distances up to 1 km. After the description of the experimental setup and the acoustic propagation conditions, results from detection experiments using the DORT method will be presented. In particular, we will focus on separation of target echo from bottom reverberation as well as separation of two targets. Resolution and sensitivity aspects of the method will be discussed and compared with results obtained with conventional beamforming. Furthermore, selective focusing by transmission of the eigenvectors of the time reversal operator will be shown. [Work supported by the French DGA/SPN under Contract No. 02 77 154 00 470 75 53.] |
