Communications – electrical: acoustic wave systems and devices – Beam stabilization or compensation
Patent
1990-12-21
1992-02-18
Eldred, J. W.
Communications, electrical: acoustic wave systems and devices
Beam stabilization or compensation
367 13, 367129, 367135, 310337, 73 1DV, H04B 1700
Patent
active
050899880
ABSTRACT:
A method and apparatus for compensating sensitivity fluctuations in signals received from respective groups of hydrophones for the purpose of subsequent signal processing, the groups being arranged in a predetermined sequence (0, 1, 2, . . . i) to form a transducer arrangement, wherein the received signals are influenced by the sensitivity of the hydrophones and/or the gain of preamplifiers connected to the outputs of the hydrophones. The energy value (W.sub.i) for the received signals of each group of hydrophones is determined and a median energy curve (W.sub.m (.theta.)) is derived from the energy values (W.sub.i) as a function of the sequence of the groups of hydrophones. A correction value is formed for the signals received from each group of hydrophones from a comparison of the respective energy value (W.sub.i) with the energy curve (W.sub.m (.theta.)) and the received signals are corrected with the correction value.
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Eldred J. W.
Krupp Atlas Elektronik GmbH
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