Communications – electrical: acoustic wave systems and devices – Echo systems – Distance or direction finding
Patent
1991-02-01
1992-06-16
Pihulic, Daniel T.
Communications, electrical: acoustic wave systems and devices
Echo systems
Distance or direction finding
367 89, G01S 1500
Patent
active
051229900
ABSTRACT:
A system and method for bottom tracking in a sonar system. The present invention provides for convolving the received signal with the second derivative, or an approximation thereof, of the matched transmitted pulse. In another aspect of the invention, the received signal is convolved with the matching transmitter pulse and the result is evaluated by summing the differences between a central peak and its neighboring left and right values. The filtering of the present invention removes the effect of water absorption on signal amplitude. The invention also includes compensating for spreading loss in the received signal.
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Deines Kent L.
Maier Steve J.
Pihulic Daniel T.
Rowe-Deines Instruments Incorporated
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