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Automatic Detection and Classification Equipment for High Resolution Sonar.
Patent, Filed 9 Jul 69, patented 6 Nov 90,
DEPARTMENT OF THE NAVY WASHINGTON DC
Pagination or Media Count:
The echo ranging system of the invention comprises circuit means to differentiate between shadows cast by objects and the period of time prior to the receipt of the first bottom return, as well as the lack of bottom reverberation for other reasons. Additional circuit means determine if the length of the shadow signals in comparison to their range exceeds a predetermined value. Circuit means are also included to produce a first electrical signal when such shadow signals are received. Further circuitry analyzes the shadow signals for which the first electrical signals were provided and produces a second electrical signal when said object shadow signals exceed in number or length a predetermined value. Additional circuit means are provided to convert said first and second electrical signals suitable audible signals which may be readily distinguished, one from the other.
APPROVED FOR PUBLIC RELEASE