Circuit for automatic seabed discrimination

Details Circuit for automatic seabed discrimination Circuit for automatic seabed discrimination

1984-01-19

1987-03-03

Farley, Richard A.

Communications, electrical: acoustic wave systems and devices

Echo systems

73573, 73596, 367112, G01S 1502, G01S 766

Patent

active

046480811

ABSTRACT:
A circuit automatically determines the nature of the seabed over which a vessel is passing, indicating via an audible or other warning signal when a fishing vessel is above a type of seabed which might damage the fishing net. The circuit is responsive to an echosounder signal and raises an alarm when a amplitude of the second bottom echo component in the echosounder signal exceeds a selected threshold level. Preferably the analog echosounder signal is subject to threshold discrimination to provide a pulse-form signal which is then processed by a digital logic circuit to isolate the second bottom echo component.

REFERENCES:
patent: 3478308 (1969-11-01), Stanley et al.
patent: 3489996 (1970-01-01), Moon et al.
patent: 3629800 (1971-12-01), Schneider
patent: 4353121 (1982-10-01), Ray et al.
patent: 4410966 (1983-10-01), Meyer et al.

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