Sonar apparatus having improved gain control

Communications – electrical: acoustic wave systems and devices – Echo systems – Returned signal used for control

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Details

367108, 367900, G01S 1508, G01S 752

Patent

active

044208243

ABSTRACT:
A sonar device for use on a boat to indicate the depth of water on a digital display, including a transducer positioned in the water to transmit bursts of sound energy and for receiving echo energy reflected from the bottom, at least one variable gain receiver stage for amplifying the echo signals received by the transducer, a microprocessor for processing the amplified received signals to supply appropriate control signals to the digital display to indicate depth as a function of time required to receive echo signals, a means of controlling the gain of the receiver stage including a means with the microprocessor of supplying a plurality of paralleled output digital signals indicative of the required gain, means for converting the digital signal output to an analog gain control signal, and circuit means for applying the voltage gain control signal to the sonar receiver.

REFERENCES:
patent: 4151481 (1979-04-01), Funston et al.
patent: 4198702 (1980-04-01), Clifford
patent: 4210969 (1980-07-01), Massa
patent: 4274148 (1981-06-01), Van't Hollenaar

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