Alexander Skoures

US Patent:

39672093, Jun 29, 1976

Filed:

Apr 27, 1973

Appl. No.:

5/355996

Inventors:

Alexander E. Skoures - Philadelphia PA
Joseph N. Farace - Maple Shade NJ

Assignee:

The United States of America as represented by the Secretary of the Navy - Washington DC

International Classification:

H03F 136
H03K 520

US Classification:

330 86

Abstract:

A bistatic velocity detector system for underwater detection of objects of redetermined magnitude wherein the water may be capable of continual variations in velocity. The system includes a compensator that has an automatic gain controlled amplifier whose controlled output signal is applied first to an a. c. /d. c. converter and then to an integrator circuit. A first voltage comparator receives the integrated signal to drive a relay for activating an alarm when a threshold is exceeded. A second voltage comparator having a lower reference voltage applied thereto drives an RC timer circuit whose output signal is applied to the gate of a field effect transistor of variable impedance for varying the gain of the operational amplifier. An alternative embodiment includes a dual gate transistor for use in the gain controlled amplification of the loop. The timer circuit is continually charging or discharging and the feedback loop thereby increases or decreases the gain of the amplifier to maintain a constant output value.

US Patent:

39551717, May 4, 1976

Filed:

Sep 25, 1970

Appl. No.:

5/075662

Inventors:

Alexander E. Skoures - Philadelphia PA
Joseph N. Farace - Maple Shade NJ

Assignee:

The United States of America as represented by the Secretary of the Navy - Washington DC

International Classification:

G01S 966
G08B 1316

US Classification:

340 3D

Abstract:

A bistatic velocity detector system for underwater detection of objects of redetermined magnitude wherein the water may be capable of continual variations in velocity. The system includes a compensator that has an automatic gain controlled amplifier whose controlled output signal is applied first to an a. c. /d. c. converter and then to an integrator circuit. A first voltage comparator receives the integrated signal to drive a relay for activating an alarm when a threshold is exceeded. A second voltage comparator having a lower reference voltage applied thereto drives an RC timer circuit whose output signal is applied to the gate of a field effect transistor of variable impedance for varying the gain of the operational amplifier. An alternative embodiment includes a dual gate transistor for use in the gain controlled amplification of the loop. The timer circuit is continually charging or discharging and the feedback loop thereby increases or decreases the gain of the amplifier to maintain a constant output value.