Title :
A Precision TVG for Echo Ranging Sonar
Author :
Heemstra, Frank W.
Author_Institution :
Naval Res. Lab., Washington, DC, USA
Abstract :
A sonar Time Varied Gain (TVG) circuit was designed in which the gain, as a function of time, is mathematically predetermined by theoretical equations that are programmed into the circuit by analog techniques. Essential to the design is a voltage controlled ac resistance device consisting of a transformer and two diodes. Use of this device as the output circuit of an amplifier results in a gain that, in decibels, is a linear function of the dc control voltage. This equivalence of decibels and dc voltages enables a simple analog computing circuit to satisfy the theoretical gain equations.
Keywords :
amplifiers; echo; sonar; DC control voltage; amplifier; analog computing circuit; analog techniques; diodes; echo ranging sonar; linear function; precision TVG circuit; sonar time varied gain circuit; transformer; voltage controlled AC resistance device; Artificial intelligence; Circuits; Current measurement; Diodes; Electrical resistance measurement; Gain control; Impedance; Linearity; Video recording; Voltage control;
Conference_Titel :
OCEANS '80
Conference_Location :
Seattle, WA
DOI :
10.1109/OCEANS.1980.1151414
