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US 3,943,482 AGranted
Marine mine detector
AssigneeThe United States of America as represented by the Secretary of the Navy
InventorsFrancis J. Murphree, Henry L. Warner, Edward G. McLeroy, Jr.
Life of this patent
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Abstract
A sonar system for detecting and identifying objects laying on or submerged n a sea floor having a dual frequency transmitter and a dual frequency receiver for timely broadcasting and receiving a pair of relatively high and low frequency acoustical signals, respectively, in accordance with a predetermined timing program which facilitates the display and interpretation thereof.
Claims10
An echo-search system, comprising in combination:
- means for broadcasting a predetermined plurality of target search signals, each of which has a frequency different from that of the others;
- means for timely receiving said plurality of target search signals after they have been reflected from a target;
- means connected to said receiving means for separating said received plurality of target search signals into the component signals thereof according to their individual broadcast frequencies;
- means effectively coupled to the output of said received signal separating means for successively gating the individual frequency component signals thereof;
- programmer means connected to said broadcasting means and to the aforesaid gating means for effecting the broadcast of said target search signals and the gating of the aforesaid received individual frequency component signals thereof, respectively, in accordance with a predetermined program, said programmer means including a variable master pulse generator, with the output thereof effectively connected to the inputs of said gating means;
- a range time base generator connected to the output of said variable master pulse generator;
- a first differentiator connected to the output of said range time base generator;
- a variable monostable multivibrator having an input and an output, with the input thereof connected to the output of said first differentiator, and with the output thereof effectively connected to an input of said broadcasting means for timely initiating the broadcast of said predetermined plurality of target search signals;
- a second differentiator coupled to the output of said variable monostable multivibrator;
- and a variable delay line having a pair of inputs and an output, with one of the inputs thereof adapted for regulating the delay period thereof in response to a predetermined signal, with the other input thereof connected to the output of said second differentiator, and with the output thereof connected to the trigger input of the aforesaid variable master pulse generator:
- and
- means coupled to the outputs of said gating means for reading out the successively gated individual frequency component signals therefrom.
9 more elements
A sonar system comprising in combination:
- a transducer for broadcasting acoustical energy within a subaqueous medium in response to an electrical signal and for producing an electrical signal in response to an acoustical signal received from within said subaqueous medium;
- a first oscillator for generating a first electrical signal having a predetermined frequency;
- a second oscillator for generating a second electrical signal having a lower frequency than that of said first electrical signal;
- means effectively connected between the outputs of said first and second oscillators and the input of said transducer for timely gating said first and second electrical signals thereto;
- means effectively connected to the output of said transducer for only passing a third signal having a frequency that is the same as the frequency of said first electrical signal;
- means effectively connected to the output of said transducer for only passing a fourth signal having a frequency that is the same as the frequency of said second electrical signal;
- a readout means;
- means effectively connected between the outputs of said third and fourth signal passing means and the input of said readout means for timely and respectively gating the aforesaid passed third and fourth frequency signals thereto;
- a variable master pulse generator, with the output thereof effectively connected to the control inputs of said third and fourth signal gating means;
- a variable range time base generator connected to the output of said variable master pulse generator;
- a first differentiator connected to the output of said variable range time base generator;
- a variable monostable multivibrator having an input and an output, with the input thereof connected to the output of said first differentiator, and with the output thereof effectively connected to the control inputs of said first and second electrical signal gating means;
- a second differentiator coupled to the output of said variable monostable multivibrator;
- and
- a variable delay line having a pair of inputs and an output, one input of which is an input for regulating the delay period thereof in response to a predetermined signal, the other input of which is coupled to the output of said second differentiator, and the output of which is connected to the trigger input of the aforesaid variable master pulse generator.
12 more elements
Dependencies are inferred from the claim text.