US3705381A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resonant target sonar system
Assignee: United States Department of the Navy
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Filing: 1968-03-12
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Granted: 1972-12-05
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Expires: 1988-03-12
Abstract
Abstract A sonar system having a first broadcaster for generating and broadcasting a predetermined frequency search signal toward a target to be located and classified and a second broadcaster for generating and broadcasting a second signal having a frequency substantially the same as the resonant frequency of the type of target being hunted for effecting the vibration thereof at its resonant frequency. A programmer connected to said first and second broadcasters in such manner as to effect the broadcast of said second signal, so as to vibrate said target a predetermined period of time before, during, and after the broadcast of alternate ones of said search signal. A receiver having a filter for filtering out said second signal after both said search and second signals have been reflected as unmodulated and vibration modulated signals from said target, a delay for delaying said filtered signal an amount such that the unmodulated and modulated portions thereof coincide in time, a subtractor for producing a signal representing the difference between said unmodulated and modulated signals, and a readout for displaying said difference signal in terms of the characteristics of the aforesaid target.
Inventors
- 👤 Edward L Pipkin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:15
CPC Classifications
G; G01; G01S; G01S15/00; G01S15/02
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
195 words
A sonar system comprising in combination: means for timely broadcasting a first frequency signal in search of a subaqueous target; means for timely broadcasting a second frequency signal toward said subaqueous target, with the frequency thereof substantially similar to the resonant frequency of said target; means connected to said first and second frequency signal broadcasting means for effecting the broadcast of said first and second frequency signals at such times and for such durations, respectively, that the second thereof vibrates said target at the same time every other one of the first thereof reflects therefrom in accordance with a predetermined program; means for receiving said first and second frequency signals after they have been reflected from said target; means connected to the output of said receiving means for producing signals representing the difference between the first frequency echo signals reflected from said target while it is being resonated by said second frequency signal and the first frequency echo signals reflected from said targets while it is not being resonated by said second frequency signal; and means connected to the output of said representative difference signal producing means for reading out the representative difference signal therefrom.
Claim 2
Dependent Claim
195 words
A sonar system comprising in combination: means for timely broadcasting a first frequency signal in search of a subaqueous target; means for timely broadcasting a second frequency signal toward said subaqueous target, with the frequency thereof substantially similar to the resonant frequency of said target; means connected to said first and second frequency signal broadcasting means for effecting the broadcast of said first and second frequency signals at such times and for such durations, respectively, that the second thereof vibrates said target at the same time every other one of the first thereof reflects therefrom in accordance with a predetermined program; means for receiving said first and second frequency signals after they have been reflected from said target; means connected to the output of said receiving means for producing signals representing the difference between the first frequency echo signals reflected from said target while it is being resonated by said second frequency signal and the first frequency echo signals reflected from said targets while it is not being resonated by said second frequency signal; and means connected to the output of said representative difference signal producing means for reading out the representative difference signal therefrom.
Claim 3
Dependent Claim
88 words
The device of claim 1 wherein said means for broadcasting a first frequency signal in search of a subaqueous target comprises: a first oscillator for producing a predetermined frequency signal at the output thereof; a gate having a data input and a control input, with the data input thereof connected to the output of said variable oscillator, and the control input thereof adapted for opening and closing said gate in response to predetermined signals applied thereto; and a transducer effectively connected to the output of the aforesaid gate.
Claim 4
Dependent Claim
113 words
The device of claim 1 wherein said means for broadcasting a second frequency signal toward said subaqueous target, with the frequency thereof substantially similar to the resonant frequency of said target, comprises: a variable oscillator for producing a predetermined frequency signal at the output thereof which is substantially the same as the resonant frequency of the target being hunted; a gate having a data input and a control input, with the data input thereof connected to the output of said variable oscillator, and the control input thereof adapted for opening and closing said gate in response to predetermined signals applied thereto; and a transducer effectively connected to the output of the aforesaid gate.
Claim 5
Dependent Claim
27 words
The device of claim 1 wherein said means for receiving said first and second frequency signals after they have been reflected from said target comprises a transducer.
Claim 6
Dependent Claim
170 words
The device of claim 1 wherein said means connected to said first and second frequency signal broadcasting means for effecting the broadcast of said first and second frequency signals at such times and for such durations, respectively, that the second thereof vibrates said target at the same time every other one of the first thereof reflects therefrom in accordance with a predetermined program, comprises: a variable free-running multivibrator; a differentiator connected to the output of said variable free-running multivibrator; a variable monostable multivibrator having an input and an output, with the input thereof connected to the output of said differentiaTor and the output thereof connected to the time control input of the aforesaid first frequency signal broadcasting means; a divide-by-two circuit means connected to the output of said differentiator; and a delay means having an input and an output, with the input thereof connected to the output of said divide-by-two circuit means and the output thereof connected to the time control input of the aforesaid second frequency signal broadcasting means.
Claim 7
Dependent Claim
27 words
The device of claim 5 wherein said divide-by-two circuit means comprises: a variable bistable multivibrator; and a differentiator connected to the output of said variable bistable multivibrator.
Claim 8
Dependent Claim
40 words
The device of claim 5 wherein said delay means comprises: a first variable monostable multivibrator; a differentiator connected to the output of said first variable monostable multivibrator; and a second variable monostable multivibrator connected to the output of said differentiator.
Claim 9
Dependent Claim
125 words
The device of claim 1 wherein said means connected to the output of said receiving means for producing signals representing the difference between the first frequency echo signals reflected from said target while it is being resonated by said second frequency signal and the first frequency echo signals reflected from said target while it is not being resonated by said second frequency signal comprises: a filter for filtering out said second frequency signal; a variable delay means connected to the output of said filter; and a difference circuit having a pair of inputs and an output, with one of the inputs thereof connected to the output of said filter and with the other input thereof connected to the output of the aforesaid variable delay means.
Claim 10
Dependent Claim
20 words
The invention according to claim 8 further characterized by a readout effectively connected to the output of said difference circuit.
Claim 11
Dependent Claim
26 words
The invention according to claim 9 further characterized by a variable thresholder connected between the output of said difference circuit and the input of said readout.
Claim 12
Dependent Claim
432 words
An echo-search-ranging system for detecting and classifying a target located within a predetermined environmental medium comprising in combination: a first variable oscillator for producing a given frequency signal at the output thereof; a first gate having a data input and a control input, with the data input thereof connected to the output of said first variable oscillator; a variable amplifier connected to the output of said gate; a first transmitting transducer connected to the output of said first variable amplifier; a second variable oscillator for producing a given frequency signal at the output thereof, the frequency of which is substantially the same as the resonant frequency of the target to be detected and classified; a second gate having a data input and a control input with the data input thereof connected to the output of said second variable oscillator; a second variable amplifier connected to the output of said first gate; a second transmitting transducer connected to the output of said second variable amplifier; a variable astable multivibrator; a first differentiator connected to the output of said variable astable multivibrator; a first variable monostable multivibrator connected between the output of said first differentiator and the control input of said first gate; a variable bistable multivibrator connected to the output of said first differentiator; a second differentiator connected to the output of said variable bistable multivibrator; a second monostable multivibrator connected to the output of said second differentiator; a third differentiator connected to the output of said second monostable multivibrator; a third variable monostable multivibrator having an input and an output, with the input thereof connected to the output of said third differentiator and the output thereof connected to the control input of said second gate; a receiving transducer; a third variable amplifier connected to the output of said receiving transducer; a filter connected to the output with said third variable amplifier for filtering out the signal frequency generated by the aforementioned second variable oscillator; a delay line connected to the output of said filter; a difference circuit having a pair of inputs and an output, with one of the inputs thereof connected to the output of said filter, and with the other input thereof connected to the output of said variable delay line; a variable thresholder connected to the output of said difference circuit; a readout having a data input and a synchronization input, with the data input thereof connected to the output of the aforementioned variable thresholder; and means connected between the output of said second variable amplifier and the synchronization input of said readout for timely supplying synchronization signals thereto.
Claim 13
Dependent Claim
432 words
An echo-search-ranging system for detecting and classifying a target located within a predetermined environmental medium comprising in combination: a first variable oscillator for producing a given frequency signal at the output thereof; a first gate having a data input and a control input, with the data input thereof connected to the output of said first variable oscillator; a variable amplifier connected to the output of said gate; a first transmitting transducer connected to the output of said first variable amplifier; a second variable oscillator for producing a given frequency signal at the output thereof, the frequency of which is substantially the same as the resonant frequency of the target to be detected and classified; a second gate having a data input and a control input with the data input thereof connected to the output of said second variable oscillator; a second variable amplifier connected to the output of said first gate; a second transmitting transducer connected to the output of said second variable amplifier; a variable astable multivibrator; a first differentiator connected to the output of said variable astable multivibrator; a first variable monostable multivibrator connected between the output of said first differentiator and the control input of said first gate; a variable bistable multivibrator connected to the output of said first differentiator; a second differentiator connected to the output of said variable bistable multivibrator; a second monostable multivibrator connected to the output of said second differentiator; a third differentiator connected to the output of said second monostable multivibrator; a third variable monostable multivibrator having an input and an output, with the input thereof connected to the output of said third differentiator and the output thereof connected to the control input of said second gate; a receiving transducer; a third variable amplifier connected to the output of said receiving transducer; a filter connected to the output with said third variable amplifier for filtering out the signal frequency generated by the aforementioned second variable oscillator; a delay line connected to the output of said filter; a difference circuit having a pair of inputs and an output, with one of the inputs thereof connected to the output of said filter, and with the other input thereof connected to the output of said variable delay line; a variable thresholder connected to the output of said difference circuit; a readout having a data input and a synchronization input, with the data input thereof connected to the output of the aforementioned variable thresholder; and means connected between the output of said second variable amplifier and the synchronization input of said readout for timely supplying synchronization signals thereto.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-12-05 | 1976-06-05 | 1976-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-05 | 1980-06-05 | 1980-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-05 | 1984-06-05 | 1984-12-05 | $7700.00 | Window Closed / Lapsed |