US3671657A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Echo synthesizing apparatus
Assignee: United States Department of the Navy
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Filing: 1970-12-01
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Granted: 1972-06-20
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Expires: 1990-12-01
Abstract
Abstract Echo synthesizing apparatus utilizing a fixed delay line having spaced taps connected to attenuators by gate means which are operated in an aspect dependent manner by shift registers so as to generate across an output resistor a composite echo signal having aspect dependent highlight characteristics. Embodiments providing also random and/or systematic variations as well as self-showing effects are described.
Inventors
- 👤 Francis J Murphree
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:18
CPC Classifications
G; G01; G01S; G01S7/00; G01S7/52; G01S7/52004; G09; G09B; G09B9/00; G09B9/56
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
418 words
In a sonar echo simulation system including a soUrce of operational sonar signals and a source of target aspect dependent signals, echo synthesizing apparatus comprising: delay line means connected to receive said operational signals, said delay line means having a plurality of taps therealong located at predetermined intervals; an output resistor; a plurality of bow aspect highlight determining attenuators each having its output connected to said resistor; a plurality of stern aspect highlight determining attenuators each having its output connected to said resistor; a plurality of bow aspect gates each operative when enabled to pass signals from one of said taps to the input of one of said bow aspect highlight determining attenuators; a plurality of stern aspect gates each operative when enabled to pass signals from one of said taps to the input of one of said stern aspect highlight determining attenuators; bow aspect gate enabling first and second shift registers, said first shift register having a predetermined number of stages each connected to one of said bow gates, and said second shift register having a different number of stages each connected to a remaining one of said bow gates; first and second divider means connected to receive said aspect dependent signals and operative to drive said first and second shift registers respectively so that substantially all of said bow aspect gates are enabled when said aspect dependent signals correspond to an extreme bow on aspect, whereas progressively fewer of said bow aspect gates are enabled, working inwardly from opposite ends of the delay line as said aspect dependent signals change to correspond to changes in said aspect toward a beam aspect; stern aspect gate enabling third and fourth shift registers, said third shift register having a predetermined number of stages each connected to one of said stern gates, and said fourth register having a different number of stages each connected to a remaining one of said stern gates; and third and fourth divider means connected to receive said aspect dependent signals and operative to drive said third and fourth shift registers respectively so that substantially all of said stern aspect gates are enabled when said aspect dependent signals correspond to an extreme stern on aspect whereas progressively fewer of said stern aspect gates are enabled, working inwardly from opposite ends of said delay line, as said aspect dependent signals change to correspond to changes in aspect toward a beam aspect; whereby a composite aspect dependent simulated echo signal having highlights is generated across said output resistor.
Claim 2
Dependent Claim
418 words
In a sonar echo simulation system including a soUrce of operational sonar signals and a source of target aspect dependent signals, echo synthesizing apparatus comprising: delay line means connected to receive said operational signals, said delay line means having a plurality of taps therealong located at predetermined intervals; an output resistor; a plurality of bow aspect highlight determining attenuators each having its output connected to said resistor; a plurality of stern aspect highlight determining attenuators each having its output connected to said resistor; a plurality of bow aspect gates each operative when enabled to pass signals from one of said taps to the input of one of said bow aspect highlight determining attenuators; a plurality of stern aspect gates each operative when enabled to pass signals from one of said taps to the input of one of said stern aspect highlight determining attenuators; bow aspect gate enabling first and second shift registers, said first shift register having a predetermined number of stages each connected to one of said bow gates, and said second shift register having a different number of stages each connected to a remaining one of said bow gates; first and second divider means connected to receive said aspect dependent signals and operative to drive said first and second shift registers respectively so that substantially all of said bow aspect gates are enabled when said aspect dependent signals correspond to an extreme bow on aspect, whereas progressively fewer of said bow aspect gates are enabled, working inwardly from opposite ends of the delay line as said aspect dependent signals change to correspond to changes in said aspect toward a beam aspect; stern aspect gate enabling third and fourth shift registers, said third shift register having a predetermined number of stages each connected to one of said stern gates, and said fourth register having a different number of stages each connected to a remaining one of said stern gates; and third and fourth divider means connected to receive said aspect dependent signals and operative to drive said third and fourth shift registers respectively so that substantially all of said stern aspect gates are enabled when said aspect dependent signals correspond to an extreme stern on aspect whereas progressively fewer of said stern aspect gates are enabled, working inwardly from opposite ends of said delay line, as said aspect dependent signals change to correspond to changes in aspect toward a beam aspect; whereby a composite aspect dependent simulated echo signal having highlights is generated across said output resistor.
Claim 3
Dependent Claim
56 words
Echo synthesizing apparatus as defined in claim 1, and wherein: said attenuators each comprise a voltage controlled variable resistance means; said apparatus further comprising a source of randomly varying voltages; and said voltage controlled variable resistance means being responsive to said randomly varying voltages to alter the amplitudes of said highlights of said composite echo signal.
Claim 4
Dependent Claim
78 words
Echo synthesizing apparatus as defined in claim 1, and further comprising: voltage controlled phase shifter means connected to receive said composite echo signal; a second output resistor connected to receive said composite echo signal; and logic means connected to receive said target aspect dependent signals and operative in response thereto to provide an aspect dependent, systematically varying voltage output to said second output resistor; whereby a systematically varying composite echo signal is developed across said second output resistor.
Claim 5
Dependent Claim
48 words
Echo synthesizing apparatus as defined in claim 1, and wherein: said first shift register comprises additional stages connected to provide inhibit inputs to predetermined ones of said bow aspect gates, whereby at extreme bow on aspects said target echo is somewhat shorter than at less extreme aspect angles.
Claim 6
Dependent Claim
78 words
Echo synthesizing apparatus as defined in claim 2, and further comprisiNg: voltage controlled phase shifter means connected to receive said composite echo signal; a second output resistor connected to receive said composite echo signal; and logic means connected to receive said target aspect dependent signals and operative in response thereto to provide an aspect dependent, systematically varying voltage output to said second output resistor; whereby a systematically varying composite echo signal is developed across said second output resistor.
Claim 7
Dependent Claim
48 words
Echo synthesizing apparatus as defined in claim 2, and wherein: said first shift register comprises additional stages connected to provide inhibit inputs to predetermined ones of said bow aspect gates, whereby at extreme bow on aspects said target echo is somewhat shorter than at less extreme aspect angles.
Claim 8
Dependent Claim
48 words
Echo synthesizing apparatus as defined in claim 3, and wherein: said first shift register comprises additional stages connected to provide inhibit inputs to predetermined ones of said bow aspect gates, whereby at extreme bow on aspects said target echo is somewhat shorter than at less extreme aspect angles.
References Cited (Backward Citations)
US3555165A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-20 | 1975-12-20 | 1976-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-20 | 1979-12-20 | 1980-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-20 | 1983-12-20 | 1984-06-20 | $7700.00 | Window Closed / Lapsed |