Patent US2776531A successfully refreshed from Google Patents.
US4253166A
Expired / Lapsed
US
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Target location systems
Assignee: BAE Systems Electronics Ltd
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Filing: 1979-04-12
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Granted: 1981-02-24
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Expires: 1999-04-12
Abstract
Abstract A target location system comprising a signal transmitter including a pair of signal transmitter transducers arranged in spaced apart relationship and means for driving the transducers with transmitter pulse signals at the frequencies Fo and Fo+Fb respectively which are arranged to increase progressively in frequency during each pulse to Fo+Δf and Fo+Fb+Δf respectively where Δf is equal to or less than Fb, and an echo signal receiver comprising receiving transducer means feeding a filter bank, the filter bank comprising a plurality of filters which cover in aggregate a predetermined frequency band, each filter being adapted to cover one slot or section of the band whereby the bearing of a target from which an echo signal of a transmitter pulse signal is received, is indicated in accordance with the slot or slots in which the echo signal is received.
Inventors
- 👤 Phillip L. M. Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:19
CPC Classifications
G; G01; G01S; G01S1/00; G01S1/02; G01S1/08; G01S1/20; G01S1/22; G01S1/72; G01S1/76; G01S1/80; G01S1/802; G01S13/00; G01S13/02; G01S13/06
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
137 words
A target location system comprising a signal transmitter including a pair of signal transmitter transducers arranged in spaced apart relationship, means for driving the transducers with transmitter pulse signals at the frequencies Fo and Fo+Fb respectively which are arranged to increase progressively in frequency during each pulse to Fo+Δf and Fo+Fb+Δf respectively, where Δf is equal to or less than Fb, and an echo signal receiver comprising receiving transducer means feeding a filter bank the filter bank comprising a plurality of filters which cover in aggregate a predetermined frequency band, each filter being adapted to cover one slot, or section of the band whereby the bearing of a target from which an echo signal of the transmitter pulse signal is received is indicated in accordance with the slot or slots in which the echo signal is received.
Claim 2
Dependent Claim
137 words
A target location system comprising a signal transmitter including a pair of signal transmitter transducers arranged in spaced apart relationship, means for driving the transducers with transmitter pulse signals at the frequencies Fo and Fo+Fb respectively which are arranged to increase progressively in frequency during each pulse to Fo+Δf and Fo+Fb+Δf respectively, where Δf is equal to or less than Fb, and an echo signal receiver comprising receiving transducer means feeding a filter bank the filter bank comprising a plurality of filters which cover in aggregate a predetermined frequency band, each filter being adapted to cover one slot, or section of the band whereby the bearing of a target from which an echo signal of the transmitter pulse signal is received is indicated in accordance with the slot or slots in which the echo signal is received.
Claim 3
Dependent Claim
23 words
A target location system as claimed in claim 1 wherein the transducers are arranged to feed the filter bank via an envelope detector.
Claim 4
Dependent Claim
24 words
A target location system as claimed in any one of claims 1 and 2, wherein the signal transmitter transducers are adapted for sonar applications.
Claim 5
Dependent Claim
27 words
A target location system as claimed in any one of claims 1 and 2 wherein the signal transmitter transducers are adapted for use in a radar system.
Claim 6
Dependent Claim
102 words
A target location system comprising a signal transmitter including a pair of signal transmitter transducers arranged in spaced apart relationship, means for driving the transducers with transmitter pulse signals at the frequencies Fo and Fo+Fb, respectively, which are arranged to increase progressively in frequency during each pulse to Fo+Δf and Fo+Fb+Δf, respectively, where Δf is equal to or less than Fb, and an echo signal receiver comprising receiving transducer means feeding frequency detector means operative to provide an indication of a target bearing in dependence upon the difference frequency between transmitted pulses reflected contemporaneously from the target to the receiving transducer means.
Claim 7
Dependent Claim
102 words
A target location system comprising a signal transmitter including a pair of signal transmitter transducers arranged in spaced apart relationship, means for driving the transducers with transmitter pulse signals at the frequencies Fo and Fo+Fb, respectively, which are arranged to increase progressively in frequency during each pulse to Fo+Δf and Fo+Fb+Δf, respectively, where Δf is equal to or less than Fb, and an echo signal receiver comprising receiving transducer means feeding frequency detector means operative to provide an indication of a target bearing in dependence upon the difference frequency between transmitted pulses reflected contemporaneously from the target to the receiving transducer means.
Claim 8
Dependent Claim
19 words
A target location system as claimed in claim 5, wherein the signal transmitter transducers are adapted for sonar applications.
Claim 9
Dependent Claim
27 words
A target location system as claimed in any one of claims 5 and 6, wherein the signal transmitter transducers are adapted for use in a radar system.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-02-24 | 1984-08-25 | 1985-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-24 | 1988-08-25 | 1989-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-24 | 1992-08-25 | 1993-02-24 | $7700.00 | Window Closed / Lapsed |