US3899666A
Expired / Lapsed
US
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Integral correlation and transverse equalization method and apparatus
Assignee: RCA Corp
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Filing: 1973-10-24
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Granted: 1975-08-12
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Expires: 1993-10-24
Abstract
Abstract An apparatus providing integrally combined correlation and transversal equalization functions. A preferred form of the apparatus in a single structure comprises a surface wave acoustical device. Illustrative uses include suppressed sidelobe correlators of radartype signals including phase coded signals.
Inventors
- 👤 Thomas Vincent Bolger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:31
CPC Classifications
G; G06; G06G; G06G7/00; G06G7/12; G06G7/19; G06G7/195
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
213 words
An apparatus for correlating a continuous input phase-coded analog signal comprising a carrier with phase coded modulations and simultaneously suppressing time sidelobes resulting from said correlation to a predetermined level, said apparatus having input means including an input electro-acoustic surface wave device responsive to said input phase-coDed analog signal for generating an acoustical surface wave, said input device being arranged as a filter matched to said carrier of said analog signal, said input surface wave device being deposited on a substrate capable of supporting an acoustical surface wave, comprising: an electro-acoustic surface wave device formed of a set of interdigitated comb-shaped electrodes deposited on said substrate in position relative to said input means to receive an acoustical surface wave therefrom, and to generate in response to said surface wave an electrical signal having a spectral response in accordance with the relative spacing and overlap of said electrodes, output means coupled to said electrodes to provide an instantaneous output electrical signal from said lastmentioned device in continuous response to said surface wave, said output electrical signal being equal to a compressed form of said input analog signal and having time sidelobes below said predetermined level, the spacing and overlap of said electrodes being arranged in accordance with a weighting function f3(t) having the form,
Claim 2
Independent Claim
213 words
An apparatus for correlating a continuous input phase-coded analog signal comprising a carrier with phase coded modulations and simultaneously suppressing time sidelobes resulting from said correlation to a predetermined level, said apparatus having input means including an input electro-acoustic surface wave device responsive to said input phase-coDed analog signal for generating an acoustical surface wave, said input device being arranged as a filter matched to said carrier of said analog signal, said input surface wave device being deposited on a substrate capable of supporting an acoustical surface wave, comprising: an electro-acoustic surface wave device formed of a set of interdigitated comb-shaped electrodes deposited on said substrate in position relative to said input means to receive an acoustical surface wave therefrom, and to generate in response to said surface wave an electrical signal having a spectral response in accordance with the relative spacing and overlap of said electrodes, output means coupled to said electrodes to provide an instantaneous output electrical signal from said lastmentioned device in continuous response to said surface wave, said output electrical signal being equal to a compressed form of said input analog signal and having time sidelobes below said predetermined level, the spacing and overlap of said electrodes being arranged in accordance with a weighting function f3(t) having the form,
Claim 3
Dependent Claim
31 words
An apparatus according to claim 1, wherein said first weighting function is the weighting function of a correlator and said second weighting function is the weighting function of a transversal equalizer.
Claim 4
Dependent Claim
31 words
An apparatus according to claim 1, wherein said first weighting function is the weighting function of a transversal equalizer and said second weighting function is the weighting function of a correlator.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-11 | 1979-02-10 | 1979-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-11 | 1983-02-10 | 1983-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-11 | 1987-02-10 | 1987-08-12 | $7700.00 | Window Closed / Lapsed |