US3795912A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spectrum analysis radar system
Assignee: United States Department of the Air Force
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Filing: 1973-01-12
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Granted: 1974-03-05
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Expires: 1993-01-12
Abstract
Abstract A spectrum analysis radar that detects and ranges by processing the sum of the received signal from a target with each of four quadrature phase-shifted reference signals (attenuated and possibly time delayed samples of the transmitted signal). These four sum signals are power spectrum density analyzed and then differenced in pairs. The resultants, are passed through resistive matrices and summing and squaring circuits to produce separate outputs for each range increment.
Inventors
- 👤 J Pierce
- 👤 F Holt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 02:51
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/02; G01S13/06; G01S13/08; G01S13/32
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
124 words
A spectrum analysis radar system comprising a source of limited bandwidth noise signals, radar transmitting and receiving apparatus for transmitting said noise signals and receiving echo signals from radar targets intercepted thereby, a reference signal circuit connected to said source of noise signals adapted to provide a plurality of phase shifted replica reference signals for each transmitted noise signal, a first summing circuit adapted to sum each received echo signal with each of its corresponding phase shifted replica reference signals, a spectrum analyzer having multiple outputs adapted to provide a power density spectrum analysis of each summed signal, and a processing circuit adapted to effect algebraic combinations of appropriate spectrum analyzer outputs in a manner that provides target response indication in discrete range increments.
Claim 2
Dependent Claim
124 words
A spectrum analysis radar system comprising a source of limited bandwidth noise signals, radar transmitting and receiving apparatus for transmitting said noise signals and receiving echo signals from radar targets intercepted thereby, a reference signal circuit connected to said source of noise signals adapted to provide a plurality of phase shifted replica reference signals for each transmitted noise signal, a first summing circuit adapted to sum each received echo signal with each of its corresponding phase shifted replica reference signals, a spectrum analyzer having multiple outputs adapted to provide a power density spectrum analysis of each summed signal, and a processing circuit adapted to effect algebraic combinations of appropriate spectrum analyzer outputs in a manner that provides target response indication in discrete range increments.
Claim 3
Dependent Claim
31 words
A spectrum analysis radar system as defined in claim 1 wherein said reference signal circuit provides an in-phase and a 180* phase shifted replica reference signal for each transmitted noise signal.
Claim 4
Dependent Claim
30 words
A spectrum analysis radar system as defined in claim 1 wherein said reference signal circuit provides 090*, 180* and 270* phase shifted replica reference signals for each transmitted noise signal.
Claim 5
Dependent Claim
112 words
A spectrum analysis radar system as defined in claim 3 wherein said spectrum analyzer comprises a first analysis bank of multiple, parallel, narrow band filter circuits adapted to analyze the sum of echo and 0* phase shifted reference signals, a second analysis bank of multiple, parallel, narrow band filter circuits adapted to analyze the sum of echo and 90* phase shifted reference signals, a third analysis bank of multiple, parallel, narrow band filter circuits adapted to analyze the sum of echo and 180* phase shifted reference signals, and a fourth analysis bank of multiple, parallel, narrow band filter circuits adapted to analyze the sum of echo and 270* phase shifted reference signals.
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) | 1977-03-04 | 1977-09-03 | 1978-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-04 | 1981-09-03 | 1982-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-04 | 1985-09-03 | 1986-03-05 | $7700.00 | Window Closed / Lapsed |