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US3577145A
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Radar system spin echo correlator
Assignee: Individual
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Filing: 1969-08-13
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Granted: 1971-05-04
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Expires: 1989-08-13
Abstract
Abstract The spin properties of paramagnetic materials are utilized to provide a correlator of radar signals. Paramagnetic materials having an in homogeneous resonance line and relatively long spinspin and spin-lattice relaxation times such as phosphorous-doped silicon are placed into a coupling structure which couples RF energy to the magnetic spin system. Such a structure can be a simple tuned LC oscillator for low-frequency operation or a microwave cavity or slow wave structure for microwave operation.
Inventors
- 👤 Robert A Worden
- 👤 Hugh H Hair
- 👤 Carl W Gerst
- 👤 Benadict Viglietta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:06
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/02; G01S13/06; G01S13/08; G01S13/10; G01S13/26; G01S13/28
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
79 words
In combination with a radar system, signal correlator means comprising spin echo pulse compression means, means for generating and delivering thereto a 90* prepulse signal, means for obtaining a sample of an RF signal transmitted by said radar system, means connected thereto for reversing said sample in time, means for delivering said time-rEversed sample of said pulse compression means for storage therein, and means for delivering the received echo pulse of said transmitted signal to said pulse compressor means.
Claim 2
Dependent Claim
79 words
In combination with a radar system, signal correlator means comprising spin echo pulse compression means, means for generating and delivering thereto a 90* prepulse signal, means for obtaining a sample of an RF signal transmitted by said radar system, means connected thereto for reversing said sample in time, means for delivering said time-rEversed sample of said pulse compression means for storage therein, and means for delivering the received echo pulse of said transmitted signal to said pulse compressor means.
Claim 3
Dependent Claim
67 words
Signal correlator means as defined in claim 1 wherein said spin echo pulse compressor means comprises a quarter wavelength coaxial cavity filled with paramagnetic material, means for applying a DC magnetic field in the z direction of said paramagnetic material, and, coaxial means for coupling said RF signal samples to said cavity such that the RF magnetic field is in the theta direction of said paramagnetic material.
Claim 4
Dependent Claim
75 words
Signal correlator means as defined in claim 2 wherein the RF magnetic field amplitude of stored RF signal samples is substantially less than the inhomogeneous line width of said paramagnetic material, the spectral widths of said RF samples and said received echo pulses are less than the inhomogeneous line width of said paramagnetic material, said 90* prepulse signal satisfies the condition the RF signal sample duration is less than the paramagnetic material spin-spin relaxation time.
Claim 5
Dependent Claim
15 words
Signal correlator means as defined in claim 3 wherein said paramagnetic material comprises phosphorous-doped silicon.
References Cited (Backward Citations)
US3265961A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-03 | 1974-11-02 | 1975-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-03 | 1978-11-02 | 1979-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-03 | 1982-11-02 | 1983-05-04 | $7700.00 | Window Closed / Lapsed |