Patent US4198634A successfully refreshed from Google Patents.
US4198634A
Expired / Lapsed
US
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Optical autocorrelator signal processor
Assignee: United States Department of the Navy
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Filing: 1971-09-30
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Granted: 1980-04-15
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Expires: 1991-09-30
Abstract
Abstract A correlation receiver for detecting and measuring the angle-of-arrival ofadio frequency signals, including two antennas, a correlation processor, and a CRT display.
Inventors
- 👤 James L. Jernigan
- 👤 Thomas F. O'Neill, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:25
CPC Classifications
G; G01; G01S; G01S3/00; G01S3/02; G01S3/14; G01S3/46; G01S3/48
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
97 words
A direction finder for measuring the arrival direction of detected radiation, and, thereby, the direction to the radiation source, comprising: a plurality of radiation receiving means, each of which is for receiving said radiation and converting said radiation into an electrical signal; means coupled to said plurality of receiving means for summing said electrical signals and providing an output of the sum; signal processing means coupled to said output of said summing and providing means for correlating said electrical signals; and display means coupled to said processing means for indicating the arrival direction of said detected radiation.
Claim 2
Dependent Claim
97 words
A direction finder for measuring the arrival direction of detected radiation, and, thereby, the direction to the radiation source, comprising: a plurality of radiation receiving means, each of which is for receiving said radiation and converting said radiation into an electrical signal; means coupled to said plurality of receiving means for summing said electrical signals and providing an output of the sum; signal processing means coupled to said output of said summing and providing means for correlating said electrical signals; and display means coupled to said processing means for indicating the arrival direction of said detected radiation.
Claim 3
Dependent Claim
49 words
The direction finder of claim 1 wherein said signal processing means includes; means for obtaining the spectrum of said summed signals, means for obtaining the power spectrum of said summed signals from said spectrum, and means for obtaining the correlation function of said summed signals from said power spectrum.
Claim 4
Dependent Claim
96 words
The direction finder of claim 2 wherein said spectrum obtaining means includes; an ultrasonic light modulator coupled to said summed electrical signals, an illumination source providing a substantially coherent, monochromatic light beam impinging on said ultrasonic light modulator at the Bragg angle, and a lens positioned in the path of the light beam exiting said ultrasonic light modulator for focusing said exiting light beam, such that ultrasonic waves are established in said light modulator in response to said summed electrical signals and said exiting light beam is said impinging light beam modulated by said ultrasonic waves.
Claim 5
Dependent Claim
33 words
The direction finder of claim 3 wherein said power spectrum obtaining means includes a vidicon positioned in the focal plane of said lens such that said focused beam is detected by said vidicon.
Claim 6
Dependent Claim
16 words
The direction finder of claim 4 wherein said correlation function obtaining means includes a digital computer.
Claim 7
Independent Claim
93 words
A method of measuring the arrival direction of detected radiation, comprising the steps of; receiving said radiation at a plurality of locations, converting said received radiation of each said location into electrical signals, combining said electrical signals, acousto-optically processing said combined signals to obtain the spectrum of said combined signals, optically processing said spectrum to obtain the power spectrum of said combined signals, electronically processing said power spectrum to obtain the correlation function of said combined signals, and displaying said correlation function, wherein said display indicates the arrival direction of said detected radiation.
Claim 8
Independent Claim
93 words
A method of measuring the arrival direction of detected radiation, comprising the steps of; receiving said radiation at a plurality of locations, converting said received radiation of each said location into electrical signals, combining said electrical signals, acousto-optically processing said combined signals to obtain the spectrum of said combined signals, optically processing said spectrum to obtain the power spectrum of said combined signals, electronically processing said power spectrum to obtain the correlation function of said combined signals, and displaying said correlation function, wherein said display indicates the arrival direction of said detected radiation.
References Cited (Backward Citations)
US3171126A
Cited
US3359409A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-04-15 | 1983-10-15 | 1984-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-04-15 | 1987-10-15 | 1988-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-04-15 | 1991-10-15 | 1992-04-15 | $7700.00 | Window Closed / Lapsed |