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Patent US3569719A successfully refreshed from Google Patents.
US3569719A
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Infrared tracker error signal generation and processing system
Assignee: United States Department of the Navy
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Filing: 1968-01-10
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Granted: 1971-03-09
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Expires: 1988-01-10
Abstract
Abstract An infrared tracker error signal generator having a telescope containing a mirror and a scanning mechanism, the action of the latter producing on the mirror an image of an assumed point target object at infinity, which image is scanned across the surface of a detector element in a pattern prescribed by the input commands to the scanning mechanism to produce detector outputs each time the image crosses the detector, the detector outputs being processed in circuitry to develop horizontal and vertical error signals for the tracker system to bring the center of scan to the center of the detector band in the telescope.
Inventors
- 👤 Eugene H Dryden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 07:33
CPC Classifications
G; G01; G01S; G01S3/00; G01S3/78; G01S3/782; G01S3/785; G01S3/786
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
232 words
An infrared error signal generator and processing system having a telescope and scanning means to scan a target across a detector in the telescope in a rosette pattern to produce detected output error signals comprising: a first band-pass filter coupled to receive said detector output error signals to pass fundamental, second, and third harmonics thereof on an output; an automatic gain control means coupled to said first filter output to produce normalized error signals on an output; line frequency generator and rotation frequency generator means for the scanning means of the telescope; first means coupled to receive said error signals from said automatic gain control means and third harmonic signals from said line generator to produce a product of said signals on an output thereof; and second and third means coupled to receive the product output of said first means in common, one of said second and third means coupled to receive the frequency from said rotation generator shifted 90* and the other of said second and third means coupled to receive the frequency from said rotation generator directly, each second and third means producing product outputs, said second means product output being a direct current voltage representative of the x component of error of the target producing the error signal and said third means product output being a direct current voltage representative of the y component of error of the target.
Claim 2
Dependent Claim
232 words
An infrared error signal generator and processing system having a telescope and scanning means to scan a target across a detector in the telescope in a rosette pattern to produce detected output error signals comprising: a first band-pass filter coupled to receive said detector output error signals to pass fundamental, second, and third harmonics thereof on an output; an automatic gain control means coupled to said first filter output to produce normalized error signals on an output; line frequency generator and rotation frequency generator means for the scanning means of the telescope; first means coupled to receive said error signals from said automatic gain control means and third harmonic signals from said line generator to produce a product of said signals on an output thereof; and second and third means coupled to receive the product output of said first means in common, one of said second and third means coupled to receive the frequency from said rotation generator shifted 90* and the other of said second and third means coupled to receive the frequency from said rotation generator directly, each second and third means producing product outputs, said second means product output being a direct current voltage representative of the x component of error of the target producing the error signal and said third means product output being a direct current voltage representative of the y component of error of the target.
Claim 3
Dependent Claim
24 words
An infrared error signal generator and processing system as set forth in claim 1 wherein said first, second, and third means are synchronous demodulators.
Claim 4
Dependent Claim
58 words
An infrared error signal generator and processing system as set forth in claim 2 wherein said automatic gain control means is an automatic gain controlled amplifier with a feedback circuit from its output to its input having a band-pass filter in said feedback constructed and arranged to pass the fundamental and second harmonic signals of said line generator.
Claim 5
Dependent Claim
39 words
An infrared error signal generator and processing system as set forth in claim 3 wherein said line frequency generator generate frequencies that are integral multiples of each other, said rotation frequency being of lower frequency than said line frequency.
Claim 6
Dependent Claim
52 words
An infrared error signal generator and processing system as sEt forth in claim 4 wherein said coupling of said second and third synchronous demodulators in common to said first synchronous demodulator is through a band-pass filter to filter out ripple caused by the fundamental and second harmonic signals of said error signals.
Claim 7
Dependent Claim
38 words
An infrared error signal generator and processing system as set forth in claim 5 wherein said second synchronous demodulator coupled to receive the frequency from said rotation generator shifted 90* is a coupling through a 90* phase shifter.
References Cited (Backward Citations)
US3418478A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-08 | 1974-09-07 | 1975-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-08 | 1978-09-07 | 1979-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-08 | 1982-09-07 | 1983-03-09 | $7700.00 | Window Closed / Lapsed |