US3777270A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Precision variable pulse rate nulling radiometer
Assignee: Boeing North American Inc
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Filing: 1972-05-12
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Granted: 1973-12-04
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Expires: 1992-05-12
Abstract
Abstract A radiometer system comprising an antenna; a reference signal source; sampling means connected to receive and alternately pass signals from said antenna and from said reference source; a constant amplitude noise source; switch means connected to add the output of said noise source to the signals from said antenna before said signals from said antenna are applied to said sampling means; a constant temperature enclosure enclosing said reference source, said sampling means, said noise source, and said switch means, and maintaining the enclosed components at a known temperature; comparison means connected to receive and compare the signals passed by said sampling means and to emit an error signal indicative of any difference between the signals from said reference source and the sum of the signals from said antenna and the output of said noise source; and means responsive to said error signal for controlling actuation of said switch.
Inventors
- 👤 W Hardy
- 👤 K Gray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:01
CPC Classifications
G; G01; G01K; G01K11/00; G01K11/006; G01R; G01R29/00; G01R29/08; G01R29/0807; G01R29/0814; G01R29/0857
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
141 words
A radiometer circuit comprising: an antenna; a reference signal source; sampling means connected to receive signals from said antenna and signals from said reference signal source and serving to alternately pass said signals; a constant amplitude noise source; switch means Connected to add the output of said noise source to the signals from said antenna before said signals from said antenna are applied to said sampling means; comparison means connected to receive and compare the signals passed by said sampling means and to emit an error signal indicative of any difference between the signals from said reference signal source and the sum of the signals from said antenna and the output of said noise source; and pulse generating means serving to supply pulses of uniform width to actuate said switch at a frequency determined by the magnitude of said error signal.
Claim 2
Dependent Claim
141 words
A radiometer circuit comprising: an antenna; a reference signal source; sampling means connected to receive signals from said antenna and signals from said reference signal source and serving to alternately pass said signals; a constant amplitude noise source; switch means Connected to add the output of said noise source to the signals from said antenna before said signals from said antenna are applied to said sampling means; comparison means connected to receive and compare the signals passed by said sampling means and to emit an error signal indicative of any difference between the signals from said reference signal source and the sum of the signals from said antenna and the output of said noise source; and pulse generating means serving to supply pulses of uniform width to actuate said switch at a frequency determined by the magnitude of said error signal.
Claim 3
Independent Claim
153 words
The method of radiometry comprising the steps of: A. Sensing radiation from a target object and establishing a first electrical signal indicative of said radiation, B. establishing a second electrical signal indicative of a known condition, C. sampling said first and second electrical signals during alternate intervals, D. establishing a voltage signal indicative of the difference in magnitude between the signals sampled during said alternate intervals, E. generating a constant amplitude noise signal, F. passing uniform width pulses of said noise signal at a frequency determined by and indicative of said voltage signal, G. adding said pulses of said noise signal to said first signal, H. repeating steps C, D, F, and G until the magnitude of the sum of said first signal and said noise pulses is equal to the magnitude of said second signal, and I. indicating the frequency of said noise pulses required to maintain the equality of step H.
Claim 4
Independent Claim
153 words
The method of radiometry comprising the steps of: A. Sensing radiation from a target object and establishing a first electrical signal indicative of said radiation, B. establishing a second electrical signal indicative of a known condition, C. sampling said first and second electrical signals during alternate intervals, D. establishing a voltage signal indicative of the difference in magnitude between the signals sampled during said alternate intervals, E. generating a constant amplitude noise signal, F. passing uniform width pulses of said noise signal at a frequency determined by and indicative of said voltage signal, G. adding said pulses of said noise signal to said first signal, H. repeating steps C, D, F, and G until the magnitude of the sum of said first signal and said noise pulses is equal to the magnitude of said second signal, and I. indicating the frequency of said noise pulses required to maintain the equality of step H.
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) | 1976-12-03 | 1977-06-04 | 1977-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-03 | 1981-06-04 | 1981-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-03 | 1985-06-04 | 1985-12-04 | $7700.00 | Window Closed / Lapsed |