US3372391A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic frequency control for radar receivers
Assignee: Bell Aerospace Corp
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Filing: 1960-02-01
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Granted: 1968-03-05
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Expires: 1980-02-01
Abstract
No abstract record available.
Inventors
- 👤 Lerner Theodore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 07:46
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/02; G01S13/06; G01S13/08; G01S13/10; G01S13/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
168 words
A RADAR SYSTEM COMPRISING RADAR PULSE GENERATOR MEANS HAVING MECHANICAL PULSE-FREQUENCY VARYING MEANS; DRIVE MEANS COUPLED WITH SAID FREQUENCY VARYING MEANS FOR CHANGING THE TUNING THEREOF; PULSE ECHO RECEIVER MEANS HAVING A VOLTAGE-TUNABLE LOCAL OSCILLATOR; TRANSDUCER MEANS CONNECTED WITH SAID DRIVE MEANS FOR DELIVERING A COARSE AUTOMATIC FREQUENCY CONTROL VOLTAGE FOR SAID LOCAL OSCILLATOR, SAID VOLTAGE HAVING AN AMPLITUDE DEPENDENT UPON THE POSITION OF SAID PULSE FREQUENCY VARYING MEANS; FINE AUTOMATIC FREQUENCY CONTROL MEANS INCLUDING A MIXER RECEIVING A SAMPLE OF EACH TRANSMITTED PULSE AND THE OUTPUT OF SAID LOCAL OSCILLATOR FOR DEVELOPING AN INTERMEDIATE FREQUENCY, AN I.F. AMPLIFIER FOR AMPLIFYING SAID INTERMEDIATE FREQUENCY, A FREQUENCY DISCRIMINATOR FOR DEVELOPING A FINE AUTOMATIC FREQUENCY CONTROL VOLTAGE FOR SAID LOCAL OSCILLATOR, SAID CONTROL VOLTAGE BEING A FUNCTION OF THE DIFFERENCE IN FREQUENCY BETWEEN SAID INTERMEDIATE FREQUENCY AND THE DESIRED INTERMEDIATE FREQUENCY; AND SWITCH MEANS CONTROLLED IN STEP WITH THE RADAR PULSE GENERATOR TO CONNECT SAID CONTROL VOLTAGES TO CORRECT THE FREQUENCY OF THE LOCAL OSCILLATOR AFTER EACH ECHO-PULSE RECEIVING PERIOD.
Claim 2
Dependent Claim
168 words
A RADAR SYSTEM COMPRISING RADAR PULSE GENERATOR MEANS HAVING MECHANICAL PULSE-FREQUENCY VARYING MEANS; DRIVE MEANS COUPLED WITH SAID FREQUENCY VARYING MEANS FOR CHANGING THE TUNING THEREOF; PULSE ECHO RECEIVER MEANS HAVING A VOLTAGE-TUNABLE LOCAL OSCILLATOR; TRANSDUCER MEANS CONNECTED WITH SAID DRIVE MEANS FOR DELIVERING A COARSE AUTOMATIC FREQUENCY CONTROL VOLTAGE FOR SAID LOCAL OSCILLATOR, SAID VOLTAGE HAVING AN AMPLITUDE DEPENDENT UPON THE POSITION OF SAID PULSE FREQUENCY VARYING MEANS; FINE AUTOMATIC FREQUENCY CONTROL MEANS INCLUDING A MIXER RECEIVING A SAMPLE OF EACH TRANSMITTED PULSE AND THE OUTPUT OF SAID LOCAL OSCILLATOR FOR DEVELOPING AN INTERMEDIATE FREQUENCY, AN I.F. AMPLIFIER FOR AMPLIFYING SAID INTERMEDIATE FREQUENCY, A FREQUENCY DISCRIMINATOR FOR DEVELOPING A FINE AUTOMATIC FREQUENCY CONTROL VOLTAGE FOR SAID LOCAL OSCILLATOR, SAID CONTROL VOLTAGE BEING A FUNCTION OF THE DIFFERENCE IN FREQUENCY BETWEEN SAID INTERMEDIATE FREQUENCY AND THE DESIRED INTERMEDIATE FREQUENCY; AND SWITCH MEANS CONTROLLED IN STEP WITH THE RADAR PULSE GENERATOR TO CONNECT SAID CONTROL VOLTAGES TO CORRECT THE FREQUENCY OF THE LOCAL OSCILLATOR AFTER EACH ECHO-PULSE RECEIVING PERIOD.
References Cited (Backward Citations)
US2603744A
Cited
US2856600A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-03-05 | 1971-09-04 | 1972-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-03-05 | 1975-09-04 | 1976-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-03-05 | 1979-09-04 | 1980-03-05 | $7700.00 | Window Closed / Lapsed |