US3249936A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Doppler radar system
Assignee: Compagnie Francaise Thomson Houston SA
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Filing: 1964-06-16
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Granted: 1966-05-03
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Expires: 1984-06-16
Abstract
No abstract record available.
Inventors
- 👤 Henri G P Forestier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:42
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/02; G01S13/50; G01S13/58; G01S13/585; G01S13/586
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
166 words
A DOPPLER RADAR SYSTEM COMPRISING A FIRST OSCILLATOR FOR PRODUCING A CONSTANT FREQUENCY; A SECOND OSCILLATOR FOR PRODUCING A VARIABLE FREQUENCY HAVING AS A MEAN VALUE THAT OF SAID CONSTANT FREQUENCY; MEANS FOR PRODUCING A TRANSMISSION FREQUENCY IN PREDETERMINED RELATION WITH SAID CONSTANT FREQUENCY; MEANS FOR BEAMING SAID TRANSMISSION FREQUENCY AT A MOVING TARGET AND MEANS FOR RECEIVING REFLECTED ENERGY FROM THE TARGET WHICH REFLECTED ENERGY INCLUDES A DOPPLER COMPONENT PROPORTIONAL TO THE RADIAL VELOCITY OF THE TARGET; MEANS FOR PRODUCING A REFERENCE FREQUENCY; SERVO-LOOP MEANS INCLUDING MEANS FOR COMPARING THE FREQUENCY OF THE REFLECTED ENERGY WITH THE REFERENCE FREQUENCY WHEREBY TO PRODUCE AN ERROR SIGNAL AND MEANS FOR APPLYING SAID ERROR SIGNAL TO SAID SECOND OSCILLATOR TO VARY THE FREQUENCY THEREOF UNTIL SAID ERROR SIGNAL IS SUBSTANTIALLY ZERO; AND MIXER MEANS CONNECTED TO BOTH SAID FIRST AND SECOND OSCILLATORS FOR PRODUCING A DIFFERENTIAL OUTPUT SIGNAL FREQUENCY, WHEREBY SAID OUTPUT SIGNAL FREQUENCY IS A MEASURE OF SAID RADIAL VELOCITY REGARDLESS OF VARIATIONS IN SAID TRANSMISSION FREQUENCY.
Claim 2
Dependent Claim
166 words
A DOPPLER RADAR SYSTEM COMPRISING A FIRST OSCILLATOR FOR PRODUCING A CONSTANT FREQUENCY; A SECOND OSCILLATOR FOR PRODUCING A VARIABLE FREQUENCY HAVING AS A MEAN VALUE THAT OF SAID CONSTANT FREQUENCY; MEANS FOR PRODUCING A TRANSMISSION FREQUENCY IN PREDETERMINED RELATION WITH SAID CONSTANT FREQUENCY; MEANS FOR BEAMING SAID TRANSMISSION FREQUENCY AT A MOVING TARGET AND MEANS FOR RECEIVING REFLECTED ENERGY FROM THE TARGET WHICH REFLECTED ENERGY INCLUDES A DOPPLER COMPONENT PROPORTIONAL TO THE RADIAL VELOCITY OF THE TARGET; MEANS FOR PRODUCING A REFERENCE FREQUENCY; SERVO-LOOP MEANS INCLUDING MEANS FOR COMPARING THE FREQUENCY OF THE REFLECTED ENERGY WITH THE REFERENCE FREQUENCY WHEREBY TO PRODUCE AN ERROR SIGNAL AND MEANS FOR APPLYING SAID ERROR SIGNAL TO SAID SECOND OSCILLATOR TO VARY THE FREQUENCY THEREOF UNTIL SAID ERROR SIGNAL IS SUBSTANTIALLY ZERO; AND MIXER MEANS CONNECTED TO BOTH SAID FIRST AND SECOND OSCILLATORS FOR PRODUCING A DIFFERENTIAL OUTPUT SIGNAL FREQUENCY, WHEREBY SAID OUTPUT SIGNAL FREQUENCY IS A MEASURE OF SAID RADIAL VELOCITY REGARDLESS OF VARIATIONS IN SAID TRANSMISSION FREQUENCY.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-05-02 | 1969-11-01 | 1970-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-02 | 1973-11-01 | 1974-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-02 | 1977-11-01 | 1978-05-03 | $7700.00 | Window Closed / Lapsed |