US4044356A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and device for correlation for use in a doppler radar installation
Assignee: Safran Aircraft Engines SAS
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Filing: 1975-09-22
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Granted: 1977-08-23
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Expires: 1995-09-22
Abstract
Abstract In a double correlation device incorporated in a radar installation for muring distance, the transmitted high-frequency signal is modulated, by frequency displacement, by a series of pseudo-random pulses. The first correlation is carried out between each pulse of the series and a delayed version of the series, the delay being chosen to correspond to the distance zone to be swept. The resulting signal undergoes a second correlation with the signal received after reflection from the target and controls a switch in order to deduce information on the distance investigated.
Inventors
- 👤 Jacques Fournier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:17
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/02; G01S13/06; G01S13/08; G01S13/32; G01S13/325; G01S13/10; G01S13/26; G01S13/28; G01S13/284
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
176 words
A doppler radar device for target measurements comprising the combination of: a pseudo-random digital pulse generator delivering a series of pulses alternatively representative of 1 and 0 binary states; an oscillator under the control of said pulse generator to alternatively deliver signals at two different frequencies for radar transmission purposes; a first multiplier having two inputs to which are applied respectively said series of pulses and a delayed version thereof imparted with a predetermined delay corresponding to the distance zone to be surveyed by radar, and an output; a second multiplier having two inputs to which are applied respectively said radar transmission signals and radar receiver echo signals, and an output; a switch connected to said second multiplier output and monitored by said first multiplier output; a 1 channel and a 0 channel each comprising a filter, under the control of said switch to be alternatively connected therethrough to said second multiplier output, depending on the monitoring of said switch by said first multiplier output; and means for extracting from said channels an operational radar signal.
Claim 2
Dependent Claim
176 words
A doppler radar device for target measurements comprising the combination of: a pseudo-random digital pulse generator delivering a series of pulses alternatively representative of 1 and 0 binary states; an oscillator under the control of said pulse generator to alternatively deliver signals at two different frequencies for radar transmission purposes; a first multiplier having two inputs to which are applied respectively said series of pulses and a delayed version thereof imparted with a predetermined delay corresponding to the distance zone to be surveyed by radar, and an output; a second multiplier having two inputs to which are applied respectively said radar transmission signals and radar receiver echo signals, and an output; a switch connected to said second multiplier output and monitored by said first multiplier output; a 1 channel and a 0 channel each comprising a filter, under the control of said switch to be alternatively connected therethrough to said second multiplier output, depending on the monitoring of said switch by said first multiplier output; and means for extracting from said channels an operational radar signal.
Claim 3
Dependent Claim
41 words
A device as claimed in claim 1, wherein said channels branch in parallel from said switch and each further includes a rectifier, and wherein said means for extracting includes a subtractor having two inputs respectively connected to each of said channels.
Claim 4
Dependent Claim
22 words
A device as claimed in claim 1, wherein said pseudo-random digital pulse generator includes a self-looped shift register operated by a clock.
References Cited (Backward Citations)
FR1572953A
Cited
GB1222242A
Cited
US3577144A
Cited
GB1380451A
Cited
US3889261A
Cited
US3906213A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-22 | 1981-02-21 | 1981-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-22 | 1985-02-21 | 1985-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-22 | 1989-02-21 | 1989-08-23 | $7700.00 | Window Closed / Lapsed |