US3718927A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic digital error detector for radar range tracking
Assignee: United States Department of the Navy
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Filing: 1971-04-23
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Granted: 1973-02-27
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Expires: 1991-04-23
Abstract
Abstract This invention pertains to a new method of obtaining range, AGC and angle tracking error voltages employing digital methods of processing the receiver output of high range resolution monopulse tracking radars to generate these signals.
Inventors
- 👤 D Howard
- 👤 D Cross
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:31
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/66
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
170 words
A radar tracking system which employs digital processing techniques in target tracking: antenna means functioning to provide, first, second and third signals; said first signal being indicative of target range; said second signal being indicative of target azimuth angular error from the boresight of said antenna; said third signal being indicative of target elevation angular error from the boresight of said antenna; means for digitizing the analog information of said first, second and third signals and for forming first, second and third digital arrays representative of said first, second and third signals, respectively; all said digital arrays having a length greater than 2; a first digital array which is representative of said first signal having a length n which is an even number; means for dividing said first digital array onto two equal halves; means for individually summing said two equal halves separately; means for deriving a first error signal which is representative of the difference between the sums of said two equal halves; thereby forming a range error signal.
Claim 2
Dependent Claim
170 words
A radar tracking system which employs digital processing techniques in target tracking: antenna means functioning to provide, first, second and third signals; said first signal being indicative of target range; said second signal being indicative of target azimuth angular error from the boresight of said antenna; said third signal being indicative of target elevation angular error from the boresight of said antenna; means for digitizing the analog information of said first, second and third signals and for forming first, second and third digital arrays representative of said first, second and third signals, respectively; all said digital arrays having a length greater than 2; a first digital array which is representative of said first signal having a length n which is an even number; means for dividing said first digital array onto two equal halves; means for individually summing said two equal halves separately; means for deriving a first error signal which is representative of the difference between the sums of said two equal halves; thereby forming a range error signal.
Claim 3
Dependent Claim
31 words
The radar tracking system of claim 1 wherein said second digital array, which is representative of said second signal, is summed thereby forming an azimuth error signal to control said antenna.
Claim 4
Dependent Claim
31 words
The radar tracking system of claim 1 wherein said third digital array, which is representative of said third signal, is summed thereby forming an elevation error signal to control said antenna.
Claim 5
Dependent Claim
33 words
The radar tracking system of claim 1 wherein the two equal halves of said first digital array are summed thereby forming an AGC signal proportional to the average amplitude of said first signal.
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) | 1976-02-27 | 1976-08-28 | 1977-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-27 | 1980-08-28 | 1981-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-27 | 1984-08-28 | 1985-02-27 | $7700.00 | Window Closed / Lapsed |