US3671966A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiple target separator
Assignee: United States Department of the Navy
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Filing: 1970-08-27
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Granted: 1972-06-20
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Expires: 1990-08-27
Abstract
Abstract A system for separating and identifying multiple targets within a PPI positioned gate area on a Radar IFF display. The IFF target separator acts upon the IFF response times within the gate and separates the targets in range order regardless of the order of arrival times of the target responses. The targets on the PPI can thus be associated with their respective IFF code readouts.
Inventors
- 👤 Frederick R Fluhr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:48
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/74; G01S13/76; G01S13/78; G01S13/781
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
101 words
An IFF processing system for separation of multiple radar targets on a plan position indicator and associating each target with its IFF reply comprising: means for selecting a gated area on said plan position area; bistable means coupled to said selecting means, said selecting means setting said bistable means upon detection of a target within said gated area means; a follow and hold circuit coupled to said bistable means; means for driving said follow and hold circuits; whereby said bistable means transmits a pulse to said follow and hold circuit upon being set, thereby holding the range of said detected target.
Claim 2
Dependent Claim
101 words
An IFF processing system for separation of multiple radar targets on a plan position indicator and associating each target with its IFF reply comprising: means for selecting a gated area on said plan position area; bistable means coupled to said selecting means, said selecting means setting said bistable means upon detection of a target within said gated area means; a follow and hold circuit coupled to said bistable means; means for driving said follow and hold circuits; whereby said bistable means transmits a pulse to said follow and hold circuit upon being set, thereby holding the range of said detected target.
Claim 3
Dependent Claim
44 words
An IFF system as recited in claim 1, wherein: said driving means is a sweep generator developing a range sweep voltage at the pulse repetition frequency of the radar; and a sweep advance amplifier coupled to said sweep generator for advancing said gated area.
Claim 4
Dependent Claim
41 words
An IFF system as recited in claim 2, including: a plurality of bistable means; a plurality of follow and hold circuits coupled to said plurality of bistable means for storing the range of a plurality of targets within said gated area.
Claim 5
Dependent Claim
42 words
An IFF system as recited in claim 3, including comparator means coupled to said follow and hold circuits and said sweep advance amplifier for comparing two consecutive ranges, said comparator outputs inhibiting ensuing follow and hold circuits from storing the same range.
Claim 6
Dependent Claim
34 words
An IFF system as recited in claim 4, incluDing multivibrator means coupled to said comparator means for supplying a range gate signal to the IFF readout upon receiving a signal from said comparator means.
Claim 7
Dependent Claim
16 words
An IFF system as recited in claim 5, wherein: said selecting means is a light pencil.
Claim 8
Dependent Claim
22 words
An IFF system as recited in claim 6, including means for resetting said bistable means after said gated area period is ended.
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) | 1975-06-20 | 1975-12-20 | 1976-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-20 | 1979-12-20 | 1980-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-20 | 1983-12-20 | 1984-06-20 | $7700.00 | Window Closed / Lapsed |