Patent US3371985A successfully refreshed from Google Patents.
Patent US3599208A successfully refreshed from Google Patents.
US3599208A
Expired / Lapsed
US
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Radar system
Assignee: United States Department of the Navy
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Filing: 1969-04-25
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Granted: 1971-08-10
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Expires: 1989-04-25
Abstract
Abstract The invention relates to a radar system for enhancing the reception of desired echoes by the elimination of background clutter. The system comprises a monopulse radar system provided with a quadrature error detector wherein the magnitude of the quadrature error signal is used to control the gain or sensitivity of the monopulse receiver.
Inventors
- 👤 Robert P Nelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:14
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/02; G01S13/06; G01S13/42; G01S13/44; G01S13/4445; G01S7/00; G01S7/02; G01S7/41; G01S7/414
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
103 words
A radar system for enhancing the reception of desired echoes comprising input means for receiving both desired and undesired signals; a microwave comparator coupled to the input means for establishing sum and difference signals; a sum signal receiver connected to the comparator for amplifying the sum signal; a difference signal receiver connected to the comparator for amplifying the difference signals; a sum signal detector coupled to the sum signal receiver; a quadrature difference phase detector connected to the sum signal receiver and to the difference receiver; and a gate circuit coupled to the quadrature difference phase detector and to the sum signal detector.
Claim 2
Dependent Claim
103 words
A radar system for enhancing the reception of desired echoes comprising input means for receiving both desired and undesired signals; a microwave comparator coupled to the input means for establishing sum and difference signals; a sum signal receiver connected to the comparator for amplifying the sum signal; a difference signal receiver connected to the comparator for amplifying the difference signals; a sum signal detector coupled to the sum signal receiver; a quadrature difference phase detector connected to the sum signal receiver and to the difference receiver; and a gate circuit coupled to the quadrature difference phase detector and to the sum signal detector.
Claim 3
Dependent Claim
23 words
The system of claim 1 wherein the sum signal receiver and the difference signal receiver contain mixer, preamp, variable attenuator and IF circuits.
Claim 4
Dependent Claim
23 words
The system of claim 2 further including a feedback circuit from the quadrature difference phase detector to both variable attenuators in both receivers.
Claim 5
Dependent Claim
34 words
The system of claim 3 further including a quadrature difference gate generator connected to the quadrature difference phase detector and the gate circuit to control the operation of the operation of the gate circuit.
Claim 6
Dependent Claim
35 words
The system of claim 4 further including a quadrature difference threshold coupled between the quadrature difference phase detector and the gate generator for setting the operating point of the generator and therefore the gate circuit.
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) | 1974-08-09 | 1975-02-08 | 1975-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-09 | 1979-02-08 | 1979-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-09 | 1983-02-08 | 1983-08-10 | $7700.00 | Window Closed / Lapsed |