US4157545A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Correlation radar system
Assignee: International Telephone and Telegraph Corp
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Filing: 1970-12-24
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Granted: 1979-06-05
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Expires: 1990-12-24
Abstract
Abstract A correlation radar system utilizes a switching logic circuit for automatically switching a code word having a predetermined number of bits directly to a transmitter and through a delay to a receiver of the system and, alternately, directly to the receiver and through a delay to the transmitter. By utilizing the switching circuit, the delay need only produce up to one-half the number of bits in the code word.
Inventors
- 👤 Francis J. O'Farrell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:53
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/02; G01S13/06; G01S13/08; G01S13/10; G01S13/30
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
71 words
A correlation radar system having a transmitter circuit and a receiver circuit; means for producing a code word of L bits in length at a predetermined frequency; a delay network; and switching means for coupling said code word directly to said transmitter circuit and through said delay network to said receiver circuit, and alternately coupling said code directly to said receiver circuit and through said delay network to said transmitter circuit.
Claim 2
Dependent Claim
71 words
A correlation radar system having a transmitter circuit and a receiver circuit; means for producing a code word of L bits in length at a predetermined frequency; a delay network; and switching means for coupling said code word directly to said transmitter circuit and through said delay network to said receiver circuit, and alternately coupling said code directly to said receiver circuit and through said delay network to said transmitter circuit.
Claim 3
Dependent Claim
34 words
A system in accordance with claim 1 wherein said delay network can produce a delay of up to one-half the number of bits in said code in steps of one bit at a time.
Claim 4
Dependent Claim
29 words
A system in accordance with claim 1 wherein said entire code can be searched with said delay producing up to one-half the number of bits of said code word.
Claim 5
Dependent Claim
33 words
A system in accordance with claim 3 wherein said code is delayed by said delay network one bit at a time for up to one-half the number of bits of said code word.
Claim 6
Dependent Claim
34 words
A system in accordance with claim 1 wherein said entire code can be searched with said delay being continuously variable for an amount equal to one-half the number of bits of said code word.
References Cited (Backward Citations)
US3480956A
Cited
US3680101A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-06-04 | 1982-12-04 | 1983-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-06-04 | 1986-12-04 | 1987-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-06-04 | 1990-12-04 | 1991-06-05 | $7700.00 | Window Closed / Lapsed |