Patent US3706993A successfully refreshed from Google Patents.
US3706993A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Search system
Assignee: United States Department of the Navy
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Filing: 1964-03-09
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Granted: 1972-12-19
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Expires: 1984-03-09
Abstract
Abstract 2. A search system for detecting moving targets, in chaff, and including a transmitter for reflecting bursts of randomly phase coded, electromagnetic energy from a target, and a receiver, said receiver comprising A DELAY LINE HAVING A PLURALITY OF OUTPUT TAPS THEREON, MEANS FOR APPLYING SAID REFLECTED BURSTS TO SAID DELAY LINE, A PLURALITY OF PHASE SHIFTERS WHICH ARE PRESET IN ACCORDANCE WITH THE PHASE CODING OF SAID TRANSMITTER, EACH PHASE SHIFTING MEANS BEING CONNECTED TO A DIFFERENT OUTPUT TAP OF SAID DELAY LINE, SAID PLURALITY OF PHASE SHIFTERS REMOVING SAID PHASE CODING FROM SAID BURSTS AND PROVIDING A PURE Doppler signal output, and DISPLAY MEANS OPERABLY CONNECTED TO RECEIVE THE OUTPUT FROM EACH OF SAID PHASE SHIFTING MEANS FOR INDICATING THE Doppler shift introduced by the target to each pulse of said burst.
Inventors
- 👤 John H Kuck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:44
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/02; G01S13/50; G01S13/52; G01S13/522; G01S13/524; G01S13/53
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
83 words
A search system for detecting a moving target in the presence of chaff, comprising a receiver, a delay line connected to the receiver, a plurality of phase shifters connected to the delay line, a second group of phase shifters connected to each of the firstmentioned phase shifters, a summer connected to selected phase shifters of the second group, a threshold detector connected to the summer, a memory storage unit connected to the detector, and a read-out device connected to the memory storage unit.
Claim 2
Dependent Claim
83 words
A search system for detecting a moving target in the presence of chaff, comprising a receiver, a delay line connected to the receiver, a plurality of phase shifters connected to the delay line, a second group of phase shifters connected to each of the firstmentioned phase shifters, a summer connected to selected phase shifters of the second group, a threshold detector connected to the summer, a memory storage unit connected to the detector, and a read-out device connected to the memory storage unit.
Claim 3
Dependent Claim
83 words
A search system for detecting a moving target in the presence of chaff, comprising a receiver, a delay line connected to the receiver, a plurality of phase shifters connected to the delay line, a second group of phase shifters connected to each of the first-mentioned phase shifters, a summer connected to selected phase shifters of the second group, a threshold detector connected to the summer, a memory storage unit connected to the detector, and a read-out device connected to the memory storage unit.
Claim 4
Dependent Claim
83 words
A search system for detecting a moving target in the presence of chaff, comprising a receiver, a delay line connected to the receiver, a plurality of phase shifters connected to the delay line, a second group of phase shifters connected to each of the first-mentioned phase shifters, a summer connected to selected phase shifters of the second group, a threshold detector connected to the summer, a memory storage unit connected to the detector, and a read-out device connected to the memory storage unit.
Claim 5
Dependent Claim
90 words
The search system of claim 2, said receiver further including, a plurality of summing circuits, the number of summing circuits being equal to the number of Doppler frequency intervals over which the system is operative, means for connecting the output of each of said phase shifters to each of said summing circuits, and means for connecting the outputs of each summing circuit to said display means, whereby the Doppler shift of said burst due to the presence of a target may be detected over a range of Doppler frequency intervals.
Claim 6
Dependent Claim
45 words
The search system of claim 2, said receiver further including, a plurality of summing circuits equal in number to the number of Doppler frequency intervals within the operating range of said system, and means connecting the outputs of said summing circuits to said display means.
Claim 7
Dependent Claim
34 words
The search system of claim 4 in which said display means includes, a threshold detector, said detector securing the outputs of said summing circuits and selecting for display the output of maximum signal intensity.
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) | 1975-12-19 | 1976-06-19 | 1976-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-19 | 1980-06-19 | 1980-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-19 | 1984-06-19 | 1984-12-19 | $7700.00 | Window Closed / Lapsed |