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US3894293A
Expired / Lapsed
US
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Object locator system with automatic sensitivity reduction for large signals
Assignee: United States Department of the Navy
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Filing: 1963-01-29
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Granted: 1975-07-08
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Expires: 1983-01-29
Abstract
Abstract 2. In a velocity sensitive type radar system, A PLURALITY OF FREQUENCY SELECTIVE FILTERS FOR SEPARATING ON A BASIS OF FREQUENCY THE RADAR RETURN SIGNALS WHICH ARE SHIFTED IN FREQUENCY AS A RESULT OF MOTION OF OBJECTS PRODUCING THE RETURN SIGNALS, A PLURALITY OF VARIABLE GAIN SIGNAL TRANSMISSION MEANS, ONE FOR EACH FILTER AND EACH INDIVIDUALLY CONNECTED TO A FILTER, EACH TRANSMISSION MEANS INCLUDING A DIODE NETWORK WHICH IS CONDUCTIVE ONLY IN RESPONSE TO A SMALL AMPLITUDE OUTPUT SIGNAL FROM SAID CONNECTED FILTER, EACH TRANSMISSION MEANS FURTHER INCLUDING VARIABLE GAIN AMPLIFICATION MEANS FOR PROVIDING SAID TRANSMISSION MEANS OUTPUT SIGNAL AND CONTROLLED BY SAID DIODE NETWORK TO PROVIDE LARGE AMPLIFICATION OF THE OUTPUT SIGNAL FROM SAID CONNECTED FILTER WHEN SAID DIODE NETWORK IS CONDUCTIVE AND TO PROVIDE LESSER AMPLIFICATION OF THE OUTPUT SIGNAL FROM SAID CONNECTED FILTER WHEN SAID DIODE NETWORK IS NOT CONDUCTIVE AND MEANS FOR COMBINING THE OUTPUTS OF THE PLURALITY OF TRANSMISSION MEANS INTO A SINGLE OUTPUT CHANNEL FOR THE RADAR SYSTEM INDICATOR.
Inventors
- 👤 Garold K Jensen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:37
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/02; G01S13/50; G01S13/58; G01S13/64
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
184 words
In a velocity sensitive type radar system, a plurality of frequency selective filters for separating on a basis of frequency the radar return signals which are shifted in frequency as a result of motion of objects prodUcing the return signals, a plurality of means, one for each filter and each individually connected to a filter, for deriving individual control signals in dependency on the amplitude of the output signal of said connected filter, each of said means for deriving including a diode network which is conductive only in response to a small amplitude output signal from said connected filter, a plurality of variable gain amplifier means, one for each filter and each individually connected to a filter and responsive to the corresponding control signal to provide large amplification of the output signal from said connected filter when said diode network is conductive and to provide lesser amplification of the output signal from said connected filter when said diode network is not conductive and means for combining the outputs of the variable gain amplifier means into a single output channel for the radar system indicator.
Claim 2
Dependent Claim
184 words
In a velocity sensitive type radar system, a plurality of frequency selective filters for separating on a basis of frequency the radar return signals which are shifted in frequency as a result of motion of objects prodUcing the return signals, a plurality of means, one for each filter and each individually connected to a filter, for deriving individual control signals in dependency on the amplitude of the output signal of said connected filter, each of said means for deriving including a diode network which is conductive only in response to a small amplitude output signal from said connected filter, a plurality of variable gain amplifier means, one for each filter and each individually connected to a filter and responsive to the corresponding control signal to provide large amplification of the output signal from said connected filter when said diode network is conductive and to provide lesser amplification of the output signal from said connected filter when said diode network is not conductive and means for combining the outputs of the variable gain amplifier means into a single output channel for the radar system indicator.
Claim 3
Dependent Claim
164 words
In a velocity sensitive type radar system, a plurality of frequency selective filters for separating on a basis of frequency the radar return signals which are shifted in frequency as a result of motion of objects producing the return signals, a plurality of variable gain signal transmission means, one for each filter and each individually connected to a filter, each transmission means including a diode network which is conductive only in response to a small amplitude output signal from said connected filter, each transmission means further including variable gain amplification means for providing said transmission means output signal and controlled by said diode network to provide large amplification of the output signal from said connected filter when said diode network is conductive and to provide lesser amplification of the output signal from said connected filter when said diode network is not conductive and means for combining the outputs of the plurality of transmission means into a single output channel for the radar system indicator.
Claim 4
Dependent Claim
164 words
In a velocity sensitive type radar system, a plurality of frequency selective filters for separating on a basis of frequency the radar return signals which are shifted in frequency as a result of motion of objects producing the return signals, a plurality of variable gain signal transmission means, one for each filter and each individually connected to a filter, each transmission means including a diode network which is conductive only in response to a small amplitude output signal from said connected filter, each transmission means further including variable gain amplification means for providing said transmission means output signal and controlled by said diode network to provide large amplification of the output signal from said connected filter when said diode network is conductive and to provide lesser amplification of the output signal from said connected filter when said diode network is not conductive and means for combining the outputs of the plurality of transmission means into a single output channel for the radar system indicator.
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) | 1978-07-07 | 1979-01-06 | 1979-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-07 | 1983-01-06 | 1983-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-07 | 1987-01-06 | 1987-07-08 | $7700.00 | Window Closed / Lapsed |