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US3636562A
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High-range resolution radar target matched filter
Assignee: United States Department of the Navy
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Filing: 1970-02-24
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Granted: 1972-01-18
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Expires: 1990-02-24
Abstract
Abstract A radar target matched filter for improving target recognition and identification capabilities of high-range resolution radar systems. The filter comprises a microwave delay line having a plurality of adjustable energy coupling taps distributed along the delay line and set at selectively predetermined positions along the delay line corresponding to known scatter centers of a particular target. The tap outputs are combined such that the single dominant output which results will peak upon receiving reflected signals from targets for which the filter is matched.
Inventors
- 👤 Donald R Wehner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:11
CPC Classifications
G; G01; G01S; G01S7/00; G01S7/02; G01S7/41; G01S7/411
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
147 words
The method of identifying a remote target comprising the steps of: illuminating a target to be identified with RF pulses of microwave energy of predetermined bandwidth; receiving an echo signal from said target throughout a band of frequencies within said predetermined bandwidth; said echo signal consisting of a plurality of discrete RF pulses, each of said discrete RF pulses corresponding to the energy reflected from a scatter center of said target to be identified; channeling said echo signal along a number of different delay paths of a common microwave delay line, said number being equal to the number of said scatter centers; extracting said echo signal at the end of each of said delay paths; combining to obtain a time-correlated RF pulse having a maximum amplitude substantially equal to the algebraic sum of the maximum amplitudes of said plurality of discrete RF pulses in said echo signal.
Claim 2
Independent Claim
147 words
The method of identifying a remote target comprising the steps of: illuminating a target to be identified with RF pulses of microwave energy of predetermined bandwidth; receiving an echo signal from said target throughout a band of frequencies within said predetermined bandwidth; said echo signal consisting of a plurality of discrete RF pulses, each of said discrete RF pulses corresponding to the energy reflected from a scatter center of said target to be identified; channeling said echo signal along a number of different delay paths of a common microwave delay line, said number being equal to the number of said scatter centers; extracting said echo signal at the end of each of said delay paths; combining to obtain a time-correlated RF pulse having a maximum amplitude substantially equal to the algebraic sum of the maximum amplitudes of said plurality of discrete RF pulses in said echo signal.
Claim 3
Independent Claim
195 words
A system for identifying remote targets comprising: means for illuminating said target with RF pulses of microwave energy; means for receiving echo signal from said target; said echo signal consisting of a plurality of discrete time-displaced pulses, each of said pulses corresponding to the energy reflected from a scatter center of said target; a delay line coupled at one end thereof to the output of said receiver means and connected at the other end thereof to a terminating resistance to prevent standing or traveling waves along said delay line; means for channeling said echo signal along a different path on said delay line; said means including a plurality of selectively adjustable microwave energy coupling taps distributed along said delay line; the length of each of said paths being a function of the time delay required to enable the discrete time-displaced pulses to be superimposed upon each other in a time-correlated manner to provide a composite pulse having a maximum amplitude substantially equal to the algebraic sum of the amplitudes of said discrete, time-displaced pulses; means for combining the amplitudes of said discrete pulses to obtain said composite pulse; and, means for detecting said composite pulse.
Claim 4
Independent Claim
195 words
A system for identifying remote targets comprising: means for illuminating said target with RF pulses of microwave energy; means for receiving echo signal from said target; said echo signal consisting of a plurality of discrete time-displaced pulses, each of said pulses corresponding to the energy reflected from a scatter center of said target; a delay line coupled at one end thereof to the output of said receiver means and connected at the other end thereof to a terminating resistance to prevent standing or traveling waves along said delay line; means for channeling said echo signal along a different path on said delay line; said means including a plurality of selectively adjustable microwave energy coupling taps distributed along said delay line; the length of each of said paths being a function of the time delay required to enable the discrete time-displaced pulses to be superimposed upon each other in a time-correlated manner to provide a composite pulse having a maximum amplitude substantially equal to the algebraic sum of the amplitudes of said discrete, time-displaced pulses; means for combining the amplitudes of said discrete pulses to obtain said composite pulse; and, means for detecting said composite pulse.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-17 | 1975-07-19 | 1976-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-17 | 1979-07-19 | 1980-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-17 | 1983-07-19 | 1984-01-18 | $7700.00 | Window Closed / Lapsed |