Patent US2497986A successfully refreshed from Google Patents.
Patent US4603331A successfully refreshed from Google Patents.
US4603331A
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Radar target spectrum classifier
Assignee: United States Department of the Navy
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Filing: 1968-11-19
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Granted: 1986-07-29
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Expires: 1988-11-19
Abstract
Abstract A radar transmitter illuminates an unidentified remote radar target with pped or swept frequency pulses of microwave energy. The broad band of the frequencies of the reflected signal is received and divided into a large number of adjacent narrow-band segments. The amplitude of each segment is detected. The uniqueness of the set of amplitudes effectively "finger-prints" the target.
Inventors
- 👤 Donald R. Wehner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:02
CPC Classifications
G; G01; G01S; G01S7/00; G01S7/02; G01S7/41; G01S7/411; G01R; G01R23/00; G01R23/16; G01R23/165
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
107 words
The method of identifying remote objects comprising the steps of: illuminating the object to be identified with pulses of microwave energy of predetermined bandwidth; receiving reflected pulse energy from said object throughout a band of frequencies within said predetermined band; simultaneously subdividing the received band into a plurality of adjacent frequency segments and feeding said segments, respectively, to different circuits; simultaneously detecting the amplitude of each segment; identifying said object by the unique set of amplitude values occurring at the instant in time of the mentioned simultaneous detection; and comparing the received unique set of amplitude values with locally stored sets of amplitude values of known targets.
Claim 2
Independent Claim
107 words
The method of identifying remote objects comprising the steps of: illuminating the object to be identified with pulses of microwave energy of predetermined bandwidth; receiving reflected pulse energy from said object throughout a band of frequencies within said predetermined band; simultaneously subdividing the received band into a plurality of adjacent frequency segments and feeding said segments, respectively, to different circuits; simultaneously detecting the amplitude of each segment; identifying said object by the unique set of amplitude values occurring at the instant in time of the mentioned simultaneous detection; and comparing the received unique set of amplitude values with locally stored sets of amplitude values of known targets.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-07-28 | 1990-01-27 | 1990-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-28 | 1994-01-27 | 1994-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-28 | 1998-01-27 | 1998-07-29 | $7700.00 | Window Closed / Lapsed |