Patent US4613865A successfully refreshed from Google Patents.
US4613865A
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US
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Radiation source identification system
Assignee: ITT Inc
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Filing: 1984-05-25
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Granted: 1986-09-23
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Expires: 2004-05-25
Abstract
Abstract A system for determining the direction of propagation of and the radio frequency of a source of electromagnetic energy. A frequency scanning compressive receiver detects the frequency of a radiating source at a high scanning rate. Resolution is thus not as good as desired. In this arrangement, a resolution receiver is combined to obtain sources of radiated energy of different frequencies that the compressive receiver cannot distinguish.
Inventors
- 👤 Leonard J. Hoffman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:54
CPC Classifications
H; H03; H03J; H03J7/00; H03J7/18; H03J7/32
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
184 words
A system for determining the frequency of and location of a radiating source of electromagnetic energy, said system comprising: receiving antenna means including a plurality of beam ports; an electronic stepping switch connected from said beam ports; a course frequency scanning compressive receiver having an input connected from said electronic stepping switch; first means to cause said compressive receiver to scan repeatedly over a predetermined frequency band; second means to operate said stepping switch to shift the input of said compressive receiver from one beam port to the next for each frequency scan thereof; third means to store beam location and frequency signals detected by said compressive receiver; a frequency scanning resolution receiver for repeatedly scanning a band of frequencies at a rate slower than the scanning rate of said compressive receiver; a second electronic switch connected from said beam ports to said resolution receiver; and means, responsive to said means to store, to program a search through said second switch and said resolution receiver at said slower frequency scan rate to increase resolution in the vicinity of sources discovered by said compressive receiver.
Claim 2
Independent Claim
184 words
A system for determining the frequency of and location of a radiating source of electromagnetic energy, said system comprising: receiving antenna means including a plurality of beam ports; an electronic stepping switch connected from said beam ports; a course frequency scanning compressive receiver having an input connected from said electronic stepping switch; first means to cause said compressive receiver to scan repeatedly over a predetermined frequency band; second means to operate said stepping switch to shift the input of said compressive receiver from one beam port to the next for each frequency scan thereof; third means to store beam location and frequency signals detected by said compressive receiver; a frequency scanning resolution receiver for repeatedly scanning a band of frequencies at a rate slower than the scanning rate of said compressive receiver; a second electronic switch connected from said beam ports to said resolution receiver; and means, responsive to said means to store, to program a search through said second switch and said resolution receiver at said slower frequency scan rate to increase resolution in the vicinity of sources discovered by said compressive receiver.
Claim 3
Dependent Claim
40 words
The invention as defined in claim 1, wherein a third electronic switch is connected from said beam ports, and a monitoring set-on receiver is connected from said third electronic switch to track signals of sources with identified frequencies and locations.
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) | 1989-09-22 | 1990-03-24 | 1990-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-22 | 1994-03-24 | 1994-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-22 | 1998-03-24 | 1998-09-23 | $7700.00 | Window Closed / Lapsed |