US3939475A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of measuring range with large bistatic angle radar
Assignee: United States Department of the Navy
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Filing: 1974-10-11
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Granted: 1976-02-17
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Expires: 1994-10-11
Abstract
Abstract Measurement of the range of a detected target is accomplished through utiation of a large bistatic-angle radar system having two transmitters used in conjunction with a receiver indicating the duration of received target forward-scattered signals from each transmitter.
Inventors
- 👤 Bernard L. Lewis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:18
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/003
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
155 words
A large bistatic-angle radar system for determining the distance, R, of a target from a receiving means comprising: first and second transmitting means each adapted to transmit a radar signal of essentially the same frequency; said receiving means receiving and separately processing target forward-scattered signals from said first and second transmitting means, and for measuring the time durations T 1 and T 2 during which each said respective forward-scattered signal is received at a signal strength greater than a predetermined level below its maximum received signal strength; and, each said first and second transmitting means being spaced at a large bistatic-angle from said receiving means, said first transmitting means being spaced at a distance R 1 from said receiving means, and said second transmitting means being spaced at a distance R 2 from said receiving means wherein R 1 is greater than R 2 ; whereby the distance R is computed from the equation ##EQU12##
Claim 2
Dependent Claim
155 words
A large bistatic-angle radar system for determining the distance, R, of a target from a receiving means comprising: first and second transmitting means each adapted to transmit a radar signal of essentially the same frequency; said receiving means receiving and separately processing target forward-scattered signals from said first and second transmitting means, and for measuring the time durations T 1 and T 2 during which each said respective forward-scattered signal is received at a signal strength greater than a predetermined level below its maximum received signal strength; and, each said first and second transmitting means being spaced at a large bistatic-angle from said receiving means, said first transmitting means being spaced at a distance R 1 from said receiving means, and said second transmitting means being spaced at a distance R 2 from said receiving means wherein R 1 is greater than R 2 ; whereby the distance R is computed from the equation ##EQU12##
Claim 3
Dependent Claim
33 words
The large bistatic-angle radar system of claim 1, wherein all said means are arranged in a generally collinear fashion, said second transmitting means arranged between said first transmitting means and said receiving means.
Claim 4
Dependent Claim
19 words
The large bistatic-angle radar system of claim 2, wherein said bistatic-angle is in the range between 160° and 200°.
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) | 1979-02-16 | 1979-08-18 | 1980-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-16 | 1983-08-18 | 1984-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-16 | 1987-08-18 | 1988-02-17 | $7700.00 | Window Closed / Lapsed |