US3761927A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rf phase detected interferometer radar
Assignee: RTX Corp
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Filing: 1972-03-20
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Granted: 1973-09-25
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Expires: 1992-03-20
Abstract
Abstract Two elements of a duplex interferometer antenna each feed respective ports of a cross coupling network, the output of which is applied to a quadrature hybrid used as an RF phase detector. The phase detector outputs are alternately sampled on a PRF basis, heterodyned to an intermediate frequency and processed through a signal logarithmic IF amplifier which is also sampled on an alternate basis, one of the alternate outputs being subtracted from the other to achieve a ratio.
Inventors
- 👤 S Amoroso
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:36
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/02; G01S13/06; G01S13/42; G01S13/44; G01S13/4454; G01S3/00; G01S3/02; G01S3/14; G01S3/46; G01S3/48
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
339 words
Radar signal receiving and processing apparatus providing RF phase detection of signals, adapted for use in an interferometer radar system of the type having a pair of radar wave receiving antennas spaced apart in a plane witin which the angle of incidence of a wave received at said antenna is to be detected, comprising: a quadrature having a pair of input ports adapted for interconnection with respective ones of the antennas of the radar system, and having a pair of output ports; means for intercoupling said input ports with said antennas; an RF switch having a pair of poles interconnected with said output ports, and having an output adapted to be switched between each of said poles; a local oscillator; a mixer responsive to the output of said RF switch and to said local oscillator for heterodyning signals from said switch to an intermediate frequency at an output thereof; a logarithmic amplifier connected to the output of said mixer; a pair of sample and hold circuits connected to the output of said logarithmic amplifier; means responsive to the voltage value held in said sample and hold circuits to provide a voltage which comprises the difference between the voltages held therein; and means adapted for connection with the transmitter of the radar system for cyclically operating said RF switch and activating said sample and hold circuits, in an alternative fashion, at the pulse repetition frequency of the radar, thereby to pass the signal from one output port of said quadrature hybrid through said mixer and said logarithmic amplifier to be sampled and held in one of said sample and hold circuits in response to one transmitted pulse, and to pass the signal from the other output of said quadrature hybrid through said mixer and said logarithmic amplifier to be sampled and held in the other of said sample and hold circuits in response to the next transmitted pulse, and thence from said first port through to tsaid first sample and hold circuit on the following transmitted pulse, and so forth.
Claim 2
Dependent Claim
339 words
Radar signal receiving and processing apparatus providing RF phase detection of signals, adapted for use in an interferometer radar system of the type having a pair of radar wave receiving antennas spaced apart in a plane witin which the angle of incidence of a wave received at said antenna is to be detected, comprising: a quadrature having a pair of input ports adapted for interconnection with respective ones of the antennas of the radar system, and having a pair of output ports; means for intercoupling said input ports with said antennas; an RF switch having a pair of poles interconnected with said output ports, and having an output adapted to be switched between each of said poles; a local oscillator; a mixer responsive to the output of said RF switch and to said local oscillator for heterodyning signals from said switch to an intermediate frequency at an output thereof; a logarithmic amplifier connected to the output of said mixer; a pair of sample and hold circuits connected to the output of said logarithmic amplifier; means responsive to the voltage value held in said sample and hold circuits to provide a voltage which comprises the difference between the voltages held therein; and means adapted for connection with the transmitter of the radar system for cyclically operating said RF switch and activating said sample and hold circuits, in an alternative fashion, at the pulse repetition frequency of the radar, thereby to pass the signal from one output port of said quadrature hybrid through said mixer and said logarithmic amplifier to be sampled and held in one of said sample and hold circuits in response to one transmitted pulse, and to pass the signal from the other output of said quadrature hybrid through said mixer and said logarithmic amplifier to be sampled and held in the other of said sample and hold circuits in response to the next transmitted pulse, and thence from said first port through to tsaid first sample and hold circuit on the following transmitted pulse, and so forth.
Claim 3
Dependent Claim
47 words
Radar signal receiving and processing apparatus according to claim 1 wherein said means for interconnecting said input ports with said antennas consists of means for compressing the relative phase angle between two signals respectively provided by said antennas to the respective input ports of said quadrature hybrid.
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) | 1976-09-24 | 1977-03-26 | 1977-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-24 | 1981-03-26 | 1981-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-24 | 1985-03-26 | 1985-09-25 | $7700.00 | Window Closed / Lapsed |