US4591859A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radar transmitter
Assignee: Raytheon Co
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Filing: 1982-09-20
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Granted: 1986-05-27
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Expires: 2002-09-20
Abstract
Abstract A radar transmitter is shown to include a voltage-controlled oscillator and associated amplifier to produce a signal to be transmitted with any noise generated within such oscillator and amplifier being reduced to a minimum by extracting a sample of the signal to be transmitted, downconverting such sample and then phase detecting the downconverted sample to derive a control signal for such oscillator.
Inventors
- 👤 Richard A. Campbell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 00:21
CPC Classifications
H; H03; H03L; H03L7/00; H03L7/06; H03L7/16
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
120 words
A radar transmitter comprising: (a) a voltage-controlled oscillator for generating a radio frequency signal having a frequency within a predetermined band of frequencies; (b) a bandpass amplifier, responsive to the radio frequency signal out of the voltage-controlled oscillator, for raising the power of such signal to a predetermined high level, such amplifier also generating a noise signal; (c) means for sampling and downconverting the radio frequency signal and noise signal out of the bandpass amplifier to provide a corresponding low frequency signal at a predetermined low level; and (d) a phase detector, responsive to the corresponding radio frequency signal at a low level and to a low frequency reference signal, for producing a frequency control signal for the voltage-controlled oscillator.
Claim 2
Dependent Claim
120 words
A radar transmitter comprising: (a) a voltage-controlled oscillator for generating a radio frequency signal having a frequency within a predetermined band of frequencies; (b) a bandpass amplifier, responsive to the radio frequency signal out of the voltage-controlled oscillator, for raising the power of such signal to a predetermined high level, such amplifier also generating a noise signal; (c) means for sampling and downconverting the radio frequency signal and noise signal out of the bandpass amplifier to provide a corresponding low frequency signal at a predetermined low level; and (d) a phase detector, responsive to the corresponding radio frequency signal at a low level and to a low frequency reference signal, for producing a frequency control signal for the voltage-controlled oscillator.
Claim 3
Dependent Claim
57 words
A radar transmitter as in claim 1 wherein the downconversion means includes a first frequency-agile oscillator and a mixer to produce a first intermediate frequency signal corresponding to the radio frequency signal and the noise signal out of the bandpass amplifier, the possible frequencies out of the first frequency-agile oscillator being within the bandwidth of the amplifier.
Claim 4
Dependent Claim
33 words
A radar transmitter as in claim 2 wherein the downconversion means includes a second fixed-frequency oscillator and a mixer to produce a second intermediate frequency signal corresponding to the first intermediate frequency signal.
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) | 1989-05-26 | 1989-11-25 | 1990-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-26 | 1993-11-25 | 1994-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-26 | 1997-11-25 | 1998-05-27 | $7700.00 | Window Closed / Lapsed |