US3617993A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cw doppler transceiver system
Assignee: F Hoffmann La Roche AG
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Filing: 1969-09-10
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Granted: 1971-11-02
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Expires: 1989-09-10
Abstract
Abstract A transceiver system for processing a Doppler signal, utilizing a common transmit-receive transducer driven by a high-frequency RF-square wave amplitude limited signal for eliminating AM transmitter noise, and a receiver for amplitude-demodulating the received RF output of the transducer to provide a Doppler frequency output.
Inventors
- 👤 Harold Lee Massie
- 👤 Bruce Elson Mount
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:23
CPC Classifications
G; G01; G01S; G01S15/00; G01S15/02; G01S15/50; G01S15/58; G01S15/586; A; A61; A61B; A61B8/00; A61B8/48; A61B8/488
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
99 words
A transceiver system for processing a Doppler signal comprising, common transducer means for directing energy to and receiving energy reflected from a moving surface, transmitter means for driving said transducer means with a high frequency RF square wave amplitude limited signal for eliminating AM transmitter noise, receiver means coupled from said transducer means for amplitudedemodulating signals representative of said reflected energy to provide a Doppler frequency output, and means for providing a high transmitter output impedance as compared with the impedance at said transducer means enabling maximum transfer of reflected energy from said transducer means to said receiver means.
Claim 2
Dependent Claim
99 words
A transceiver system for processing a Doppler signal comprising, common transducer means for directing energy to and receiving energy reflected from a moving surface, transmitter means for driving said transducer means with a high frequency RF square wave amplitude limited signal for eliminating AM transmitter noise, receiver means coupled from said transducer means for amplitudedemodulating signals representative of said reflected energy to provide a Doppler frequency output, and means for providing a high transmitter output impedance as compared with the impedance at said transducer means enabling maximum transfer of reflected energy from said transducer means to said receiver means.
Claim 3
Dependent Claim
105 words
A transceiver system for processing a Doppler signal comprising, common transducer means for directing energy to and receiving energy reflected from a moving surface, transmitter means for driving said transducer means with a high frequency RF square wave amplitude-limited signal for eliminating Am transmitter noise, receiver means coupled from said transducer means for amplitude-demodulating signals representative of said reflected energy to provide a Doppler frequency output, said transmitter means including means for generating a high frequency RF sinusoidal waveform, and squaring amplifier means connected from said generator means for detecting the zero crossings of said sinusoidal wave to provide said high frequency RF square wave.
Claim 4
Dependent Claim
105 words
A transceiver system for processing a Doppler signal comprising, common transducer means for directing energy to and receiving energy reflected from a moving surface, transmitter means for driving said transducer means with a high frequency RF square wave amplitude-limited signal for eliminating Am transmitter noise, receiver means coupled from said transducer means for amplitude-demodulating signals representative of said reflected energy to provide a Doppler frequency output, said transmitter means including means for generating a high frequency RF sinusoidal waveform, and squaring amplifier means connected from said generator means for detecting the zero crossings of said sinusoidal wave to provide said high frequency RF square wave.
Claim 5
Dependent Claim
30 words
Apparatus according to claim 2 wherein said transmitter means further includes a saturable switching amplifier means connected from said squaring amplifier means for amplitude-limiting said high frequency RF square wave.
Claim 6
Dependent Claim
17 words
Apparatus according to claim 3 including transformer means for coupling said transmitter means to said transducer means.
Claim 7
Dependent Claim
41 words
Apparatus according to claim 2 wherein, said receiver means includes a dual-channel detector coupled to the transducer means, having oppositely poled diodes in parallel paths and coupled to difference means for eliminating AM noise caused by asymmetrical waveforms at the transmitter.
Claim 8
Dependent Claim
88 words
A transceiver system for processing a Doppler signal comprising, common transducer means for directing energy to and receiving energy reflected from a moving surface, transmitter means for driving said transducer means with a high frequency RF square wave amplitude limited signal for eliminating AM transmitter noise, and receiver means coupled from said transducer means for amplitude demodulating signals representative of said reflected energy to provide a Doppler frequency output, said receiver means including means for differentiating said amplitude-demodulated signals to provide an output representative of the surface velocity.
Claim 9
Dependent Claim
88 words
A transceiver system for processing a Doppler signal comprising, common transducer means for directing energy to and receiving energy reflected from a moving surface, transmitter means for driving said transducer means with a high frequency RF square wave amplitude limited signal for eliminating AM transmitter noise, and receiver means coupled from said transducer means for amplitude demodulating signals representative of said reflected energy to provide a Doppler frequency output, said receiver means including means for differentiating said amplitude-demodulated signals to provide an output representative of the surface velocity.
Claim 10
Dependent Claim
23 words
Apparatus according to claim 6 wherein said receiver means includes envelope detector means coupled to said differentiating means, for performing said amplitude demodulating.
Claim 11
Independent Claim
89 words
A method for processing a Doppler signal resulting from a frequency shift of a carrier signal by reflection from a moving surface comprising the steps of: driving a common transmit-receive transducer with a high frequency RF square wave amplitude limited signal-minimizing AM-transmitting noise, amplitude-demodulating the reflected energy received by the common transducer to provide a Doppler frequency output, and presenting a high output impedance at the driving stage output, as compared with the transducer impedance to maximize the reflected energy signal transfer from the transducer to be amplitude demodulated.
Claim 12
Independent Claim
89 words
A method for processing a Doppler signal resulting from a frequency shift of a carrier signal by reflection from a moving surface comprising the steps of: driving a common transmit-receive transducer with a high frequency RF square wave amplitude limited signal-minimizing AM-transmitting noise, amplitude-demodulating the reflected energy received by the common transducer to provide a Doppler frequency output, and presenting a high output impedance at the driving stage output, as compared with the transducer impedance to maximize the reflected energy signal transfer from the transducer to be amplitude demodulated.
Claim 13
Dependent Claim
24 words
A method according to claim 8 including the step of differentiating the amplitude modulated signal to provide an output representative of the surface velocity.
Claim 14
Dependent Claim
103 words
A transceiver system for processing a Doppler signal comprising, common transducer means for directing energy to and receiving energy reflected from a moving surface transmitter means for driving said transducer means with a high frequency RF square wAve amplitude limited signal for eliminating AM transmitter noise, and receiver means coupled from said transducer means for amplitude-demodulating signals representative of said reflected energy to provide a Doppler frequency output, said receiver means including a dual-channel detector coupled to the transducer means, having oppositely poled diodes in parallel paths and coupled to difference means for eliminating AM noise caused by asymmetrical waveforms at the transmitter.
Claim 15
Dependent Claim
103 words
A transceiver system for processing a Doppler signal comprising, common transducer means for directing energy to and receiving energy reflected from a moving surface transmitter means for driving said transducer means with a high frequency RF square wAve amplitude limited signal for eliminating AM transmitter noise, and receiver means coupled from said transducer means for amplitude-demodulating signals representative of said reflected energy to provide a Doppler frequency output, said receiver means including a dual-channel detector coupled to the transducer means, having oppositely poled diodes in parallel paths and coupled to difference means for eliminating AM noise caused by asymmetrical waveforms at the transmitter.
References Cited (Backward Citations)
US3121856A
Cited
US3498290A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-01 | 1975-05-03 | 1975-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-01 | 1979-05-03 | 1979-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-01 | 1983-05-03 | 1983-11-02 | $7700.00 | Window Closed / Lapsed |