Patent US1965774A successfully refreshed from Google Patents.
US3898653A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automotive radar sensor
Assignee: Mitsubishi Electric Corp
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Filing: 1973-02-20
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Granted: 1975-08-05
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Expires: 1993-02-20
Abstract
Abstract A mixer phase detects echo pulses from a target with transmission pulses each having a predetermined frequency and serving as a range gating signal to form a pulse train having a Doppler wave as its envelope. The pulse train is applied to a holding capacitor to provide the Doppler wave. A counter counts the Doppler waves to produce an output in response to its count exceeding a predetermined value. Alternatively after having expanded its pulses by a stray capacitance around the output of the mixer, the pulse train may be demodulated to the Doppler wave by a sample holding circuit controlled with sampling pulses synchronized with the transmission pulses.
Inventors
- 👤 Kazuhiro Ban
- 👤 Jiro Kojima
- 👤 Teruo Kondoh
- 👤 Yoshik Masuno
- 👤 Naoyuki Fukuhara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:57
CPC Classifications
G; G01; G01S; G01S7/00; G01S7/02; G01S7/023; G01S13/00; G01S13/88; G01S13/93; G01S13/931; G01S7/0231; G01S2013/9327; G01S2013/93271
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
198 words
A radar apparatus comprising, in combination, transmitter means for transmitting a train of transmission pulses each having a predetermined fixed frequency, transmitting antenna means for radiating the train of transmission pulses toward a target, receiving antenna means for picking up one echo pulse reflected from said target due to each of the transmission pulses hitting thereon, mixer means connected to said receiving antenna means, means for applying one portion of each transmission pulse from said transmitter means, as a reference pulse to said mixer means, said mixer means being operative to phase detect the echo pulses picked up by said receiving antenna means with the reference pulses to form a pulse train of the echo pulses only in the presence of the corresponding reference pulses servinG as a range gating signal, said pulse train having a Doppler wave as its envelope, a holding circuit for producing the Doppler wave from the pulse train outputted by said mixer means, Doppler wave amplifier means for amplifying the Doppler wave from said holding circuit, and a speed gating circuit responsive to a frequency output from said Doppler wave amplifier means in excess of a predetermined fixed magnitude to provide an output.
Claim 2
Dependent Claim
198 words
A radar apparatus comprising, in combination, transmitter means for transmitting a train of transmission pulses each having a predetermined fixed frequency, transmitting antenna means for radiating the train of transmission pulses toward a target, receiving antenna means for picking up one echo pulse reflected from said target due to each of the transmission pulses hitting thereon, mixer means connected to said receiving antenna means, means for applying one portion of each transmission pulse from said transmitter means, as a reference pulse to said mixer means, said mixer means being operative to phase detect the echo pulses picked up by said receiving antenna means with the reference pulses to form a pulse train of the echo pulses only in the presence of the corresponding reference pulses servinG as a range gating signal, said pulse train having a Doppler wave as its envelope, a holding circuit for producing the Doppler wave from the pulse train outputted by said mixer means, Doppler wave amplifier means for amplifying the Doppler wave from said holding circuit, and a speed gating circuit responsive to a frequency output from said Doppler wave amplifier means in excess of a predetermined fixed magnitude to provide an output.
Claim 3
Dependent Claim
49 words
A radar apparatus as claimed in claim 1, wherein said mixer means includes a detection diode and wherein said holding circuit includes a holding capacitor for holding the pulses of the pulse train from said mixer means and directly supplying the held pulses to said Doppler wave amplifier means.
Claim 4
Dependent Claim
60 words
A radar apparatus as claimed in claim 1, wherein said transmitting and receiving antenna means are disposed in spaced parallel relationship and wherein a transmitting unit is connected to said transmitting antenna means at one end and a receiving unit is connected to said receiving antenna means at that end remote from the one end of said transmitting antenna means.
Claim 5
Dependent Claim
32 words
A radar apparatus as claimed in claim 3, wherein said transmitting unit is integrally connected to said transmitting antenna means and said receiving unit is integrally connected to said receiving antenna means.
Claim 6
Dependent Claim
47 words
A radar apparatus comprising a pair of radar apparatus as defined in claim 3 disposed to render said transmitting and receiving antenna means of said pair of radar apparatus orthogonal to said transmitting and receiving antennas of the other radar apparatus to form a three dimensional coverage.
Claim 7
Dependent Claim
294 words
A radar apparatus comprising, in combination, transmitter means for transmitting a train of transmission pulses each having a predetermined fixed frequency, transmitting antenna means for radiating the train of transmission pulses toward a target, receiving antenna means for picking up one echo pulse reflected from said target due to each of transmitted pulses hitting thereupon, mixer means connected to said receiving antenna means, means for applying, one portion of each transmission pulse from said transmitter means, as a reference pulse to said mixer means, said mixer means being operative to phase detect the echo pulses picked up by said receiving antenna means with the reference pulses to form a pulse train of the echo pulses only in the presence of the corresponding reference pulses serving as a range gating signal, said pulse train having a Doppler wave as its envelope, a video amplifier, a pulse width stretching means connected between said mixer means and said video amplifier to stretch the pulses of the pulse train from said mixer means by means of a representation of stray capacitances coupled to the output and input respectively of said mixer and video amplifier means and to supply the stretched pulses to said video amplifier means, sample generator means for generating sampling pulses in synchronization with the transmission pulses from said transmitter means, a sampling and holding circuit connected to said sample generator means to hold the pulse train amplified by said video amplifier in accordance with the corresponding sampling pulses thereby to produce a Doppler wave, Doppler wave amplifier means for amplifying the Doppler wave from said sample holding circuit, and a speed gating circuit responsive to a frequency outputted from said Doppler wave amplifier means in excess of a predetermined fixed magnitude to provide an output.
Claim 8
Dependent Claim
294 words
A radar apparatus comprising, in combination, transmitter means for transmitting a train of transmission pulses each having a predetermined fixed frequency, transmitting antenna means for radiating the train of transmission pulses toward a target, receiving antenna means for picking up one echo pulse reflected from said target due to each of transmitted pulses hitting thereupon, mixer means connected to said receiving antenna means, means for applying, one portion of each transmission pulse from said transmitter means, as a reference pulse to said mixer means, said mixer means being operative to phase detect the echo pulses picked up by said receiving antenna means with the reference pulses to form a pulse train of the echo pulses only in the presence of the corresponding reference pulses serving as a range gating signal, said pulse train having a Doppler wave as its envelope, a video amplifier, a pulse width stretching means connected between said mixer means and said video amplifier to stretch the pulses of the pulse train from said mixer means by means of a representation of stray capacitances coupled to the output and input respectively of said mixer and video amplifier means and to supply the stretched pulses to said video amplifier means, sample generator means for generating sampling pulses in synchronization with the transmission pulses from said transmitter means, a sampling and holding circuit connected to said sample generator means to hold the pulse train amplified by said video amplifier in accordance with the corresponding sampling pulses thereby to produce a Doppler wave, Doppler wave amplifier means for amplifying the Doppler wave from said sample holding circuit, and a speed gating circuit responsive to a frequency outputted from said Doppler wave amplifier means in excess of a predetermined fixed magnitude to provide an output.
Claim 9
Dependent Claim
57 words
A radar apparatus as claimed in claim 6, wherein said transmitting and receiving antenna means are disposed in spaced parallel relationship and wherein a transmitting unit is connected to said transmitting antenna means and a receiving unit is connected to said receiving antenna means at that end remote from the one end of said transmitting antenna means.
Claim 10
Dependent Claim
32 words
A radar apparatus as claimed in claim 7, wherein said transmitting unit is integrally connected to said transmitting antenna means and said receiving unit is integrally connected to said receiving antenna means.
Claim 11
Dependent Claim
45 words
A radar apparatus comprising a pair of radar apparatus as defined in claim 7 disposed to render said transmitting and receiving antenna means of one of said pair of radar apparatus orthogonal to said transmitting and receiving antenna means to form a three dimensional coverage.
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) | 1978-08-04 | 1979-02-03 | 1979-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-04 | 1983-02-03 | 1983-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-04 | 1987-02-03 | 1987-08-05 | $7700.00 | Window Closed / Lapsed |