US3720468A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for a transmitter receiver unit which gives an indication when an object reflects radiation transmitted from the transmitter to the receiver
Assignee: Saab Bofors AB
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Filing: 1971-02-23
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Granted: 1973-03-13
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Expires: 1991-02-23
Abstract
Abstract Apparatus for indicating reflected radiation from a remote object comprises a transmitter for transmitting amplitudemodulated radiation and a receiver for receiving the amplitudemodulated radiation reflected from the remote object. The receiver includes first means for receiving the reflected radiation and converting it to first pulse signals and second means for receiving the amplitude-modulated radiation directly from the transmitter and converting it to second pulse signals. Means compare the first and second pulse signals for giving indications in accordance with the simultaneous phases of said first and second pulse signals.
Inventors
- 👤 L Skagerlund
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:29
CPC Classifications
G; G01; G01S; G01S7/00; G01S7/48; G01S7/483; G01S17/00; G01S17/02; G01S17/04; G01S17/06; G01S17/08; G01S17/10
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
99 words
A surveillance device for detecting the presence of a remote object by means of radiation reflected from such objects comprising transmitter means for transmitting pulses of radiation toward a remote object, means for generating reference pulses related to the transmitted pulses of radiation, means for generating information pulses related to pulses of radiation reflected from a remote object and possible noise signals, and means for receiving the reference pulses and the information pulses to give an indication of the presence of a remote object only when a particular polarity relationship exists between a reference pulse and an information pulse.
Claim 2
Dependent Claim
99 words
A surveillance device for detecting the presence of a remote object by means of radiation reflected from such objects comprising transmitter means for transmitting pulses of radiation toward a remote object, means for generating reference pulses related to the transmitted pulses of radiation, means for generating information pulses related to pulses of radiation reflected from a remote object and possible noise signals, and means for receiving the reference pulses and the information pulses to give an indication of the presence of a remote object only when a particular polarity relationship exists between a reference pulse and an information pulse.
Claim 3
Dependent Claim
99 words
A surveillance device for detecting the presence of a remote object by means of radiation reflected from such objects comprising transmitter means for transmitting pulses of radiation toward a remote object, means for generating reference pulses related to the transmitted pulses of radiation, means for generating information pulses related to pulses of radiation reflected from a remote object and possible noise signals, and means for receiving the reference pulses and the information pulses to give an indication of the presence of a remote object only when a particular polarity relationship exists between a reference pulse and an information pulse.
Claim 4
Dependent Claim
99 words
A surveillance device for detecting the presence of a remote object by means of radiation reflected from such objects comprising transmitter means for transmitting pulses of radiation toward a remote object, means for generating reference pulses related to the transmitted pulses of radiation, means for generating information pulses related to pulses of radiation reflected from a remote object and possible noise signals, and means for receiving the reference pulses and the information pulses to give an indication of the presence of a remote object only when a particular polarity relationship exists between a reference pulse and an information pulse.
Claim 5
Dependent Claim
192 words
In a surveillance device which includes a transmitter for transmitting radiation modulated at a predetermined frequency and which includes a detector which generates first electric signals in response to received radiation, a device for giving an indication when a remote object reflects to the receiver radiation transmitted by the transmitter comprising sensing means for generating second electric signals related to the transmitted radiation, amplifier means connected to the detector for converting the first electric signals to first pulses, pulse generator means connected to said sensing means for generating second and third pulses related to said second electric signals, a pulse signal comparator means connected to said pulse generator means and said amplifier means for comparing the polarities of the first and second pulses to give an indication pulse when a particular polarity relationship exists, and at least one pulse counter connected to said pulse generator and said pulse comparator means which is set to a count value upon receipt of a third pulse at a first input from said pulse comparator means and is cleared to zero upon receipt of an indication pulse at a second input from said pulse comparator means.
Claim 6
Dependent Claim
192 words
In a surveillance device which includes a transmitter for transmitting radiation modulated at a predetermined frequency and which includes a detector which generates first electric signals in response to received radiation, a device for giving an indication when a remote object reflects to the receiver radiation transmitted by the transmitter comprising sensing means for generating second electric signals related to the transmitted radiation, amplifier means connected to the detector for converting the first electric signals to first pulses, pulse generator means connected to said sensing means for generating second and third pulses related to said second electric signals, a pulse signal comparator means connected to said pulse generator means and said amplifier means for comparing the polarities of the first and second pulses to give an indication pulse when a particular polarity relationship exists, and at least one pulse counter connected to said pulse generator and said pulse comparator means which is set to a count value upon receipt of a third pulse at a first input from said pulse comparator means and is cleared to zero upon receipt of an indication pulse at a second input from said pulse comparator means.
Claim 7
Dependent Claim
15 words
The device according to claim 2 wherein said amplifier means is a saturated wide-band amplifier.
Claim 8
Dependent Claim
26 words
The device according to claim 2 further comprising another pulse counter connected between said pulse comparator means and the second input of said one pulse counter.
Claim 9
Dependent Claim
15 words
The device according to claim 3 wherein said amplifier means is a saturated wide-band amplifier.
Claim 10
Dependent Claim
37 words
The device according to claim 2 further comprising an AND-circuit having inputs connected to said pulse generator means and said pulse signal comparator means and an output connected to the second input of said one pulse counter.
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) | 1976-03-12 | 1976-09-11 | 1977-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-12 | 1980-09-11 | 1981-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-12 | 1984-09-11 | 1985-03-13 | $7700.00 | Window Closed / Lapsed |