US3754253A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus and process for triggering the camera of a doppler speed-measuring apparatus
Assignee: Zellweger Uster AG
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Filing: 1969-02-24
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Granted: 1973-08-21
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Expires: 1989-02-24
Abstract
Abstract The triggering of the camera depends on the chronological behavior of the Doppler frequency. The difference indicator supplies a signal from a comparison of the measured Doppler voltage value with a stored value and the measured time indicator measures the time it takes a vehicle to cover a fixed distance and produces a responsive signal. The evaluator produces a signal from these latter signals to either block triggering of the camera or actuate triggering after a set time delay.
Inventors
- 👤 R Balsiger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:06
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/88; G01S13/91; G01S13/92; G08; G08G; G08G1/00; G08G1/01; G08G1/052; G08G1/054
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
201 words
An apparatus for triggering a camera of a Doppler radar speed-measuring apparatus for vehicles comprising: a difference indicator connected to the speed measuring apparatus and camera for receiving a voltage proportional to the Doppler frequency from the speed measuring apparatus in response to the detection of a vehicle in a radar zone of the speed measuring apparatus, said difference indicator having means for evaluating changes in said voltage in relation to a particular tolerance range to produce a difference indication upon said voltage exceeding or falling below said range; a measured time indicator for measuring the time for the detected vehicle to pass through a set distance in response to the detection of the vehicle in the radar zone and for emitting a pulse corresponding to said time; and an evaluator connected to said difference indicator and said measured time indicator for receiving said difference indication and said pulse, said evaluator being connected to the camera for emitting a camera triggering signal to said camera in response to an occurrence of said difference indication after expiration of said pulse, said evaluator having means for blocking emission of said camera triggering signal during emission of said pulse from said measured time indicator.
Claim 2
Independent Claim
201 words
An apparatus for triggering a camera of a Doppler radar speed-measuring apparatus for vehicles comprising: a difference indicator connected to the speed measuring apparatus and camera for receiving a voltage proportional to the Doppler frequency from the speed measuring apparatus in response to the detection of a vehicle in a radar zone of the speed measuring apparatus, said difference indicator having means for evaluating changes in said voltage in relation to a particular tolerance range to produce a difference indication upon said voltage exceeding or falling below said range; a measured time indicator for measuring the time for the detected vehicle to pass through a set distance in response to the detection of the vehicle in the radar zone and for emitting a pulse corresponding to said time; and an evaluator connected to said difference indicator and said measured time indicator for receiving said difference indication and said pulse, said evaluator being connected to the camera for emitting a camera triggering signal to said camera in response to an occurrence of said difference indication after expiration of said pulse, said evaluator having means for blocking emission of said camera triggering signal during emission of said pulse from said measured time indicator.
Claim 3
Independent Claim
179 words
An apparatus for triggering a camera of a Doppler radar speed-measuring apparatus for vehicles comprising: an entry indicator connected to the speed measuring apparatus to emit a signal upon entry of a vehicle into the radar zone; a storer connected to the speed measuring apparatus for temporarily storing a measured value voltage dependent on the Doppler frequency in response to a period of relatively undisturbed reflection conditions; a difference indicator connected to the speed measuring apparatus for receiving a first voltage proportional to the Doppler frequency from the speed measuring apparatus in response to the detection of a vehicle in the radar zone of the speed measuring apparatus, said difference indicator being connected to said storer for receiving said measured value voltage and having means for evaluating changes in said first voltage in relation to a particular tolerance range of said measured value voltage to produce a difference indication upon said first voltage exceeding said range, and said difference indicator being connected to the camera for blocking triggering of the camera in response to occurrence of said difference indicator.
Claim 4
Independent Claim
179 words
An apparatus for triggering a camera of a Doppler radar speed-measuring apparatus for vehicles comprising: an entry indicator connected to the speed measuring apparatus to emit a signal upon entry of a vehicle into the radar zone; a storer connected to the speed measuring apparatus for temporarily storing a measured value voltage dependent on the Doppler frequency in response to a period of relatively undisturbed reflection conditions; a difference indicator connected to the speed measuring apparatus for receiving a first voltage proportional to the Doppler frequency from the speed measuring apparatus in response to the detection of a vehicle in the radar zone of the speed measuring apparatus, said difference indicator being connected to said storer for receiving said measured value voltage and having means for evaluating changes in said first voltage in relation to a particular tolerance range of said measured value voltage to produce a difference indication upon said first voltage exceeding said range, and said difference indicator being connected to the camera for blocking triggering of the camera in response to occurrence of said difference indicator.
Claim 5
Dependent Claim
88 words
An apparatus as set forth in claim 2 wherein said difference indicator includes a difference amplifier for receiving said first voltage and said stored value voltage to produce a current proportional to the differences between said voltages, and a limiter connected to said difference amplifier and said storer and having an operating level variable as a function of the measured speed of the vehicle in the radar zone for establishing said tolerance range about said measured value voltage to emit a pulse upon said current exceeding said range.
Claim 6
Dependent Claim
43 words
An apparatus as set forth in claim 3 wherein said difference indicator further includes an integration stage connected to said limiter and said storer for integrating said pulse from said limiter with respect to said measured value voltage to produce the difference indication.
Claim 7
Dependent Claim
50 words
An apparatus as set forth in claim 2 further comprising a measured time indicator connected to said storer and said entry indicator for measuring the time for the vehicle to pass through a set distance in response to said voltages in order to emit a logical signal in response thereto.
Claim 8
Dependent Claim
68 words
An apparatus as set forth in claim 5 wherein said time indicator includes a controllable switching element connected to said storer to receive said measured value voltage and a monostable circuit having a condensor connected to said switching element and having a tilting time variable in response to a speed-proportional Current of said condensor to produce said logical signal in response to said signal from said entry indicator.
Claim 9
Dependent Claim
87 words
An apparatus as set forth in claim 5 further comprising a bistable switching device connected to said entry indicator and said difference indicator to receive said signal and said difference indication therefrom and an evaluator connected to said switching device and said time indicator to receive said difference indication and said logical signal therefrom for producing a triggering signal in response to a difference indication occurring after said logical signal, said evaluator being connected to the camera to trigger the camera upon production of said triggering signal.
Claim 10
Dependent Claim
50 words
An apparatus as set forth in claim 7 wherein said bistable switching device is responsive to said signal of said entry indicator to move into one of two positions and is responsive to a subsequent difference indication from said difference indicator to move into the other of said two positions.
Claim 11
Dependent Claim
121 words
A process for triggering the camera of a Doppler radar speed measuring apparatus comprising the steps of determining the entry of a vehicle into the radar zone of the apparatus, determining the speed of the vehicle a length of time after entry into the radar zone, determining the time the vehicle takes to travel a predetermined distance in the radar zone, determining a change in the Doppler frequency of a Doppler signal in excess of a particular tolerance range related to the measured Doppler frequency during the time the vehicle travels said predetermined distance to produce a difference indication signal in response thereto, and blocking the triggering of the camera in response to said difference indication signal occurring during said time.
Claim 12
Dependent Claim
121 words
A process for triggering the camera of a Doppler radar speed measuring apparatus comprising the steps of determining the entry of a vehicle into the radar zone of the apparatus, determining the speed of the vehicle a length of time after entry into the radar zone, determining the time the vehicle takes to travel a predetermined distance in the radar zone, determining a change in the Doppler frequency of a Doppler signal in excess of a particular tolerance range related to the measured Doppler frequency during the time the vehicle travels said predetermined distance to produce a difference indication signal in response thereto, and blocking the triggering of the camera in response to said difference indication signal occurring during said time.
Claim 13
Dependent Claim
140 words
A process for triggering the camera of a Doppler radar speed measuring apparatus comprising the steps of determining the entry of a vehicle into the radar zone of the apparatus, determining the speed of the vehicle a length of time after entry into the radar zone, determining the time the vehicle takes to travel a predetermined distance in the radar zone, determining a change in the Doppler frequency of a Doppler signal in excess of a particular tolerance range related to the measured Doppler frequency during the time the vehicle travels said predetermined distance to produce a difference indication signal in response thereto, triggering the camera after expiration of said time in response to said signal occurring after said time while blocking triggering of the camera during said time in response to said difference indication signal occurring during said time.
Claim 14
Dependent Claim
140 words
A process for triggering the camera of a Doppler radar speed measuring apparatus comprising the steps of determining the entry of a vehicle into the radar zone of the apparatus, determining the speed of the vehicle a length of time after entry into the radar zone, determining the time the vehicle takes to travel a predetermined distance in the radar zone, determining a change in the Doppler frequency of a Doppler signal in excess of a particular tolerance range related to the measured Doppler frequency during the time the vehicle travels said predetermined distance to produce a difference indication signal in response thereto, triggering the camera after expiration of said time in response to said signal occurring after said time while blocking triggering of the camera during said time in response to said difference indication signal occurring during said time.
Claim 15
Dependent Claim
20 words
A process as set forth in claim 10 wherein said range is established by a percentage of the measured speed.
Claim 16
Dependent Claim
28 words
A process as set forth in claim 10 wherein said changes in Doppler frequency are evaluated with respect to chronological behavior thereof prior to triggering of the camera.
Claim 17
Dependent Claim
41 words
A process as set forth in claim 10 wherein said changes are evaluated with respect to chronological behavior thereof and as a function of a measured value dependent on the measured speed of a vehicle prior to triggering of the camera.
Claim 18
Dependent Claim
54 words
A process as set forth in claim 10 wherein said step of determining the speed of the vehicle includes the storing of a measured value corresponding to the measured speed, said process further comprising the step of cancelling the stored measured value in response to said difference signal indication signal occurring during said time.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-20 | 1977-02-19 | 1977-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-20 | 1981-02-19 | 1981-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-20 | 1985-02-19 | 1985-08-21 | $7700.00 | Window Closed / Lapsed |