System and Method For Speed Measurement Verification
First Claim
1. A system for speed measurement verification, which system includesmeasuring means configured to automatically measure the speed of a vehicle travelling on a surface which includes a fixed marker at a predetermined distance from a point where the speed of the vehicle is measured;
- a camera for directing at said marker, in use; and
a processor arranged in electronic communication with the measuring means and camera, which processor is configured to automatically compare the measured speed of the vehicle to a predetermined speed limit and, if the measured speed exceeds such a speed limit, to automatically calculate a time delay according to the measured speed and the predetermined distance so as to predict when the vehicle, if travelling at the measured speed, will reach the marker, the processor being further configured to activate the camera after expiration of said time delay so that, if the measured speed is accurate, the vehicle will be proximate the marker so that an image captured when the camera is activated by the processor will show the vehicle relative to the marker in order to verify the accuracy of the measured speed;
wherein the measuring means includes an electromagnetic wave transmitter configured to automatically and sequentially transmit at least two pulsed electromagnetic waves having known velocities to the vehicle, and a receiver configured for automatically receiving the transmitted electromagnetic waves reflected from the vehicle, so that the processor is able to calculate the speed according to the flight time of the waves which have known velocities; and
wherein the measuring means is configured to measure the distance of the vehicle to the measuring means to determine the distance of the point where the speed of the vehicle is measured to the marker.
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Accused Products
Abstract
This invention provides for a system 20 for speed measurement verification. The system 20 includes measuring means configured to automatically measure the speed of a vehicle 32 travelling on a surface 36 which includes a marker 34 at a predetermined distance 40 from the measuring means. The system 20 also includes a camera 28 directed, in use, at the marker 34 and a processor 26 arranged in electronic communication with the measuring means and the camera 28. The processor 26 is configured to automatically compare the measured speed of the vehicle 32 to a predetermined speed limit, and to automatically calculate a time delay to activate the camera 28 if the measured speed exceeds the speed limit. The time delay is calculated according to the measured speed of the vehicle 32 from the instance when the speed measurement was made, so that the camera 28 is activated when the vehicle 32, if travelling at the measured speed, reaches the marker 34. The camera is then activated to capture 18 an image after expiration of the time delay so that, if the measured speed is accurate, the vehicle 32 will be positioned proximate the marker 34. This captured image then shows the vehicle 32 relative to the marker 34 which image is then able to serve as verification of the accuracy of the measured speed.
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Citations
23 Claims
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1. A system for speed measurement verification, which system includes
measuring means configured to automatically measure the speed of a vehicle travelling on a surface which includes a fixed marker at a predetermined distance from a point where the speed of the vehicle is measured; -
a camera for directing at said marker, in use; and a processor arranged in electronic communication with the measuring means and camera, which processor is configured to automatically compare the measured speed of the vehicle to a predetermined speed limit and, if the measured speed exceeds such a speed limit, to automatically calculate a time delay according to the measured speed and the predetermined distance so as to predict when the vehicle, if travelling at the measured speed, will reach the marker, the processor being further configured to activate the camera after expiration of said time delay so that, if the measured speed is accurate, the vehicle will be proximate the marker so that an image captured when the camera is activated by the processor will show the vehicle relative to the marker in order to verify the accuracy of the measured speed; wherein the measuring means includes an electromagnetic wave transmitter configured to automatically and sequentially transmit at least two pulsed electromagnetic waves having known velocities to the vehicle, and a receiver configured for automatically receiving the transmitted electromagnetic waves reflected from the vehicle, so that the processor is able to calculate the speed according to the flight time of the waves which have known velocities; and wherein the measuring means is configured to measure the distance of the vehicle to the measuring means to determine the distance of the point where the speed of the vehicle is measured to the marker. - View Dependent Claims (3, 4, 5, 9, 10, 11, 12, 13, 14, 15, 16)
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2. (canceled)
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6. (canceled)
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7. (canceled)
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8. (canceled)
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17. A method for speed measurement verification, which method includes the
following steps automatically measuring the speed of a vehicle travelling on a surface which includes a fixed marker at a predetermined distance from a point where the speed of the vehicle is measured; -
automatically comparing the measured speed of the vehicle to a predetermined speed limit; automatically calculating a time delay if the measured speed exceeds the speed limit, which time delay is calculated according to the measured speed and the predetermined distance so as to predict when the vehicle, if travelling at the measured speed, will reach the marker; and automatically capturing an image with a camera directed at the marker after expiration of the time delay so that, if the measured speed is accurate, the vehicle will be positioned proximate the marker so that the captured image showing the vehicle relative to the marker is able to serve as verification of the accuracy of the measured speed; wherein the step of automatically measuring the speed of the vehicle travelling, on the surface includes determining a change in distance of the vehicle from a stationary transmitter which sequentially transmits at least two pulsed electromagnetic waves having known velocities to the vehicle so that a suitable receiver is able to receive the waves reflected from the vehicle, wherein the known velocity of a wave together with the time taken between transmission and reception of that wave enables the calculation of the distance from the transmitter to a vehicle, so that the speed of the vehicle is calculated by dividing the measured change in distance of the vehicle by a predetermined interval between the transmission of the separate waves to the vehicle; and wherein the step of measuring the speed includes measuring the distance of the vehicle to suitable measuring means to determine the distance of the point where the speed of the vehicle is measured to the marker. - View Dependent Claims (19, 20)
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18. (canceled)
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21. (canceled)
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22. (canceled)
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23. (canceled)
Specification