Vehicle speed determination system and method
First Claim
1. A method for verifying the speed of a vehicle having at least a front axle and a rear axle using sensors, the sensors being separated by a distance, the method including the following steps:
- (a) sensing a presence of the vehicle;
(b) recording an image of the vehicle to enable the vehicle to be identified;
(c) triggering the sensors to each emit a signal;
(d) receiving the signals emitted by the sensors;
(e) determining the speed of the vehicle;
(f) determining a wheel base measurement for the vehicle;
(g) identifying the vehicle from the recorded image of the vehicle;
(h) comparing the determined wheel base measurement to a validated wheel base measurement of the vehicle being sensed; and
(i) identifying a discrepancy between the determined wheel base measurement and the validated wheel base measurement of the vehicle being sensed as potential errors in the speed of the vehicle determined by step (e).
1 Assignment
0 Petitions
Accused Products
Abstract
A method for verifying the speed of a vehicle having at least a front axle and a rear axle, using sensors separated by a distance. The presence of the vehicle is sensed and an image of the vehicle is recorded to enable the vehicle to be identified. The sensors are triggered to emit signals which are received by the system to enable the speed of the vehicle to be determined. The signals are also used to determine a wheel base measurement for the vehicle. The determined wheel base measurement is compared to an actual wheel base measurement of the vehicle being sensed and any discrepancy between them is taken to be indicative of potential errors in the speed of the vehicle determined by the method. In one embodiment, the a database is provided, the database containing data relating to various vehicle types associated with vehicle specifications including a validated wheel base measurement for each vehicle type.
11 Citations
25 Claims
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1. A method for verifying the speed of a vehicle having at least a front axle and a rear axle using sensors, the sensors being separated by a distance, the method including the following steps:
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(a) sensing a presence of the vehicle; (b) recording an image of the vehicle to enable the vehicle to be identified; (c) triggering the sensors to each emit a signal; (d) receiving the signals emitted by the sensors; (e) determining the speed of the vehicle; (f) determining a wheel base measurement for the vehicle; (g) identifying the vehicle from the recorded image of the vehicle; (h) comparing the determined wheel base measurement to a validated wheel base measurement of the vehicle being sensed; and (i) identifying a discrepancy between the determined wheel base measurement and the validated wheel base measurement of the vehicle being sensed as potential errors in the speed of the vehicle determined by step (e). - View Dependent Claims (2, 3, 4, 5)
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6. A method for verifying the speed of a vehicle having at least a front axle and a rear axle using sensors, the sensors being separated by a distance, the method including the following steps:
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(a) sensing a presence of the vehicle; (b) recording an image of the vehicle to enable the vehicle to be classified according to type; (c) triggering the sensors to emit a signal; (d) receiving the signals emitted by the sensors; (e) determining the speed of the vehicle; (f) determining a wheel base measurement for the vehicle; (g) identifying a vehicle from the recorded image of the vehicle; (h) comparing the determined wheel base measurement to a validated wheel base measurement of the vehicle being sensed; (i) identifying a discrepancy between the determined wheel base measurement and the validated wheel base measurement of the vehicle being sensed as potential errors in the speed of the vehicle determined in step (e); and (j) providing a database containing data relating to various vehicle types associated with vehicle specifications including a validated wheel base measurement for each vehicle type; wherein the wheel base measurement determined by the method is compared to the validated wheel base measurement stored in the database. - View Dependent Claims (7, 8, 9, 10)
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11. A system for verifying the speed of a vehicle having at least a front and rear axle, the system including:
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(a) a camera for recording an image of the vehicle to enable the vehicle to be identified; (b) at least two sensors separated by a distance which are triggered to emit a signal by the front and rear axles; (c) means for receiving the signals emitted by the sensors; (d) means for using the signals to determine the speed of the vehicle; and (e) means for using the signals to determine a wheel base measurement for the vehicle; (f) means for identifying a vehicle from the recorded image of the vehicle; (g) means for comparing the wheel base measurement determined by the system to a validated wheel base measurement of the vehicle being sensed; and (h) means for identifying any discrepancy between the determined wheel base measurement and the validated wheel base measurement of the vehicle being sensed as an indication of potential errors in the speed of the vehicle determined by the system. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A system for verifying the speed of a vehicle having at least a front and rear axle, the system including:
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(a) a camera for recording an image of the vehicle to enable the vehicle to be classified according to type; (b) at least two sensors separated by a distance which are triggered to emit a signal by the front and rear axles; (c) means for receiving the signals emitted by the sensors; (d) means for using the signals to determine the speed of the vehicle; (e) means for using the signals to determine a wheel base measurement for the vehicle; and (f) means for identifying a vehicle from the recorded image of the vehicle; (g) means for comparing the wheel base measurement determined by the system to a validated wheel base measurement of the vehicle being sensed; (h) means for identifying a discrepancy between the determined wheel base measurement and the validated wheel base measurement of the vehicle being sensed as potential errors in the speed of the vehicle determined in step (f); and (i) a database containing data relating to various vehicle types associated with vehicle specifications including a validated wheel base measurement for each vehicle type; wherein the wheel base measurement determined by the system is compared to the validated wheel base measurement stored in the database. - View Dependent Claims (18, 19, 20, 21, 22, 24)
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23. A system for verifying the speed of a vehicle having at least a front and rear axle, the system including:
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(a) a camera for recording an image of the vehicle to enable the vehicle to be classified according to type; (b) at least two sensors separated by a distance which are triggered to emit a signal by the front and rear axles; (c) means for receiving the signals emitted by the sensors; (d) means for using the signals to determine the speed of the vehicle; (e) means for using the signals to determine the number of axles for the vehicle; and (f) means for identifying a vehicle from the recorded image of the vehicle; (g) means for comparing the wheel base measurement determined by the system to a validated wheel base measurement of the vehicle being sensed; (h) means for identifying a discrepancy between the determined wheel base measurement and the validated wheel base measurement of the vehicle being sensed as potential errors in the speed of the vehicle determined in step (f); and (i) a database containing data relating to various vehicle types associated with vehicle specifications including a validated number of axles for each vehicle type; wherein the axle count determined by the system is compared to the validated axle count stored in the database and any discrepancy between them is indicative of potential errors in the speed of the vehicle determined by the system.
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25. A method of calibrating a vehicle speed determination system using at least two sensors separated by a distance, the vehicle having at least a front and a rear axle, the method including the steps of:
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(a) sensing a presence of the vehicle; (b) recording an image of the vehicle to enable the vehicle to be classified according to type; (c) triggering the sensors to emit a signal; (d) receiving the signals emitted by the sensors; (e) determining the speed of the vehicle; (f) determining a wheel base measurement for the vehicle; (g) providing a database containing data relating to various vehicle types associated with vehicle specifications including a validated wheel base measurement for each vehicle type; (h) comparing the wheel base measurement determined by the system to the validated wheel base measurement; and (i) identifying a discrepancy between the determined wheel base measurement and the validated wheel base measurement of the vehicle being sensed as potential error trends and enable system calibration; and (j) maintaining a register of speed and wheel base measurement data and discrepancies from validated wheel base measurement data.
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Specification