Method and Device for Determining the Vehicle Class of Vehicles
First Claim
1. Method for classifying vehicles with reference to their vehicle length comprising directing a radar beam in the form of a radar cone toward a roadway, said beam having a beam spread angle horizontally oriented at an acute positioning angle at a distance to the roadway and through evaluation of the radar signals generated by reflection on a vehicle traveling on the roadway, a driven distance over which the vehicle reflects the radar beam while traveling, determining from the signals, a range value by means of which a passage distance is determined, over which the vehicle travels through the radar cone and determining the vehicle length by comparing said length with vehicle lengths that are typical for individual vehicle classes, from the difference between the driven distance and the passage distance, in order to classify the vehicle.
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Abstract
The invention relates to a method and device with which a vehicle traveling through a radar cone is classified by means of length criteria. The length criteria are formed by the difference of the driven distance that the vehicle covers, during which it reflects the radar beam, and the passage distance of the vehicle through the radar cone, which gives a more or less precise measurement for the vehicle length according to the accuracy of the determined passage distance. For determining the passage distance, range values are derived from the radar signals.
29 Citations
15 Claims
- 1. Method for classifying vehicles with reference to their vehicle length comprising directing a radar beam in the form of a radar cone toward a roadway, said beam having a beam spread angle horizontally oriented at an acute positioning angle at a distance to the roadway and through evaluation of the radar signals generated by reflection on a vehicle traveling on the roadway, a driven distance over which the vehicle reflects the radar beam while traveling, determining from the signals, a range value by means of which a passage distance is determined, over which the vehicle travels through the radar cone and determining the vehicle length by comparing said length with vehicle lengths that are typical for individual vehicle classes, from the difference between the driven distance and the passage distance, in order to classify the vehicle.
- 13. Device for classifying vehicles with reference to their vehicle length comprising a radar device which directs a radar beam in the form of a radar cone with a beam spread angle horizontally over a roadway at an acute positioning angle at a distance to the roadway and which receives a radar beam reflected by a vehicle and which forms radar signals, and an evaluation and memory unit connected to said radar device for determining the driven distance, over which a vehicle reflects the radar beam while traveling, from the radar signals, said evaluation and memory unit being designed to form at least one range value by means of which a passage distance over which the vehicle travels through the radar cone is determined in a downstream computing unit and a difference generator which is connected to the computing unit and the evaluation and memory unit and which determines the vehicles length from the difference between the driven distance and the passage distance, provides this length to a downstream comparator which is connected to the difference generator and which is suitable for comparing the determined vehicle length with stored vehicle lengths that are typical for defined vehicle classes, in order to classify the vehicle.
Specification