Method and apparatus for determining the speed and location of a vehicle
First Claim
1. A method for measuring the speed of a vehicle comprising the steps oftransmitting a wave beam directed at the vehicle, receiving a part of the wave beam reflected by the vehicle, comparing the reflected beam part with the transmitted wave beam, deriving from this comparison both the speed and the position of the vehicle, comparing the measured speed with a maximum allowed speed, and generating a warning signal when a speeding offense is determined, wherein the position of the vehicle is determined from a time lag detected during the comparison between the moment of transmitting and the moment of receiving the reflected beam part, and the speed of the vehicle is derived when the position of the vehicle is determined to be within a desired traffic lane to correspond to a defined time that is compared within a measuring window.
1 Assignment
0 Petitions
Accused Products
Abstract
Disclosed is a method and apparatus for measuring the speed of a vehicle by transmitting a wave beam directed at the vehicle, receiving a part of the wave beam reflected by the vehicle, comparing the reflected beam part with the transmitted wave beam and deriving from this comparison the speed of the vehicle, wherein during the speed measurement the position of the vehicle is also determined. A vehicle committing an offense can thus be identified unambiguously in a recording which is made after detection of the speeding offense. The speed of the vehicle can be determined from a difference in wavelength detected during the comparison between the reflected beam part and the transmitted wave beam, while the position of the vehicle is determined from a time lag detected during the comparison between the moment of transmitting and the moment of receiving the reflected beam part.
65 Citations
13 Claims
-
1. A method for measuring the speed of a vehicle comprising the steps of
transmitting a wave beam directed at the vehicle, receiving a part of the wave beam reflected by the vehicle, comparing the reflected beam part with the transmitted wave beam, deriving from this comparison both the speed and the position of the vehicle, comparing the measured speed with a maximum allowed speed, and generating a warning signal when a speeding offense is determined, wherein the position of the vehicle is determined from a time lag detected during the comparison between the moment of transmitting and the moment of receiving the reflected beam part, and the speed of the vehicle is derived when the position of the vehicle is determined to be within a desired traffic lane to correspond to a defined time that is compared within a measuring window.
-
7. An apparatus for measuring the speed of a vehicle comprising
means for generating and transmitting a directed wave beam, means for receiving a part of the wave beam reflected by a vehicle, means for comparing the reflected beam part with the transmitted beam and deriving both speed and the position of the vehicle from this comparison, means for comparing the measured speed with a maximum allowed speed, and means generating a warning signal when a speeding offense is determined, wherein the position determining means derives the position of the vehicle from a measured time lag, and the speed determining means derives the speed of the vehicle when the position of the vehicle is determined to be within a desired traffic lane to correspond to a defined time that is compared within a measuring window.
Specification