Patent ID: 9684064
Date: 2017-06-20
CPC Classifications: G01S,G08G

Claim:
1. An apparatus for determining a characteristic feature of a vehicle travelling on a roadway, comprising: a detector, which is directed towards the roadway and which is configured to measure a movement vector of the vehicle at a current location at a current time; a tracking unit, connected to the detector, for calculating a target location of the vehicle at a target time using the current location, current time and movement vector; a first radar sensor, connected to the detector, for transmitting a first radar beam directed towards the current location, receiving a first reflected radar beam and determining a first frequency spectrum of the first reflected radar beam; a second radar sensor, connected to the tracking unit, for transmitting a second radar beam, directed towards the target location, at the target time, receiving a second reflected radar beam, and determining a second frequency spectrum of the second reflected radar beam; and an evaluation unit for generating the characteristic feature of the vehicle from the determined frequency spectra, wherein the determined frequency spectra constitute the characteristic feature of the vehicle, and wherein the frequency spectra form the characteristic feature as a surface over a frequency/time plane.