Contactless determination of vehicle movement involves using independent DSPs to process electromagnetic radiation from electronic evaluation unit to determine vehicle movement using Doppler effect

摘要

The method involves transmitting and driving path acoustic waves or electromagnetic radiation of different angles separately in determined Doppler frequency spectra (f1,f2) which are then supplied to an electronic evaluation unit. Independent digital signal processors (DSP) (a,b,c) process the electronic evaluation unit output fed through an interface (K) to determine vehicle movement. The reflected or scattered radiation or waves are fed to the electronic evaluation unit to calculate vehicle speed using Doppler effect. The transmitter and receiver (d,e) are arranged in overlapping areas for emitting and receiving beam or wave cones.