METHOD AND DEVICES FOR DETERMINING THE DISTANCE BETWEEN A RADIO BEACON AND A VEHICLE DEVICE

摘要

#CMT# #/CMT# The method involves receiving signal in radio beacon during vehicle passage. The curve of frequency over time is recorded in relation to known frequency curve. A change in recorded frequency curve exceeding predetermined threshold value is detected. Two far regions in frequency curve lying before and after detected change in time and showing frequency change below threshold value are obtained. The frequency curve is scaled, so that predetermined values are assumed by far regions. A distance from gradient of scaled frequency curve in inflection point is determined. #CMT# : #/CMT# An independent claim is included for a radio beacon. #CMT#USE : #/CMT# Method for determining distance of vehicle from radio beacon (claimed) of road toll system. #CMT#DESCRIPTION OF DRAWINGS : #/CMT# The drawing shows the system for determining distance of vehicle from radio beacon of road toll system.