Method for detecting a wheel of a vehicle

摘要

A vehicle wheel is detected by emitting a measuring beam, recording frequencies of a reflected measuring beam over time as a received signal, and detecting a change in the received signal as a wheel. The vehicle comprises an onboard unit that stores information that indicates the vehicle length at least indirectly. The information is read from the onboard unit by a radio communication and the speed of the vehicle is measured. The duration of the passage of the vehicle passing a detector unit is computed based on this information and the speed. A time window in the received signal is determined that shows an approximately constant change of the received signal over the aforementioned duration. A spurious signal component is determined in a segment of the received signal that immediately precedes the time window. The received signal in the time window is compensated by the spurious signal component.

主权项

1. A method for detecting a wheel of a vehicle by emitting an electromagnetic measuring beam having a known frequency progression over time from a detector unit, recording frequencies of the measuring beam that is reflected to the detector unit over time relative to the known frequency progression over time as a received signal, and detecting a change of a predetermined kind in the received signal as a wheel,
wherein the vehicle comprises an onboard unit, which can establish a radio communication with a transceiver of the detector unit and stores information that indicates the vehicle length at least indirectly, comprising: reading said information from the onboard unit by way of a radio communication and measuring the speed of the vehicle; computing the duration of passage of the vehicle passing the detector unit based on this information and the speed; determining a time window in the received signal which shows an approximately constant change of the received signal over the aforementioned duration; determining a spurious signal component in a segment of the received signal that immediately precedes the time window; and compensating the received signal in the time window by the spurious signal component before the aforementioned detection of the wheel is carried out.