Robust Speed Measurements with Standard Wireless Devices

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Schneider, J., & Caracas, A. (2017). Robust Speed Measurements with Standard Wireless Devices. IET Wireless Sensor Systems, 7(2), 35-43.

Publication type

Article in Scientific Journal


Speed measurements are crucial for controlling traf?c and in supporting automation of industrial processes. The speed of moving objects is typically measured from a stationary position using time-of-flight or the Doppler Effect. Existing approaches require either relatively bulky physical devices or complex signal processing. We propose a new method for measuring the speed of (metal) objects moving on a fixed track. Our method is applicable for example to cars on a road, trains on rails, or goods sliding on a conveyor belt. The method relies on the constructive and destructive interference patterns created by the re?ections from the moving target. Speed is determined by measuring the signal strength of received messages as perceived by standard wireless devices. The method requires only minimal signal processing and only two commodity wireless transceivers, which are independent of the moving target. The advantages of our system compared to other technologies are reduced size, reduced cost, and in some scenarios robustness.


Organizational Units

  • Institute of Information Systems
  • Hilti Chair of Business Process Management