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'Across-the-Road Photo Traffic Radars: New Calibration Techniques'



Claude Weil, Dennis G. Camell, David R. Novotny, Robert T. Johnk


We discuss simulator units for calibrating across-the-road Doppler traffic radar transceivers used in enforcement of highway speed limits. Two units of very similar design were developed, one operating at K-band (24 GHz) and the other at Ka-band (35 GHz). The signal received from the radar transmitter is frequency-modulated at rates that correspond to the expected Doppler shift for approaching and receding vehicles travelling at speeds of 25 to 200 km/h. The modulated signal is subsequently retransmitted back to the radar receiver, which demodulates it and then displays the simulated speed . The required calibration accuracy is 1.6 km/h at 90 km/h.
Proceedings Title
Conference Dates
May 17-19, 2004
Conference Location
Warsaw, 1, PL


Calibration, Doppler, radar, speed measurement, traffic


Weil, C. , Camell, D. , Novotny, D. and Johnk, R. (2004), 'Across-the-Road Photo Traffic Radars: New Calibration Techniques', MICROWAVE & RADAR WEEK IN POLAND, Warsaw, 1, PL (Accessed February 23, 2024)
Created May 16, 2004, Updated October 12, 2021