Across-the-road photo traffic radars: new calibration techniques

Author

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

Author_Institution

Div. of Electromagn., Nat. Inst. of Stand. & Technol., Boulder, CO, USA

Volume

3

fYear

2004

fDate

17-19 May 2004

Firstpage

889

Abstract

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.

Keywords

Doppler radar; Doppler shift; FM radar; calibration; demodulation; radar imaging; radar receivers; radar transmitters; road traffic; road vehicle radar; 24 GHz; 25 to 200 kph; 35 GHz; Doppler shift; Doppler traffic radar transceiver; across-the-road photo traffic radar; calibration accuracy; calibration technique; demodulation; frequency-modulation; radar receiver; radar transmitter; Calibration; Doppler radar; Doppler shift; Frequency; K-band; Road transportation; Traffic control; Transceivers; Transmitters; Vehicles;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwaves, Radar and Wireless Communications, 2004. MIKON-2004. 15th International Conference on

Print_ISBN

83-906662-7-8

Type

conf

DOI

10.1109/MIKON.2004.1358507

Filename

1358507