Traffic radar system

Details Traffic radar system Traffic radar system

G - Physics

01

S

343/12, 343/32

G01S 13/58 (2006.01) G01S 13/60 (2006.01)

Patent

CA 1164984

TRAFFIC RADAR SYSTEM ABSTRACT OF THE DISCLOSURE A traffic radar system is provided in which the speed of a target vehicle is determined by measuring the difference in frequency between a component of a doppler signal which has a frequency proportional to the relative speed of the target vehicle and a moving patrol vehicle and a reference signal having a frequency proportional to the speed of the patrol vehicle. The reference signal is developed from a tachometer device which generates a periodic signal having a frequency proportional to the rotational speed of a vehicle wheel and phase-locked loop arrangements including adjustable dividers are provided for locking an oscillator to the tachometer signal and generating a reference signal at a frequency proportional to the actual speed of the patrol vehicle. For calibra- tion, a component of the doppler signal produced from reflections from stationary objects is used.

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