Radar speedometer

Details Radar speedometer Radar speedometer

G - Physics

01

S

343/32

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

Patent

CA 1133100

RADAR SPEEDOMETER Abstract Method and apparatus for measuring the speed of a land vehicle over a surface. A narrow beam (16) of RF energy is directed toward the surface (18) at a sub- stantial angle. Reflected RF energy is mixed with that transmitted to produce Doppler signals having a spectrum. The spectra of the Doppler signals are normalized by the Doppler signals being applied to an AGC circuit (26) so that the maximum amplitudes of the spectra are substan- tially constant and being applied to one or more tracking band pass filters (30, 32, 34) which eliminate unwanted frequency components in the spectra. From the normalized spectra, output signals are produced from which can be determined the speed of the vehicle relative to the surface.

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