True ground speed sensor

Details True ground speed sensor True ground speed sensor

G - Physics

01

S

G01S 17/88 (2006.01) G01P 3/36 (2006.01)

Patent

CA 2052244

TRUE GROUND SPEED SENSOR ABSTRACT OF THE INVENTION A speed sensor for a moving vehicle. A transmissive grating is used in conjunction with an electromagnetic wave source and beam combining waveguide to mix two beams of frequency f and f + .DELTA.f, where .DELTA.f is proportional to the speed of the grating relative to the ground. The source energy is reflected off the road to the grating. The zero- th and first order transmission from the grating are mixed to give the beat frequency .DELTA.f proportional to the ground speed. The sensor has no moving parts, and is independent of any gear ratios.

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