Ground speed sensor technology developed for motor vehicles

Hitachi, Ltd. announced the development of a compact and low cost speed sensor technology for motor vehicles which provides accurate measurement of relative velocity using an mm–wave radar (77GHz band). The technology enables the relative velocity of a motor vehicle to the ground to be measured by beaming millimeter–wavelength radio waves (mm–wave) on to the ground. Compared to conventional wheel–speed sensors which calculate velocity by detecting wheel rotation, the new sensor is able to measure velocity even during braking or slipping when the tires are not rotating.

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<p><a href="http://www.physorg.com/news143731098.html">Ground speed sensor technology developed for motor vehicles </a></p> <p>Hitachi, Ltd. announced the development of a compact and low cost speed sensor technology for motor vehicles which provides accurate measurement of relative velocity using an mm–wave radar (77GHz band). The technology enables the relative velocity of a motor vehicle to the ground to be measured by beaming millimeter–wavelength radio waves (mm–wave) on to the ground. Compared to conventional wheel–speed sensors which calculate velocity by detecting wheel rotation, the new sensor is able to measure velocity even during braking or slipping when the tires are not rotating.</p>