Ground speed sensor technology developed for motor vehicles
Monday, October 20, 2008 - 14:23
in Physics & Chemistry
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.