How close to the road surface does that sensor have to be?PeteH wrote:Do I have to Dave.....?
Ps. Far more interesting is the "speed over ground" sensor. These are actually common place (we use them on the F1 car). They don't use radar, they use a laser optical recognition process. It's rather complex, but it essentially looks at the rate of movements of the road texture. They are super accurate, and the only practical method of calculating true car speed. They actually measure speed in two directions (longitudinal and lateral), and some simple maths gives us the "slip angle" of the car, which is also rather important for us. (We also have GPS, but we don't use it much, except under very specific conditions).
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