Abstract
The development of automated guided or non-guided terrestrial transportation systems asks for the conception of small-sized, low-cost, low time constant and high accuracy sensors giving reliable information on the speed, the distance covered and the forward or backward motion of the vehicle.These data must be obtained through measurements in the real-time domain and this involves that contactless and very low time-eonstant sensors must be used. On the other hand, the applications concerned ask for a miniaturisation of the whole measurement system. For these reasons, sensors using the Doppler effect in the microwave range are particularly well convenient to these applications.
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