The Marconi Company Limited

Ronald Arthur Tyler

Luigi De Tullio

The invention provides an apparatus for deriving information concerning the movement of a road vehicle. In a preferred example a single microwave source is mounted under the vehicle to illuminate the road surface. Two receiving ports are provided, one to receive energy reflected from the illuminated surface to one side of the center line of the vehicle and the other to receive energy reflected from the illuminated surface to the other side of the center line. The two Doppler shifts are determined and compared to determine if there is a difference which indicates that the vehicle is turning, the sign of any difference indicating the direction of turn. One of the Doppler signals is shaped and counted to provide an indication of the speed of the vehicle and one of the Doppler signals is processed to provide an indication of forward or reverse motion.

Apparatus for deriving information concerning the movements of a vehicle

A vehicle location system for vehicles travelling over a predetermined route in which equipment in the vehicle derives information concerning the distance travelled from predetermined junctions and the turns made and computing means within the vehicle computes the route between road junctions on which the vehicle is travelling. Each vehicle carries transmitter means for transmitting computed location information to a base station when interrogated by the same.

Location systems

A vehicle location system for vehicles travelling over a predetermined route in which the vehicle sends to a base station information concerning the distance travelled from a predetermined starting point and the turns made, from which information the base station computes the route between road junctions, on which the vehicle is travelling.

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Chelmsford, United Kingdom

Ronald Arthur Tyler