System for transmission of information between the ground and moving objects, in particular in ground-train communications
AssigneeSociete Nationale des Chemins de fer Francais
InventorPatrice H. Bernard
Life of this patent
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Abstract
A system for transmitting data between the ground and moving vehicles, for example consisting of a stretch of railway line V.sub.1 having beacons between the rails. The various beacons are connected to nodes, e.g. N.sub.i, N.sub.j, N.sub.k, which are in turn linked to a nodal transmission point (CNT) and to fixed railway installations controlling, for example, a points motor. The system is useful particularly in the field of data transmission between the ground and moving railway vehicles such as locomotives, passenger coaches, freight wagons, and train units.
Claims13
A short-range bidirectional transmission system comprising a ground-based network including a plurality of beacons disposed successively along a path on the ground, each beacon having a maximum coverage length, and a moving object having an antenna and being operative to move along said path, wherein said antenna installed on the moving object has a coverage area substantially longer in the longitudinal dimension of the moving object (i) than in the transverse direction and (ii) than said maximum coverage length of each of said beacons.
Dependencies are inferred from the claim text.