1. Device for measuring the magnetic signatures of vehicles including: at least a first set of sensors (C x i ) designed to be arranged along at least a first direction ( 2 ), at least a second set of sensors (C y j ), designed to be arranged along at least a second direction ( 4 ), that intersects the first direction at a point at which a common sensor (C xy 0 ) is placed, belonging to the first and the second set, calculation means ( 50 ) to calculate a relation between the time signature S o (t) of a vehicle passing above the common sensor and a spatial profile S o (x) resulting from measurements made by the sensors in the first set of sensors.