Abstract: A system for determining the movement properties of a guided vehicle along a section adapted for a lane signaling control. The vehicle includes at least four onboard transponders that are arranged in pairs. The two transponders of each pair are aligned in parallel to the longitudinal axis of the vehicle, with at least one pair downstream and at least one pair upstream from the vehicle, and providing distinct identification means. At least one transponder reader is provided on the ground at each end of the section. A ground calculator communicates with the readers and determines, upon the passage of at least two transponders of a vehicle, a driving direction and a front/rear intrinsic orientation of the vehicle relative to the lane.

Abstract: A method for checking the reading of at least one mobile radiofrequency transponder moving relative to an antenna of a reader of the transponder, includes: at least one guaranteed reading area is defined around the antenna; at least one checking transponder is attached in the periphery of the guaranteed reading area in order to have the reading thereof periodically checked by the reader in addition to reading the mobile transponder. Examples of equipment for implementing the method are also provided.

Abstract: A system for determining the movement properties of a guided vehicle along a section adapted for a lane signaling control. The vehicle includes at least four onboard transponders that are arranged in pairs. The two transponders of each pair are aligned in parallel to the longitudinal axis of the vehicle, with at least one pair downstream and at least one pair upstream from the vehicle, and providing distinct identification means. At least one transponder reader is provided on the ground at each end of the section. A ground calculator communicates with the readers and determines, upon the passage of at least two transponders of a vehicle, a driving direction and a front/rear intrinsic orientation of the vehicle relative to the lane.

Abstract: A secure system has two computers that are intrinsically safe and implements a method for verifying the redundancy for the outputs where a very high level of safety is required. The method makes it possible to handle inconsistencies in the outputs of the two computers when they are working in redundant mode. Each computer receives the output states determined by the other computer and compares them to states calculated. A state of divergent operation is detected if the computers have determined two different states for a single output. If a divergence is detected for at least one output, the state of that output is determined by preventing any transition from a restrictive state to a permissive state.

Abstract: A secure system has two computers that are intrinsically safe and implements a method for verifying the redundancy for the outputs where a very high level of safety is required. The method makes it possible to handle inconsistencies in the outputs of the two computers when they are working in redundant mode. Each computer receives the output states determined by the other computer and compares them to states calculated. A state of divergent operation is detected if the computers have determined two different states for a single output. If a divergence is detected for at least one output, the state of that output is determined by preventing any transition from a restrictive state to a permissive state.

Abstract: For measuring an amount of relative movement between two elements, such as a vehicle and a track, which are mutually movable, two successive pulses of coherent light are directed from the vehicle to the track under a same incidence angle. From a same location of the vehicle, two images of the interference patterns due to the short pulses are formed. The two pulses are offset from each other in the direction of movement by a distance d approximately corresponding to the amount of relative movement between the two pulses. The actual amount of movement is computed as being the movement which provides the best coincidence between the two images. The comparison can be made by cross-correlation.

Abstract: The safety control device with digital input and analog output, is intended to deliver a mean output power above a specified threshold when two binary input sequences which are complementary or in phase opposition are applied to the input and an output power appreciably below the threshold in all other cases. It comprises a primary voltage source (18) supplying a cascade of several modules (16.sub.1 , . . . , 16.sub.k) each having an AC converter bridge and a rectifier, each branch of the AC converter bridge being controlled by one of the sequences.