Abstract: A transceiver station is provided for forming a telecommunications network node. The station includes at least two transceiver radio modules and a control module. Each transceiver module is adapted to operate alternatingly as a subscriber station and as a base station, as a function of commands from the control module. The control module is adapted to determine a modification of the state of the network and to dynamically control at least one change in the operation of at least one transceiver module, from subscriber station to base station or vice versa, as a function of at least the determined modification. The control module is adapted so that the number of subscriber stations connected to a base station is at most equal to 1.

Abstract: A transceiver station is provided for forming a telecommunications network node. The station includes at least two transceiver radio modules and a control module. Each transceiver module is adapted to operate alternatingly as a subscriber station and as a base station, as a function of commands from the control module. The control module is adapted to determine a modification of the state of the network and to dynamically control at least one change in the operation of at least one transceiver module, from subscriber station to base station or vice versa, as a function of at least the determined modification. The control module is adapted so that the number of subscriber stations connected to a base station is at most equal to 1.

Abstract: The invention relates to a frequency hopping communication method in which the data travels over time-variable frequency bearers. A frequency bearer is defined as a subset pair of carriers in a channel of a set of frequency channels (RF). The choice of the frequency bearers is derived from a pseudo-random draw.

Abstract: The present invention includes an autonomous antennal device with fast pointing switching. The antennal device has an electron beam switching antenna, and the device is linkable by a cable to a radioelectric facility. The device includes a calculation unit to determine a direction of pointing of the beam of the antenna on the basis of measurement parameters for the radiofrequency signal processed by the facility, and the parameters are received on a communication interface of the device. The invention applies, for example, to intelligent antennas, sometimes designated by the acronym FESA, which stands for Fast Electronically Steerable Antenna.

Abstract: A relay station used in a communication network that has a tree-structured architecture including a number of hierarchical levels, the communication network including a base station of the highest hierarchical level, one or more relay stations and one or more subscriber stations, wherein a relay station has two radio modules, a first radio module being designed to communicate with stations of lower hierarchical level and a second radio module being designed to communicate with stations of higher hierarchical level, the two radio modules being synchronized in their MAC layer and the relay station including at least one antennas connected to the MAC layer of the radio modules.

Abstract: A method and device for implementing a smart antenna in a network that uses a deterministic access protocol, one or more mobile stations MS and at least one base station BS, the transmitted data being included in a data frame, wherein it comprises at least the following steps: On entry into the network: the step of synchronizing a mobile station MS equipped with an FESA directional antenna on a transmission from the base station by changing beam for a duration at least equal to a frame in order to aim the directional beam toward the base station BS to obtain the best signal reception, the step of following the synchronization of the mobile station on the transmission from the base station, and implementing an aiming tracking algorithm in order to retain the best signal reception, the step of determining the parameters for defining the downlink or the uplink by decoding signaling messages contained in the message transmitted by the base station, triggering a network entry procedure.

Abstract: A system and a method for locating one or more mobile objects in a detection space is disclosed. The system has a number of detection terminals (1) wherein at least the majority of the detection terminals and is equipped with an interrogating and/or answering device (2).

Abstract: The invention relates to a frequency hopping communication method in which the data travels over time-variable frequency bearers. A frequency bearer is defined as a subset pair of carriers in a channel of a set of frequency channels (RF). The choice of the frequency bearers is derived from a pseudo-random draw.

Abstract: Disclosed is a method and system of communications in a network using a protocol of transmission of pulses between a master station and one or more user stations. The pulse response of the master station received by the user stations is synchronized. The pulse responses acquired from the user stations are received by the master station. Pulses close to each other are sent from the master station to the different user stations, and from the differnt users to the master station. The pulses are equalized at reception for each user station and for the master station.

Abstract: A precise 3D position-finding system and method comprises at least the following elements: a set of beacons working on the basis of differential global positioning satellites (DGPS), the beacons being connected to one another and temporally synchronized, spread-spectrum radio means between the members of the network whose position is to be located and said beacons, and a computation station. The computation station is provided with a processor adapted to finding the position of one or more elements from a list of direct paths and/or multiple paths with the time and direction of arrival of each of the direct paths and/or multiple paths, and from the position of the beacons and in taking account of data that represents obstacles.

Abstract: In a method and system of communications in a network using a protocol of transmission by pulses between a master station and one or more user stations, the method comprising the steps of synchronizing the pulse response of the master station received by the user stations, acquiring the pulse responses from the user stations received by the master station, sending pulses close to each other from the master station to the different user stations, and from the different users to the master station, and equalizing the pulses at reception for each user station and for the master station.

Abstract: A device for non-selective identification in a communications network comprises several users, the data being exchanged in the form of frames, wherein: at least each user has a data processor responsible for the management of the voice, data and video services; a user who is a master or group leader is equipped with a radio terminal, one or more directional antennas and a processor activated in “master” mode; several users Ui are each equipped with a radio terminal, one or more directional antennas and a processor placed in “slave” mode; a data frame comprises a “non-selective” identification device comprising at least one first part reserved for interrogation by one of the users and a second part enabling users concerned by the response to respond.

Abstract: A precise 3D position-finding system and method comprises at least the following elements: a set of beacons working on the basis of differential global positioning satellites (DGPS), the beacons being connected to one another and temporally synchronized, spread-spectrum radio means between the members of the network whose position is to be located and said beacons, and a computation station. The computation station is provided with a processor adapted to finding the position of one or more elements from a list of direct paths and/or multiple paths with the time and direction of arrival of each of the direct paths and/or multiple paths, and from the position of the beacons and in taking account of data that represents obstacles.

Abstract: A method for transmitting data packets having a heading followed by a data field. The data of the field is transmitted by groups of symbols. According to the OFDM technique, subcarriers modulated by the groups are generated. A frequency modulation of a carrier signal delivered by a linear ramp generator is produced with a set of modulated subcarriers. When the signal is received, mixing with a linear ramp results in subcarriers which are separated and then demodulated for supplying data. This is useful for transmitting data packets particularly in wide band networks.

Abstract: The invention proposes a novel method for using the signals provided by an airborne FM/CW radio altimeter, allowing to perform an analysis of the ground overflown by an aircraft for the purpose of, for example, identifying it, or alternatively of recognizing it. The method of the invention consists in analyzing, in the frequency domain, the shape of the spectrum of the beat signal generated by said radio altimeter to characterize said ground so as to extract from it information relating to the reflectivity of said ground.

Abstract: A spectral analysis carried out on the beat signals obtained by the mixing of a transmission signal, the frequency of which is modulated in the form of recurrent sawteeth, with this same signal after it has been transmitted, reflected and then received. The spectral analysis is based on the computation of self-correlation coefficients enabling the definition of the spectral components. For this purpose, the coefficients are computed at each sawtooth and are combined with the coefficients determined with the most recent previous sawteeth to give so-called global coefficients, from which the spectral components sought are restituted in a conventional way. Application especially to altimeters for the measurement of small heights.

Abstract: The disclosure pertains to the localization of a station by another station in a network for the transmission of data in packets, each packet being formed by a header followed by an information field at a carrier frequency that varies according to a linear ramp. The method consists, in a first station, in sending out an interrogation packet with a designation of a second station, in the second station, upon the reception of this interrogation packet, in sending a signal in continuity with the field of the packet received and according to the same ramp and, in the first station, in measuring the delay of this signal, when it is received, with respect to a signal produced in the first station after the field of the packet sent out and in deducing the distance between the two stations from the delay. Application to the measurement of distances.

Abstract: The system for wireless transmission of medical data comprises a piece of transmission equipment carried by the patient which comprises a unit for differential amplification and band filtering, a unit for rejection of interference noises, particularly the sector and its harmonics, existing in the band of the useful signal, an amplification circuit with automatic gain control and a modulator receiving a carrier frequency, for example microwave at 2.45 GHz and the useful signal, in analog or after a digital conversion and optional processings. The system also comprises a suitable receiving station. The carrier frequency can be either generated in the transmission equipment, or in the receiving station which then transmits the nonmodulated carrier for the transmitters that are associated with it.

Abstract: This radar system for measuring the nearest distance "h" comprises transmitting means (9, 7, 5) for transmitting towards an object a frequency-modulated wave, receiving means (15, 17) for receiving the wave after reflection by the object, mixing means (20) for producing a beat-frequency wave between the transmitted wave and the received wave, high-speed digital processing means (30) for effecting a time-frequency transformation operation of the beat-frequency wave; it further comprises management means (50) for providing the user with the value "h" by influencing more specifically the transmitting means and the high-speed digital processing means.

Abstract: A method for transmitting data packets having a heading followed by a data field. The data of the field is transmitted by groups of symbols. According to the OFDM technique, subcarriers modulated by the groups are generated. A frequency modulation of a carrier signal delivered by a linear ramp generator is produced with a set of modulated subcarriers. When the signal is received, mixing with a linear ramp results in subcarriers which are separated and then demodulated for supplying data. This is useful for transmitting data packets particularly in wide band networks.