Abstract: A method for determining the multipath components of a propagation channel in a geolocation system or an IR-UWB telecommunications system. The IR-UWB emitter emits a plurality of UWB impulses at a plurality of central frequencies, sequentially or in parallel. The receiver translates the response of the channel to each of these impulses into the baseband, integrates it over a plurality of time intervals in order to provide intensity samples related to successive times of flight. The intensity samples related to the same time of flight and to the various frequencies are combined in order to provide a composite sample at the output of a multiband IR-UWB receiver module. The multipath components are determined from the composite samples exceeding a predetermined threshold value.

Abstract: A method for determining the multipath components of a propagation channel in a geolocation system or an IR-UWB telecommunications system. The IR-UWB emitter emits a plurality of UWB impulses at a plurality of central frequencies, sequentially or in parallel. The receiver translates the response of the channel to each of these impulses into the baseband, integrates it over a plurality of time intervals in order to provide intensity samples related to successive times of flight. The intensity samples related to the same time of flight and to the various frequencies are combined in order to provide a composite sample at the output of a multiband IR-UWB receiver module. The multipath components are determined from the composite samples exceeding a predetermined threshold value.

Abstract: A method for generating a secret key shared by a group of at least three terminals from characteristics of wireless communication channels connecting the terminals in twos, including, at each of the terminals of the group, the implementation of the following steps of: acquiring signals from wireless communication channels, known as adjacent channels, connected to the terminal and generating a representation of each adjacent channel; for at least one wireless communication channel, known as a non-adjacent channel, not connected to the terminal, acquiring at least one image signal of the non-adjacent channel and generating a representation of the non-adjacent channel, determining the secret key from a combination of the representations of the adjacent channels and at least one representation of non-adjacent channel.

Abstract: A method for positioning a collection of nodes within a wireless sensor network in which each node measures Respective Strength of Signals (RSSs), from its neighboring nodes, and channels linking regular nodes and its neighboring nodes are classified into different categories and are allocated path loss parameters accordingly. Distances separating each regular node from each of its neighboring nodes, and respective variances thereof, are estimated on the basis of the measured RSSs and the allocated path loss parameters. The positions of the regular nodes are then estimated by Weighted Least Square, optimization where the distances to be matched and the variances used for the weighting are those previously estimated.

Abstract: A method for generating a secret key shared by a group of at least three terminals from characteristics of wireless communication channels connecting the terminals in twos, including, at each of the terminals of the group, the implementation of the following steps of: acquiring signals from wireless communication channels, known as adjacent channels, connected to the terminal and generating a representation of each adjacent channel; for at least one wireless communication channel, known as a non-adjacent channel, not connected to the terminal, acquiring at least one image signal of the non-adjacent channel and generating a representation of the non-adjacent channel, determining the secret key from a combination of the representations of the adjacent channels and at least one representation of non-adjacent channel.

Abstract: A method for estimating a range between a radio signal emitter and a receiver. A first range estimate is obtained from a signal strength of a received signal and a path loss model with predetermined path loss parameters. This range estimate is further corrected with a systematic bias depending upon an actual finite sensitivity of the receiver. Optionally a corrected variance of the range estimate can be calculated.

Abstract: A method and a device for cooperative location of a first node possessed by a first mobile body comprising several nodes able to transmit and/or receive a signal by wireless means, comprises a step of measurements of distances separating the first node from second nodes, each of the second nodes being possessed by one of the following entities chosen from among: the first mobile body, a remote fixed apparatus and a second mobile body both situated within transmission range of the said mobile body, at least two nodes from among all the second nodes used to perform the distance measurements being possessed by two entities of distinct types and/or by the second mobile body, a step making it possible to utilize the measurements so as to locate at least the first node at least in relation to some of the second nodes.

Abstract: A method for positioning a node within a wireless sensor network in which each node measures RSSs from its neighboring nodes. Path loss parameters of a channel between a regular node and a neighboring node are first obtained. Distances separating each regular node from its neighboring nodes are then estimated on the basis of the measured RSSs, the allocated path loss parameters. Each distance estimate is further corrected by a systematic bias depending upon the actual sensitivity of the receiver. The positions of the regular nodes are estimated from the distance estimates thus corrected.

Abstract: A method for estimating a range between a radio signal emitter and a receiver. A first range estimate is obtained from a signal strength of a received signal and a path loss model with predetermined path loss parameters. This range estimate is further corrected with a systematic bias depending upon an actual finite sensitivity of the receiver. Optionally a corrected variance of the range estimate can be calculated.

Abstract: A method for positioning a collection of nodes within a wireless sensor network in which each node measures Respective Strength of Signals (RSSs), from its neighboring nodes, and channels linking regular nodes and its neighboring nodes are classified into different categories and are allocated path loss parameters accordingly. Distances separating each regular node from each of its neighboring nodes, and respective variances thereof, are estimated on the basis of the measured RSSs and the allocated path loss parameters. The positions of the regular nodes are then estimated by Weighted Least Square, optimization where the distances to be matched and the variances used for the weighting are those previously estimated.

Abstract: A method for positioning a node within a wireless sensor network in which each node measures RSSs from its neighboring nodes. Path loss parameters of a channel between a regular node and a neighboring node are first obtained. Distances separating each regular node from its neighboring nodes are then estimated on the basis of the measured RSSs, the allocated path loss parameters. Each distance estimate is further corrected by a systematic bias depending upon the actual sensitivity of the receiver. The positions of the regular nodes are estimated from the distance estimates thus corrected.

Abstract: A method and a device for cooperative location of a first node possessed by a first mobile body comprising several nodes able to transmit and/or receive a signal by wireless means, comprises a step of measurements of distances separating the first node from second nodes, each of the second nodes being possessed by one of the following entities chosen from among: the first mobile body, a remote fixed apparatus and a second mobile body both situated within transmission range of the said mobile body, at least two nodes from among all the second nodes used to perform the distance measurements being possessed by two entities of distinct types and/or by the second mobile body, a step making it possible to utilize the measurements so as to locate at least the first node at least in relation to some of the second nodes.

Abstract: Device for determining a characteristic of a trajectory formed of successive positions of a triaxial accelerometer (3A) rigidly tied to a mobile element (EM), between a first instant of immobility (t0) and a second instant of immobility (tn) of the triaxial accelerometer (3A), subsequent to said first instant of immobility (t0), said device comprising, furthermore, a triaxial additional sensor for measuring a vector of a substantially constant vector field between said first and second instants of immobility (t0,tn), in a fixed global reference frame (GE) tied to the terrestrial reference frame, said additional sensor being rigidly tied to said mobile element (EM) and fixed in the reference frame of the accelerometer (3A), and control means (CMD).

Abstract: A method for locating a UWB transmitter, without a previously-set reference, using at least one first set of at least three UWB searching transceivers, including first, second, and third transceivers. The method a) synchronizes the three UWB searching transceivers, arranged at three different points, and estimates the relative position of these three points; b) receives, by the three transceivers, signals transmitted by the transmitter to be located; and c) calculates the relative position, with respect to the three searching transceivers, of the transmitter to be located according to the time of travel of the signals, transmitted by the transmitter to be located, to the three searching transceivers.