Abstract:
The invention relates to a method and a device for integrating signals transmitted from a transmitter (1) to at least one Ultra Wide Band (UWB) receiver (3), characterized in that the measurement is initialized beforehand by estimating an initial clock drift ΔDHinit between the transmitter (1) and the receiver (2), an iterative loop is carried out during which: a step of integrating at least one primary signal received composed of at least two samples is carried out during which at least one first integration is carried out using the estimated clock drift and at least one second and one third integration are carried out respectively increased and decreased by a predetermined value, from among the said at least three integrations is selected that one which maximizes a quality criterion, and, if appropriate, the clock drift is adapted to that corresponding to the integration selected.
Abstract:
This invention relates to parallel architecture digital filter and signal receiver with spectrum spreading using such a filter, the filter may have p shift registers (Rp, Ri) with means for calculating a weighted sum of stored samples in the registers, p weighted sums (Skp, Ski) may be obtained and recombined with number p being, for example, equal to 2.
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.
Abstract:
This invention relates to parallel architecture digital filter and signal receiver with spectrum spreading using such a filter, the filter may have p shift registers (Rp, Ri) with means for calculating a weighted sum of stored samples in the registers, p weighted sums (Skp, Ski) may be obtained and recombined with number p being, for example, equal to 2.
Abstract:
A process for non coherent DP-MOK reception with combination of multiple paths and corresponding receiver. The process includes demodulation of orthogonal signals (MOK) which is combined with differential phase demodulation (DP) and diversity processing related to multiple paths in the radiofrequency channel. Diversity processing is achieved making use of differential demodulation by calculating a weighting factor, this factor then being used in the MOK part (before selecting and switching) and in the DP part to correct the calculated energy.
Abstract:
The invention relates to a device for detecting the presence of an object or of a living being between two end points. This device comprises, on the one hand, a means for emitting an electromagnetic signal comprising an emit antenna associated with a first end point, and a means for exciting this antenna so as to make this antenna emit such a signal and, on the other hand, a means for receiving this electromagnetic signal comprising a receive antenna associated with a second end point, together with means for detecting such a signal. This detection device is characterized in that the emit and receive antennas each adopt the form of a tubular waveguide having at least one wall provided with at least one opening. The invention further relates to an installation for protecting, for counting or for closing an opening equipped with such a detection device.
Abstract:
The invention relates to a learning process for an ultra wideband communication system with M transmission antennas and N reception antennas and in which the information is modulated on L possible positions comprising the following steps: a) transmit a series of Nseq learning pulses from each emission antenna to all reception antennas. b) for each reception antenna j, estimate the M composite responses of series of emitted pulses that arrive at this reception antenna j, each composite response being estimated by eliminating the effects of other antennas. c) estimate correlations between the different channels.
Abstract:
A generator of repetitive sets of spreading sequences includes an element for counting and for forming an address and a table containing L sets of S sequences. The address contains q+log2S bits. The q bits are used for selecting one set among L (L=2q) sets. The log2S bits are used for selecting one sequence among the S sequences in the set.
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.
Abstract:
A generator of repetitive sets of spreading sequences comprising means (20) for counting and for forming an address and a table (30) containing L sets of S sequences, wherein the address contains q+log2S bits, wherein the q bits are used for selecting one set among L (L=2q) sets and wherein the log2S bits are used for selecting one sequence among the S sequences in the set.