Commissariat &#xc0; L'&#xc9;nergie Atomique Et Aux &#xc9;nergies Alternatives

Commissariat a L'energie Atomique

Sébastien De Rivaz

François Dehmas

Florian Wolf

Laurent Ouvry

Manuel Pezzin

Mohamed Sana

Samuel Dubouloz

Mathieu Sambuq

The present invention relates to a method for estimating a distance between nodes of an LPWA network. First and second nodes, respectively, successively transmit a narrow band signal at a plurality of carrier frequencies to each other. The second and first nodes, respectively, receive the transmitted signals and demodulate them into baseband signals. Complex values representative of a forward-backward function of the transmission channel between two nodes are obtained from the baseband demodulated signals. These complex values are then provided to a previously supervisingly trained neural network, the neural network giving an estimation of the distance separating the first node and the second node. The present invention also relates to a method for estimating the position of a node in an LPWA network using the above-noted distance estimation method.

Distance estimation method in an LPWA network and a position estimation method associated therewith

A method for locating a connected object within an LPWA network using a plurality of base stations. The connected object transmits packets in RF frequency channels forming a virtual band being scanned once in the uplink direction and once in the downlink direction in a symmetrical manner. The base stations receiving the signal perform an RF to intermediate frequency translation and then a baseband translation in digital mode. The phase differences of arrival for each pair of base stations and the attenuation coefficients of each transmission channel between the connected object and each base station enable a composite transfer function to be constructed for each pair of base stations. The peaks of highest amplitude are detected in the corresponding impulse responses and the distance differences between the connected object and the different base stations are derived therefrom. The position of the object is then estimated by hyperbolic trilateration.

Method for locating a connected object by phase differences of arrival in an LPWA network

This method includes the steps of a) providing a tool configured to cooperated with each object in a cooperation position, the tool being equipped with a transmitter of a signal of Ultra-Wide Band type, b) arranging at least one receiver configured to provide data (X, X, X, X) representative of the corresponding cooperation position, and forming a random variable, noted X, c) acquiring at least M times the data (X, X, X, X) for each of the cooperation positions, where M is a natural number greater than a predetermined value, d) calculating the expectation of X, noted E[X], e) arranging the tool () in a current position, f) acquiring at least one current piece of data, provided by the at least one receiver for the current position, g) applying an identification criterion including E[X] to identify the current position from among the K cooperation positions.

Method of identifying positions of objects in an environment

A receiver of electromagnetic and a method for receiving electromagnetic signals transmitted in a frequency band having a predetermined upper limit fand representing a stream of information by means of a modulation of pulses at a predetermined average pulse repetition frequency f. The receiver includes an input stage including a band-pass filter and applys processing without changing frequency of the signals and a sampler of the processed signals operating at a sampling frequency fthat is an integer multiple of the average pulse repetition frequency fand less than said upper limit f.

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Villard-d'Héry, France

Sébastien De Rivaz