Abstract: A method and a function for checking the integrity of the processing of a radionavigation signal emitted by a satellite, the signal being received by a receiver comprising reception means and processing means, the processing means comprising a linear anti-interference filter, the integrity checking method comprising at least a first phase of detection of a risk of false lock-on comprising the following steps: a step of recovery of a nominal theoretical self-correlation function of the received signal not processed by the linear anti-interference filter; a step of determination of a mean theoretical self-correlation function of the signal received and processed by the linear anti-interference filter over a defined integration period; a step of determination of the number of local maxima of the modulus or of the modulus squared of the mean theoretical self-correlation function, a risk of false lock-on being detected if the number of local maxima is greater than or equal to two.

Abstract: A method and a function for checking the integrity of the processing of a radionavigation signal emitted by a satellite, the signal being received by a receiver comprising reception means and processing means, the processing means comprising a linear anti-interference filter, the integrity checking method comprising at least a first phase of detection of a risk of false lock-on comprising the following steps: a step of recovery of a nominal theoretical self-correlation function of the received signal not processed by the linear anti-interference filter; a step of determination of a mean theoretical self-correlation function of the signal received and processed by the linear anti-interference filter over a defined integration period; a step of determination of the number of local maxima of the modulus or of the modulus squared of the mean theoretical self-correlation function, a risk of false lock-on being detected if the number of local maxima is greater than or equal to two.

Abstract: A method between a geolocation receiver and an identified transmitting satellite, the receiver being able to receive a composite radio signal including a plurality of navigation signals each transmitted by a transmitting satellite that is part of a satellite constellation, a method for validating the synchronization between a geolocation receiver and a transmitting satellite during a phase for acquiring an augmentation signal including geolocation correction and integrity data; the methods include, for each identified transmitting satellite, extracting received ephemeris words or received words of any type of the received signal associated with the identified satellite as it is received, and comparing at least one received word with at least one word of the same rank or stored for the identified satellite and/or for at least one other satellite; the validation or non-validation of the synchronization with the identified transmitting satellite depends on a predetermined false alarm probability and/or non-detec

Abstract: The invention relates to a disruption detection method and device for a positioning measurement correction message of a satellite geolocation device, able to receive a composite radio signal including a plurality of signals each emitted by a satellite in view of the geolocation device, and a positioning measurement differential correction message (MC) emitted by a satellite geolocation precision augmentation system. The device (20) according to the invention includes modules (32) computing, for each of the satellites in view, at least one differential correction coherence metric depending on a positioning measurement differential correction (CAS) extracted from the received differential correction message (MC). The device (20) also includes a module (34) detecting a disruption of the correction message when the number of satellites for which the differential correction coherence metric is above a predetermined threshold exceeds a predetermined number of satellites (N0), strictly greater than one.

Abstract: A method between a geolocation receiver and an identified transmitting satellite, the receiver being able to receive a composite radio signal including a plurality of navigation signals each transmitted by a transmitting satellite that is part of a satellite constellation, a method for validating the synchronization between a geolocation receiver and a transmitting satellite during a phase for acquiring an augmentation signal including geolocation correction and integrity data; the methods include, for each identified transmitting satellite, extracting received ephemerid words or received words of any type of the received signal associated with the identified satellite as it is received, and comparing at least one received word with at least one word of the same rank or stored for the identified satellite and/or for at least one other satellite; the validation or non-validation of the synchronization with the identified transmitting satellite depends on a predetermined false alarm probability and/or non-detec

Abstract: Device for receiving radio-navigation signals, for aiding the piloting of an aircraft, comprising a first master GNSS module and a second slave GNSS module which are dissimilar, the first master GNSS module comprising a first means for processing radio-navigation signals and a first means for computing guidance data (Xg), the second slave GNSS module comprising a second means for processing radio-navigation signals and a second means for computing guidance data (Xg) on the basis of the measurements provided by the said second means for processing signals, each GNSS module furthermore comprising a comparison means for comparing between the outputs Xg1,Xg2 of the said first and second means for computing guidance data, suitable for executing the following integrity test: |Xg1?Xg2|>Kg·?{square root over (Variance(Xg1?Xg2))} and for inferring an integrity defect if the said integrity test is satisfied.

Abstract: The invention relates to a disruption detection method and device for a positioning measurement correction message of a satellite geolocation device, able to receive a composite radio signal including a plurality of signals each emitted by a satellite in view of the geolocation device, and a positioning measurement differential correction message (MC) emitted by a satellite geolocation precision augmentation system. The device (20) according to the invention includes modules (32) computing, for each of the satellites in view, at least one differential correction coherence metric depending on a positioning measurement differential correction (CAS) extracted from the received differential correction message (MC). The device (20) also includes a module (34) detecting a disruption of the correction message when the number of satellites for which the differential correction coherence metric is above a predetermined threshold exceeds a predetermined number of satellites (NO), strictly greater than one.

Abstract: The method of determination of the position of a mobile receiver using at least four satellites of which at least one first satellite transmits a first signal on one frequency, the broadcasting of the first signal being single-frequency, and of which at least one second satellite transmits second and third signals respectively on a first and a second frequency, the broadcasting of the signals being two-frequency, the receiver including means for reception of at least two frequencies, makes it possible to determine the position by a calculation of at least four pseudo-distances corresponding to the distances between each satellite and the receiver. The calculation of a pseudo-distance at the first frequency includes a step of estimation of the inter-frequency bias between the first and second frequencies.

Abstract: A multifrequency receiver comprises a first receiving subsystem comprising: means for receiving at least a first and a second distinct frequency at least one of which comprises a signal containing information relating to the position of a satellite, the said receiving means comprising: a first amplification stage delivering a first filtered signal based on the signal received by the receiver; a second stage for processing each of the received frequencies; a third stage comprising a mixer and at least one local oscillator; and a fourth amplification and filtering stage making it possible to amplify the filtered signal at the output of the mixer. The second stage comprises: a first switch; means for amplifying the signals of the two channels; and a second switch making it possible to deliver the signal to the third stage.

Abstract: The method of determination of the position of a mobile receiver using at least four satellites of which at least one first satellite transmits a first signal on one frequency, the broadcasting of the first signal being single-frequency, and of which at least one second satellite transmits second and third signals respectively on a first and a second frequency, the broadcasting of the signals being two-frequency, the receiver including means for reception of at least two frequencies, makes it possible to determine the position by a calculation of at least four pseudo-distances corresponding to the distances between each satellite and the receiver. The calculation of a pseudo-distance at the first frequency includes a step of estimation of the inter-frequency bias between the first and second frequencies.