Methods and devices for validating the synchronization between a geolocalizing receptor and an emitting satellite

A method for validating the synchronization between a geolocation receiver and a transmitting satellite during a phase for acquiring an augmentation signal comprising geolocation correction and integrity data for a predetermined global navigation satellite system, the augmentation signal being provided by a service provider, the receiver receiving a plurality of augmentation signals coming from various transmitting satellites associated with at least one service provider, and implementing a phase for acquiring an augmentation signal for each of the transmitting satellites, in which the receiver identifies a satellite transmitting a corresponding augmentation signal, the method being implemented by the receiver and comprising, for each identified transmitting satellite, performing a validation test, comprising:

• extracting received words from the augmentation signal associated with the transmitting satellite identified in the acquisition phase, in the course of the reception of the augmentation signal;
• when a word is extracted:
• comparing the extracted word to at least one received word of the same type received for at least one of the other transmitting satellites;
• based on the result of said comparing, determining whether the navigation signal from which the words are extracted is transmitted by the identified transmitting satellite, with a predetermined false alarm probability and/or non-detection probability;
• in case said determining is affirmative:
• validating the synchronization;
• and
• stopping the validation test;
• and
• in case said determining is negative, returning to said extracting.

A geolocation receiver performing a synchronization with a transmitting satellite during a phase for acquiring a navigation signal from this satellite, the receiver receiving a composite radio signal comprising a plurality of navigation signals each transmitted by a transmitting satellite that is part of a satellite constellation, and implementing a phase for acquiring a navigation signal for each of the transmitting satellites, in which the receiver identifies a satellite transmitting a corresponding navigation signal, each transmitting satellite further transmitting sets of ephemerides comprised of a plurality of words, each having an associated rank, encoding information relative to the transmitting satellite and enabling computing the position of the transmitting satellite in a given plane of reference, the receiver comprising modules performing a validation test for each identified transmitting satellite, the modules comprising:

• a module for extracting each ephemeris word from the navigation signal associated with the transmitting satellite identified in the acquisition phase, in the course of reception of the navigation signal;
• a module for comparing the extracted ephemeris words to at least one stored ephemeris word with the same rank for the identified transmitting satellite and/or for at least one of the other transmitting satellites;
• and
• a module for validating or not validating the synchronization with the identified transmitting satellite, the module being programmed to based on the result of said module for comparing:
• determine whether the navigation signal from which the ephemeris words are extracted is transmitted by the identified transmitting satellite, with a predetermined false alarm probability and/or non-detection probability;
• in case of positive determination
• validate the synchronization;
• and
• stop the validation test;
• and
• in case of negative determination, return to said module for extracting.

A geolocation receiver validating the synchronization with a transmitting satellite during a phase for acquiring an augmentation signal comprising geolocation correction and integrity data for a predetermined global navigation satellite system, the augmentation signal being provided by a service provider, the receiver receiving a plurality of augmentation signals coming from various transmitting satellites associated with at least one service provider, and implementing a phase for acquiring an augmentation signal for each of the transmitting satellites, in which the receiver identifies a satellite transmitting a corresponding augmentation signal, the receiver comprising modules for performing a validation test for each identified transmitting satellite, the modules comprising:

• a module for extracting words from the augmentation signal associated with the transmitting satellite identified in the acquisition phase, in the course of reception of the augmentation signal;
• a module for comparing a each extracted word to at least one received word of the same type received for at least one of the other transmitting satellites;
• and
• a module for validating or not validating the synchronization, the module being programmed to, based on the result of the module for comparing, determine whether the navigation signal from which the words are extracted is transmitted by the identified transmitting satellite, with a predetermined false alarm probability and/or non-detection probability;
• in case of positive determination:
• validate the synchronization:
• and
• stop the validation test;
• and
• in case of negative determination, return to said module for extracting.