A method for validating the synchronization between a geolocation receiver and a transmitting satellite during a phase for acquiring a navigation signal from this satellite, said 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, and to implement a phase for acquiring a navigation signal for each of the transmitting satellites, in which the receiver determines a satellite transmitting a corresponding navigation signal in a synchronization step, each transmitting satellite further transmitting sets of ephemerids made up of a plurality of words, each having an associated rank, encoding information relative to said transmitting satellite and making it possible to compute the position of said transmitting satellite in a given plane of reference, the method being implemented by said receiver, wherein the method comprises: for each identified transmitting satellite, performing a validation test, comprising: - extracting (26, 42) ephemerid words from the navigation signal associated with the transmitting satellite identified in the acquisition phase, as said navigation signal is received, - comparing (30, 50) at least part of said extracted ephemerid words to at least one stored ephemerid word with the same rank for said identified transmitting satellite and/or for at least one of the other transmitting satellites, and based on the result of the comparison, verifying a synchronization validation condition (32-34, 52-56) validating the synchronization with said identified transmitting satellite, with a predetermined false alarm probability and/or non-detection probability, the false alarm designating a false detection of a cross-correlation, the non-detection designating a non-detection of cross-correlation, the probability of non-detection being estimated as a function of the probability that at least one ephemerid word of same rank is identical in the ephemerids transmitted for two or more distinct satellites, or the probability that said ephemerid word received by said transmitting satellite is identical to a word received for another satellite, and in case of positive verification, stop the validation test, in case of negative verification, return to the extracting step. said 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, and to implement a phase for acquiring a navigation signal for each of the transmitting satellites, in which the receiver determines a satellite transmitting a corresponding navigation signal in a synchronization step, each transmitting satellite further transmitting sets of ephemerids made up of a plurality of words, each having an associated rank, encoding information relative to said transmitting satellite and making it possible to compute the position of said transmitting satellite in a given plane of reference, the method being implemented by said receiver, wherein the method comprises: for each identified transmitting satellite, performing a validation test, comprising: - extracting (26, 42) ephemerid words from the navigation signal associated with the transmitting satellite identified in the acquisition phase, as said navigation signal is received, - comparing (30, 50) at least part of said extracted ephemerid words to at least one stored ephemerid word with the same rank for said identified transmitting satellite and/or for at least one of the other transmitting satellites, and - extracting (26, 42) ephemerid words from the navigation signal associated with the transmitting satellite identified in the acquisition phase, as said navigation signal is received, - comparing (30, 50) at least part of said extracted ephemerid words to at least one stored ephemerid word with the same rank for said identified transmitting satellite and/or for at least one of the other transmitting satellites, and based on the result of the comparison, verifying a synchronization validation condition (32-34, 52-56) validating the synchronization with said identified transmitting satellite, with a predetermined false alarm probability and/or non-detection probability, the false alarm designating a false detection of a cross-correlation, the non-detection designating a non-detection of cross-correlation, the probability of non-detection being estimated as a function of the probability that at least one ephemerid word of same rank is identical in the ephemerids transmitted for two or more distinct satellites, or the probability that said ephemerid word received by said transmitting satellite is identical to a word received for another satellite, and the probability that at least one ephemerid word of same rank is identical in the ephemerids transmitted for two or more distinct satellites, or the probability that said ephemerid word received by said transmitting satellite is identical to a word received for another satellite, and in case of positive verification, stop the validation test, in case of negative verification, return to the extracting step.