Synchronization method and system
AssigneeThales
InventorsMarc Touret, Thierry Menigand, Marc Coutolleau
Life of this patent
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Abstract
A method of emission of a frequency synchronization signal comprises a first step of determining at least two first emission frequencies respectively associated with at least two first intervals separated temporally by a first duration. The first temporal intervals are of identical duration. The first durations are identical for identical first frequencies and the first durations are different for different first frequencies. The method also comprises a second step of emitting at least one synchronization signal in the first temporal intervals and by using the first frequency, the signal emitted in the first intervals being identical.
Claims4
A method for receiving a synchronization signal transmitted by a radio transmitter using at least two different first frequencies, each of the at least two first frequencies being within a corresponding one of at least two first temporal intervals separated by a different respective first duration, said first temporal intervals being of identical length, said first durations have a different length for each of said at least two different first frequencies, the method comprising:
- a first step of, using a radio receiver, receiving and demodulating the synchronization signal, said demodulation being carried out using a locally generated second frequency;
- a second step of, using the radio receiver, determining:
- (1) at least two second temporal intervals in which an energy of the demodulated synchronization signal is at a maximum, and (2) at least one second duration separating the at least two second temporal intervals;
- the second step further including comparing the at least one second duration and said first durations in order to determine at least one gap between at least one of the first frequencies and said second frequency;
- and
- a third step of synchronizing the radio receiver to the synchronization signal using said at least one gap.
A synchronization method of a communication system, the method comprising:
- determining, by at least one radio transmitter, at least two different first frequencies, each of the at least two first frequencies being within a corresponding one of at least two first temporal intervals separated by a different respective first duration, said first temporal intervals being of identical length, said first durations have a different length for each of said at least two different first frequencies;
- transmitting, by the at least one radio transmitter, a synchronization signal comprising the at least two different first frequencies in the corresponding at least two first temporal intervals and said first durations;
- receiving and demodulating, by at least one satellite terminal, the synchronization signal, said demodulation being carried out using a locally generated second frequency;
- determining, by the at least one satellite terminal, at least two second temporal intervals in which an energy of the demodulated synchronization signal is at a maximum, and determining at least one second duration separating the at least two second temporal intervals;
- comparing, by the at least one satellite terminal, the at least one second duration and said first durations in order to determine at least one gap between at least one of the first frequencies and said second frequency;
- and
- synchronizing the at least one satellite terminal to the synchronization signal using said at least one gap,
- wherein the at least one radio transmitter includes at least one of the following:
- a terrestrial station, and a satellite.
Dependencies are inferred from the claim text.