Sps synchronization method

Details Sps synchronization method Sps synchronization method

H - Electricity

04

L

H04L 7/04 (2006.01) H04J 3/06 (2006.01)

Patent

CA 2240527

This invention refers to a synchronization method of a remote unit from a SPS timing signal (SPS) produced in a local unit. The SPS timing signal (SPS) is in the form of successive pulses (1) which are produced from signals received from satellites. The SPS signal (SPS) is asynchronous with respect to the system clock, that is, the reference clock defined between the local unit and the remote unit has no initial relationship with the SPS signal (SPS). The invention is characterized in that it includes the following steps: - calculation in the local unit of an information ("10011010") representing the number of local clock cycles occurring from the appearance of a pulse (1) until the moment (SL) when this information is injected into the data stream (FR); and - generation in the remote unit of a synchronization signal related to the SPS signal, depending on this information ("10011010").

Méthode de synchronisation d'une unité éloignée à partir d'un signal de temporisation SPS produit par une unité locale. Le signal de temporisation SPS prend la forme d'impulsions successives (1) produites à partir de signaux reçus de satellites. Le signal SPS est asynchrone par rapport à l'horloge du système, c'est-à-dire que l'horloge de référence définie pour l'unité locale et l'unité éloignée n'est pas initialement liée au signal SPS. La méthode comprend les étapes suivantes : calcul, dans l'unité locale, d'une information (« 10011010 ») représentant le nombre de cycles d'horloge locale à partir de l'apparition d'une impulsion (1) jusqu'au moment (SL) où cette information est injectée dans le train de données (FR); et production, dans l'unité éloignée, d'un signal de synchronisation lié au signal SPS, en fonction de ladite information (« 10011010 »).

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