Communication system synchronisation method for high speed frequency hopping systems

摘要

The method involves integrating a call sequence using a number of windows of different durations. A first sliding frequency window is short and has a number of monitoring levels which give a coarse synchronisation when the sum of integrated values exceeds a first threshold. This sets off a verification phase on a fixed short duration window which looks for an integration sum passing a second threshold to determine synchronisation. At the same time, another larger sliding frequency window comprising more levels is integrated to another threshold. The verification phase interrupts the integration and when the second threshold is not reached, the values leading to the passing of the first threshold are deleted before the first window slides.