What is STDMA / SOTDMA Technology of AIS?

STDMA (Self Organized Time Division Multiple Access) technique ensures that report from one AIS station fits into one of 2250 time slots of 26.6 milliseconds established every 60 seconds on each frequency. Synchronization between all the AIS users in the area is essential to avoid overlap of transmissions. This needs some very accurate time management which is provided by the GPS system.

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