Self-Organized Time Division Multiple Access (STDMA) is a channel access method an invention by Håkan Lans based on time-division multiplexing.
The term Self-organising describes that VHF Data Link (VDL) Mode 4 uses a protocol, VDL Mode 4 Interface Protocol (VIP), that does not require a ground infrastructure because of the synchronisation to UTC. Time Division Multiple Access (TDMA) divides the VHF channel into frames, which furthermore is subdivided into a vast number of time slots. TDMA gives the opportunity for every station to use the whole bandwidth for the, with respect to time, non-overlapping signals. A challenge with this method is to take care of the time synchronisation. In VDL Mode 4 the time slots are synchronised to UTC and every slot is an opportunity for a station to transmit.
The system has been declared as the world standard for both marine- and aviation by the United Nations (IMO & ICAO) thus implementing a VHF Data Link.
IMO's Automatic Identification System is used for ships.
ICAO's 'VDL mode 4' is used by airplanes.
External links
- Self-Organized Time Division Multiple Access at the Open Directory Project
- GP&C Systems International AB
- Patent 5506587: Position Indicating System ("STDMA")
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