Seatex AIS 100 Instruction Manual, rev. 5
General information
4
Figure 1 Elements in an AIS system
The system broadcasts data using the SOTDMA (Self-organised Time
Division Multiple Access) data protocol. Each minute is divided into
4500 time slots, enabling simultaneous transmission of up to 500
stations.
Coverage
The system radio coverage range is similar to other VHF applications
and is dependent on the height of the antenna. The propagation differs
from that of a radar, due to the longer wavelength, so it is possible to
"see" around bends and behind islands if the landmasses are not too
high. A typical value to be expected at sea is 20 nautical miles.
AIS Base Station
VTS Centre
GNSS Satellites
AIS VHF Link
AIS VHF Link
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