COBHAM Sailor 250 FleetBroadband, Training Manual, Page: 15 / 270

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SAILOR FleetBroadBand
Training Manual
1
BGAN-X Satellite Beam hierarchy and functions:
Figure 1-12: Beam hierarchy
1.2.5 Elevation bands
The observed performance or speed of the IP data connection is
infl uenced by many factors.
With the three different antenna sizes, of the three classes, the
achievable data rates will differ. Essentially, the larger the antenna
the greater the achievable bit rate, particularly in the uplink or
return direction. Larger antennas will also enable higher bit rates in
more demanding ‘edge of beam’ locations and will provide service
to lower elevation angles towards the satellite and in conditions of
high fading (e.g. calm water conditions (mirror effect)). In addition
the performance of the antenna in terms of gain, G/T and ability to
reject multipath will also affect the achievable bit rate.