NavCom SF-2050 Rev.D - Manual (Page 48)

SF-2050 User Guide - Rev. D
which switch automatically or in response to a remote
control signal from the Processing Centers. The data
links from the
reference stations use the Internet as the
primary data link and are backed up by dedicated
communications lines, but in fact the network is
sufficiently dense that the
reference stations effectively
act as back up for each other. If one or several fail, the
net effect on the correction accuracy is not impaired.
There are two continuously running Processing Centers,
each receiving all of the reference site inputs and each
with redundant communications links to the uplink
Land Earth Stations ( LES ). The Land Earth Stations are
equipped with two complete and continuously
operating sets of uplink equipment arbitrated by an
automatic fail over switch. Finally, a comprehensive
team of support engineers maintains round the clock
monitoring and control of the system.
The network is a fully automated self-monitoring
system. To ensure overall system integrity, an
independent integrity monitor receiver, similar to a
standard
StarFire
™ user receiver, is installed at every
reference station to monitor service quality. Data from
these integrity monitors is sent to the two independent
processing hubs in Torrance, California and Moline,
Illinois. Through these integrity monitors the network is
continuously checked for overall
SBAS positioning
accuracy, L-Band signal strength, data integrity and
other essential operational parameters.
How to Access the StarFire
™ Service
StarFire
™ is a subscription service. The user pays a
subscription, which licenses the use of the service for a
predetermined period of time.
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