LAND-PAK
™ User Guide – Rev. A
5-73
performance is dependent on, but not
limited to, location, satellite geometry,
atmospheric conditions (i.e., solar storm
activity), local interference, DoD signal
degradation (i.e., Selective Availability or
similar techniques), satellite messaging
or timing errors, and augmentation
correction messages. Equipment
operated on a single frequency is more
susceptible to atmospheric and solar
storm activity than is multi-frequency
operated equipment.
RTK Extend uses StarFire to provide
continuous RTK positioning during non-
reception of RTK corrections. When a
StarFire-enabled receiver with RTK
Extend falls out of RTK mode, the
system automatically transitions to RTK
Extend mode. Positioning is maintained
because of the close correlation in
phase measurement corrections
between RTK and StarFire.
Depending on how long the RTK base
station has been running and is StarFire-
fixed, the duration of RTK Extend is
limited to:
2 to 15 minutes for a NavCom
Technology base station
2 to 10 minutes for a non-NavCom
Technology base station
The correlation between RTK and
StarFire phase measurement
corrections decreases over time, until
the system automatically transitions out
of RTK Extend mode to the next
available dGPS mode.
Summary of Contents for LAND-PAK
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