NavCom SF-3050 Rev.I - Manual (Page 136)

SF-3050 GNSS Product User Guide – Rev I
A-117

The specifications herein are based on the following: PDOP <4, 1-sigma
(65%), 24-hour averaged set of data. Further, performance is dependent
upon, 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.

RTK WL is a positioning mode that is necessary for phase ambiguity
resolution. However when this navigation mode is indicated, it is likely that
the receiver is in a corner case navigation condition. As such, it is likely
that the end user will not wish to use it as a valid navigation mode.
If the above conditions are met, then the receiver will not need to be put into
RTK-WL mode.

RTK Extend is a purchased software option that 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 an NCT base station
2 to 15 minutes for a non-NCT base station
For RTK Extend to achieve maximum performance, the rover must be fully
converged, which typically requires one (1) hour of operation.
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.
This option is only required on the Rover receiver. If a Base receiver may be used
as a Rover at a future date, it should be optioned for RTK Extend as well.
Refer to the StarUtil 3000 User Guide, Chapter 5, for more information on RTK
Extend.
Pull-in Times
StarFire LP 10 minutes, typical
StarFire GPS 45 minutes, typical
StarFire GNSS 45 minutes, typical