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SPS (GPS, GLO, GAL BDS) a a
DGPS (GPS, GLO, GAL BDS) a a
SBAS x x
RTK (GPS, GLO, GAL BDS) a a
Note: only RTCM V3 format differential corrections are supported in gx/ix™ mode in real-time. RINEX and logged RTCM V3 are supported
in post process. For RTK, corrections for GPS are required, corrections for other constellations will be used if provided, GLONASS will be
used if it is detected as being compatible.
GNSS Recovery tab
The GNSS Recovery tab controls how the RT will accept or reject GNSS measurements. The RT will automatically
reject GNSS updates that it believes are not correct. However, there is a limit on the number of GNSS
measurements the RT will reject. Once this limit has passed the RT will accept the GNSS update since it is
possible the GNSS is correct and the inertial measurements are not. The GNSS control determines how long
the RT should wait before forcing the GNSS to be accepted. Both the velocity and the position can be controlled
separately.
In the default state the RT will reject up to 20 GNSS measurements before it forces the GNSS to be accepted.
However, in high multipath environments, and when wheel speed is used, it may be desirable to reject more
GNSS measurements. Select the ‘Start believing measurements after’ option and enter the number of GNSS
measurements to reject before the system starts believing it again.
The RT families have different GNSS receivers which have different update rates for position and velocity. Table
27 shows the update rates of the RTs.
Table 27: GNSS update rates
RT3000 v4 4 Hz 4 Hz 4 Hz 4 Hz
RT3000 T v4 4 Hz 10 Hz 4 Hz 4 Hz
Global Coordinate System tab
The RT can output position relative to different coordinate frames. You can change the coordinate frame
settings in the Global Coordinate System tab within Advanced Tools in NAVconfig, shown in Figure 42.
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