iSXblue/SXBlue II GNSS Series Technical Reference Manual
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4.
Differential Correction Operations
This section provides basic configuration steps for various modes of differential corrections.
4.1
Automatic Differential of the MFA Application
4.1.1
Principle of Operation
The Multi-Function Application is the software (firmware) that operates the iSXBlue/SXBlue II receivers.
The MFA automatically detects various sources and types of differential correction and uses the best one
available in the following order of priority:
-
RTK of the following formats (ROX, RTCM3, CMR/CMR+) on any of the communication ports.
Note that Glonass correctors are not used from the CMR+ format, even with the Glofix mode is
set to yes (see $JMODE command in Chapter 5). The SureTrack feature (see Section 2.5)
however will allow the use of the Glonass satellites in the solution after the GPS ambiguities are
solved.
-
OmniSTAR XP/HP/G2 (for SXBlue III-L models only)
-
DFX (single frequency proprietary RTK)
-
RTCM 2.x
-
OmniSTAR VBS
-
SBAS
While the iSXBlue/SXBlue II always tries to swap to the best source of differential correction available,
types can be excluded or included in this automatic detection process. The $JDIFFX,EXCLUDE or
$JDIFFX,INCLUDE commands can be used (refer to Chapter 5) to narrow the detection to only a few
types or prevent the receiver from switching to other types. Alternatively, the “RX Config” menu of the
SXBlue Config software offers the possibility to Include/Exclude the differential types.
It is recommended to keep EDIF activated as it is required for proper operation of the SureTrack and
GDif features (see section 2.5).
