iSXblue/SXBlue II GNSS Series Technical Reference Manual
92
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5.3.2
$JGEO
This message is used to display information related to the current frequency of SBAS, and its location in
relation to the iSXBlue/SXBlue II GNSS antenna.
To query the iSXBlue/SXBlue II GNSS for the currently used SBAS satellite information, use the
following query:
$JGEO<CR><LF>
The receiver will respond with the following data message:
$>JGEO,Sent=1575.4200,Used=1575.4200,PRN=prn,Lon=lon,El=ele,Az=az
This message response is summarized in the following table:
Data Field
Description
$>JGEO
Message header.
Sent=1575.4200
Frequency (MHz) sent to the digital signal processor
Used=1575.4200
Frequency (MHz) currently used by the digital signal processor
PRN=prn
SBAS satellite PRN number
Lon=-lon
Longitude of the satellite
El=ele
Elevation angle from the iSXBlue/SXBlue II GNSS antenna to the
SBAS satellite, referenced to the horizon.
Az=az
Azimuth from the iSXBlue/SXBlue II GNSS antenna to the SBAS
satellite, referenced to the horizon.
To monitor this information for dual SBAS satellites, add the ‘,ALL’ variable to the $JGEO message as
follows:
$JGEO[,ALL] <CR><LF>
This will result in an output message similar to the following:
$>JGEO,Sent=1575.4200,Used=1575.4200,PRN=135,Lon=-133,El=9.7,Az=114.0
$>JGEO,Sent=1575.4200,Used=1575.4200,PRN=138,Lon=-107,El=5.0,Az=252.6
As can be seen from this output, the first message is identical to the output from the $JGEO query,
however, the second message provides information on the SBAS satellite not being currently used. Both
outputs follow the format in the previous table for the $JGEO query.
5.3.3
$JRD1
This command is used to request diagnostic information from the iSXBlue/SXBlue II GNSS.
To command the iSXBlue/SXBlue II GNSS to output the diagnostic information message for the
currently used SBAS satellites at a rate of 1 Hz, use the following query:
$JASC,D1,1[,OTHER]<CR><LF>
