iSXblue/SXBlue II GNSS Series Technical Reference Manual
104
$>JRAD,1,51.00233513,-114.08232345,1050.212
Upon startup of the iSXBlue/SXBlue II GNSS with the Auto-Dif application running (as opposed to the
SBAS application), no reference position will be present in memory. If you attempt to query for the
reference position, the iSXBlue/SXBlue II GNSS will respond with the following message:
$>JRAD,1,FAILED,Present Location Not Stable
5.6.2
$JRAD,1,P
This command records the current position as the reference with which to compute Auto-Dif corrections.
This would be used in relative mode, as no absolute point information is specified. The $JRAD,2
command will need to be issued after this command.
This command has the following format:
$JRAD,1,P<CR><LF>
The iSXBlue/SXBlue II GNSS will reply with the following response:
$>JRAD,1P,OK
5.6.3
$JRAD,1,lat,lon,alt
This command is a derivative of the $JRAD,1,P command and is used when absolute positioning is desired.
The $JRAD,2 command will need to be issued after this command.
This command has the following layout:
$JRAD,1,lat,lon,alt<CR><LF>
Where the data fields in this command are described in the following table.
Data Field
Description
lat
This is the latitude of the reference point in degrees decimal degrees.
lon
This is the longitude of the reference point in degrees decimal degrees.
alt
This is the ellipsoidal height of the reference point in m. (Ellipsoidal height can
be calculated by adding the altitude and geoidal separation, both available from
the GGA sentence. See example below.)
Example of ellipsoidal height calculation:
$GPGGA,173309.00,5101.04028,N,11402.38289,W,2,07,1.4,1071.0,M,-17.8,M,6.0, 0122*48
(and ellipsoidal height = 1071.0 + (-17.8) = 1053.2 meters)
The iSXBlue/SXBlue II GNSS will reply with the following response:
$>JRAD,lat,lon,alt
