C94-M8P - User Guide
UBX-15031066 - R06
Advance Information
Getting
started
Page 11 of 29
Base radio link
The radio link needs to be configured on the Base. Use the UBX-CFG-PRT message to set “Protocol in” to
“none”, as shown in Figure 3.
Figure 3: Configuring Base radio link
Base station operation
When the NEO-M8P functions as a Base Station, the receiver uses measurements from all available satellites to
broadcast corrections. By sending the UBX-CFG-TMODE3 message
,
the Base Station can be configured to
operate in a Fixed position mode or to self Survey-in its position, depending on the user’s knowledge of the Base
Station’s antenna reference position.
The Base Station must be configured with a Fixed position or have completed a Survey-in operation before it
will be able to output the RTCM reference station position message needed by the Rover.
The current firmware requires five ambiguities to attempt fixing. The RTK fixed status can therefore be
reached when either of the following requirements is fulfilled: 1) six satellites from a single constellation are
available, or 2) eight satellites from two different constellations are available.
Disable NMEA (disable child messages) in u-center to see TIME mode displayed in u-center.
Fixed position mode
In Fixed position mode, specify the Base Station’s antenna reference point with ECEF or Lat/Lon/Alt coordinates.
The corresponding fields are available via u-center, as shown in Figure 4. The coordinates can be specified with
0.1 mm resolution. For more information, see the
Protocol Specification Addendum for HPG1.30 [5].
The accuracy of the specified coordinates will reflect directly in the absolute accuracy of the Rover’s position.
Figure 4: Configure to Fixed Position Mode for a Base Station
