Psrdiffsource Set The Pseudorange Correction Source - Novatel SPAN-SE User Manual

Commands
B.4.18 PSRDIFFSOURCE Set the pseudorange correction source
This command lets you identify from which base station to accept differential corrections. This is
useful when the receiver is receiving corrections from multiple base stations. See also the
RTKSOURCE command on Page 125.
 1. To use L-band differential corrections, an L-band receiver and a subscription to the
OmniSTAR, or use of the free CDGPS, service are required. Contact NovAtel for details, see
Page 18.
2. Since several errors affecting signal transmission are nearly the same for two receivers near
each other on the ground, a base at a known location can monitor the errors and generate
corrections for the rover to use. This method is called Differential GPS, and is used by
surveyors to obtain millimeter accuracy. Major factors degrading GPS signals, which can be
removed or reduced with differential methods, are the atmosphere, ionosphere, satellite orbit
errors and satellite clock errors. Errors not removed include receiver noise and multipath.
Abbreviated ASCII Syntax:
PSRDIFFSOURCE type ID
Factory Default:
psrdiffsource auto "any"
Abbreviated ASCII Examples:
1.
2.
3.
SPAN-SE User Manual Rev 1
Select only SBAS:
RTKSOURCE NONE
PSRDIFFSOURCE SBAS
SBASCONTROL ENABLE AUTO
Enable OmniSTAR VBS, and HP or XP:
RTKSOURCE OMNISTAR
PSRDIFFSOURCE OMNISTAR
Enable RTK and PSRDIFF from RTCM, with a fall-back to SBAS:
RTKSOURCE RTCM ANY
PSRDIFFSOURCE RTCM ANY
SBASCONTROL ENABLE AUTO
Message ID: 493
Appendix B
119