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Sudden Vertical Shifts/Jumps

Symptoms:

The elevations may suddenly and randomly jump (0.3 to 4m / 1 to 10ft), requiring going back and re-zeroing. This occurs at various times (minute to hours apart), but not predictably. RTK fix is sometimes dropped, but regained in 1-3 seconds, however, the elevations do not return to the original values. For smaller shifts in elevation, see Vertical Performance Issues (GPS drift).


When investigating in detail: In the GPS logs, these jumps only occur at the start of a new second when an RTK correction is applied. 


Possible Cause:

  • Base receiver has an intermittent failure.


Solutions:

  • Update the receiver software of the base and rover.
  • Swap the base receiver with a working receiver.
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