Local calibration of GNSS

[ollesmaps]

Probably a naive idea:
Would that be possible to enhance the GNSS signal by very local mapper position info?
At many locations during the mapping day in the field (with Android device) I know exactly where I am - based on laser, aerial data.
And GNSS is a little or more off this location.

Would that be possible to add this very local "differential correction" to the triangulation?
Maybe just add a vector (my position minus GNSS)

• for the next 5-10 minutes and then come back to the GNSS
• or add a second differential localisation target (for the time a new button is pushed)

[ollesmaps]

My observation is: if there is a mistake in the GNSS, it is usually "parallel", at least for some time. The added vector would eliminate it.