Reduce noise in barometric sensor Pixhawk

Hi all, I am looking for means to enhance the accuracy while measuring altitude using Pixhawk 2.4.8, without using rangefinder etc. Is there any means I can increase the parameters in Mission Planner to reduce noise etc? Thank you in advance!

There are no magic software parameters that will improve the baro precision.
The software already does a best-effort approach.
But you can improve it using hardware changes, like making sure that it is protected from the props noise.