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Course Drift using GPS+Wheel Encoder (EKF3)

Hi,
I noticed a certain drift when I gave an auto-mission to my Rover operating on AR3.4.2 using GPS+Wheel Encoder at the same time with EKF3 enabled.

In the starting I got good results but each time when in last row the rover drifts from its actual path and take a leap. Why is this happening just for a single row or in the last rows? Is there any parameter to tune or any related setting to change.

I’m attaching logs, please help me with it.

Logs

Servers by jDrones