EK2_ALT_M_NSE: Altitude measurement noise: Baro or GPS?

the description for “EK2_ALT_M_NSE: Altitude measurement noise”
Parameter List EK2_ALT_M_NSE

This is the RMS value of noise in the altitude measurement. Increasing it reduces the weighting of the baro measurement and will make the filter respond more slowly to baro measurement errors, but will make it more sensitive to GPS and accelerometer errors.

Does anyone know if it’s for sure always related to the baro sensor or is it possibly related to the sensor selected via
EK2_ALT_SOURCE: Primary altitude sensor source ?

Thanks for clarification

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