Use of Estimation Modifier

Orekit usage
1

Hey there,

Looking at the interface EstimationModifier, I do not see any Field or Gradient implementation required.
Does this mean that they are used only for the value of the residual of an OD iteration, and not in the derivative information for the update?

Cheers,
Romain.

2

Hi Romain,

The partial derivatives of the measurements with respect to estimated modifier’s parameters using Gradient are internally computed inside the modify method. You can for instance look at the class BaseRangeTroposphericDelayModifier.java which is extended by the RangeTroposphericDelayModifier.java.

Regards,
Bryan