Looking at the IsotropicDrag class for example, I see there is Field version of the acceleration, but not the constructors. So is the implementation of isotropic drag (same question for SRP actually) with the coefficient as a DerivativeStructure not exposed? It must be available indirectly though, as I assume that it is what is used by estimators e.g. the batch least squares to get partial derivatives w.r.t. parameters?
thanks for the link.
So from what I understand, I would need to create a Field class for SRP and/or drag enabling a coefficient as a DerivativeStructure.
But out of curiosity within Orekit’s least squares how are the partial derivatives of observations computed w.r.t. to the drag coefficient if part of the estimated parameters?