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  • #351

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Opened Aug 07, 2018 by Evan Ward@evanward1Developer

PartialDerivativesEquations does not work with non-Cartesian elements

Using PDE with the propagator's orbitType set to a non-Cartesian value does not produce meaningful results. See the discussion on the dev list: https://www.orekit.org/wws/arc/orekit-developers/2017-08/msg00010.html

One workaround is to compute the STM in Cartesian elements and then transform it to the desired element set using equation 7.32 in Montenbruck & Gill:
```
STM (Keplerian) = d(kep)/d(cart) * STM (Cartesian) * ( d(kep)/d(cart) )^-1
```

Another workaround is to use a FieldNumericalPropagator with the orbitType set to the desired value, and then extract the STM from the final orbital elements.

(from redmine: issue id 351, created on 2017-08-11)

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Reference: orekit/orekit#351