Bug #351

PartialDerivativesEquations does not work with non-Cartesian elements

Added by Evan Ward 3 months ago.

Status:NewStart date:2017-08-11
Priority:NormalDue date:
Assignee:-% Done:

0%

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Target version:-

Description

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.

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