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  • #587

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Opened Aug 19, 2019 by Mauro Viturro@MViturro

DerivativeStructures derivatives diverge for low altitudes (drag + srp)

Resulting from this discussion. Derivatives of the PV variables with respect to their initial values, when obtained through a PartialDifferentialEquations object vastly differ from those obtained using DerivativeStructures objects (the latter diverge) when conditions are as follows:

  • Low altitude (6550km initial altitude, nearly 0 eccentricity).
  • Drag force with a HarrisPriester atmosphere model is on. (- SolarRadiationPressure force model is also on, but divergence is also there without it.)
  • The integrators used for both computations are DormandPrince853 both in field and non-field versions.

This small piece of code can be used as a quick reference for identifying the problem.

FieldBugTest.java

Edited Aug 19, 2019 by Mauro Viturro
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Reference: orekit/orekit#587