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Re: [Orekit Developers] Writing an OEM file after an ephemeris propagation
- To: "orekit-developers@orekit.org" <orekit-developers@orekit.org>
- Subject: Re: [Orekit Developers] Writing an OEM file after an ephemeris propagation
- From: "Ward, Evan" <Evan.Ward@nrl.navy.mil>
- Date: Wed, 8 Mar 2017 14:08:28 +0000
- Accept-language: en-US
- In-reply-to: <20170308102858.01C252887A@kepler.orekit.org>
- References: <20170308102858.01C252887A@kepler.orekit.org>
- Thread-index: AQHSl/bUP6qKs5ZtUEeZby0+oqxHtqGLTtCA
- Thread-topic: [Orekit Developers] Writing an OEM file after an ephemeris propagation
Hi Nicolas,On Wed, 2017-03-08 at 11:28 +0100, contact@nicolasrol.fr wrote:
> First of all, great job on OREKIT, it’s a really nice tool!
Welcome to the mailing list. We appreciate the feedback.
> Is this covariance matrix even available after a
> propagation ?
I think Hank answers your other question so I'll just try to answer
this one. The State Transition Matrix (STM) can be computed during
propagation. Take a look at [1] and [2]. Then you can use the STM and
your a priori covariance to compute the covariance at latter times.
Best Regards,
Evan
[1] https://www.orekit.org/forge/projects/orekit/wiki/Propagation#Propa
gating-both-equations-of-motions-and-additional-equations
[2] https://www.orekit.org/site-orekit-8.0/apidocs/org/orekit/propagati
on/numerical/PartialDerivativesEquations.html