AW: [Orekit Users] Propagating with Threads (Error)

Hi Evan,

Removing the static keyword fixed the issues, so it appears to be thread safe, should I still submit the bug?

Will submit bug for unit documentation and thanks for the additional advice!

Best regards,

Javier

Von: orekit-users-request@orekit.org [mailto:orekit-users-request@orekit.org] Im Auftrag von Ward, Evan
Gesendet: Freitag, 15. Juni 2018 16:21
An: orekit-users@orekit.org
Betreff: Re: [Orekit Users] Propagating with Threads (Error)

Hi Javier,

Don't share a Propagator between threads. I.e. make Satellite.propagator not static. Could you submit a bug to document that propagators are not thread-safe? It is currently documented for NumericalPropagator, but not TLEPropagator or Propagator. [1]

Altitude is in meters. Orekit uses m, s, rad, kg unless otherwise documented. Could you create a bug to document units there?

Patches are also welcome with the bugs if you would like to fix the issues.

Some other unsolicited advice. :) Use TLEPropagator.selectExtrapolator() instead of new SGP4(). [2] Use an ExecutorService [3] instead of Thread.

Best Regards,

Evan

[1] https://www.orekit.org/site-orekit-9.2/apidocs/org/orekit/propagation/numerical/NumericalPropagator.html

[2] https://www.orekit.org/site-orekit-9.2/apidocs/org/orekit/propagation/analytical/tle/TLEPropagator.html#selectExtrapolator-org.orekit.propagation.analytical.tle.TLE-org.orekit.attitudes.AttitudeProvider-double-

[3] https://docs.oracle.com/javase/7/docs/api/java/util/concurrent/ExecutorService.html

On Fri, 2018-06-15 at 15:22 +0200, javier.montemayor.mancias@emi.fraunhofer.de wrote:

Hi,

I'm trying to run several propagations in parallel using threads. However, I

get either a NullPointerException or an Orekit Exception "interval does not

bracket a root: f(0) = 0,01, f(60) = 0,042". I am using elevation detectors,

when I do not use them, the error does not happen.

Any ideas on how to make this right?

Here's the GitHub for the project:

https://github.com/jmontemayorm/Satellite_Orbit_Analyzer

Best regards,

Javier

P.S.: Does anybody know if the altitude argument for GeodeticPoint is in

meters or km?