Re: [Orekit Users] Instantiating TLEPropagator Fails

[MAISONOBE Luc <luc.maisonobe@c-s.fr>]

michael.corvin@kinetx.com a écrit :

> Hi!

Hi Michael,

> First, compliments to the team on a very, very well architected  
> library!  I am

Thank a lot for these kind words.

> just exploring how to use it, instantiating the objects within Matlab.  I've
> been using the Keplerian propagator successfully, but can't  
> understand why I'm
> getting the following error when trying to instantiate a TLEPropagator:
>
> code fragment:
>
> %% ITRF Earth Frame
> ITRF = FramesFactory.getITRF2008()
> earth = OneAxisEllipsoid(const.re, const.flattening, ITRF)
>
> %% ISS current TLE from Celestrak
> tleLine = ...
>     {'1 25544U 98067A   14066.59481438  .00023344  00000-0  39858-3 0  8248'
>     '2 25544  51.6482 243.1693 0003329 216.1098 255.4889 15.51194691875564'}
> issTLE = TLE(tleLine{1},tleLine{2})
>
> issMass = 500000.0; % kg
>
> %% Attitude provider
> issAttitude = BodyCenterPointing(ITRF)
>
> %% TLE Propagator
> issPropagator = TLEPropagator(issTLE, issAttitude, issMass)
>
> All of the objects get created ok up to the issPropagator, which throws:
>
> "No constructor 'org.orekit.propagation.analytical.tle.TLEPropagator' with
> matching signature found."
>
> issTLE is of class TLE,
> issAttitude is of class BodyCenterPointing < implements AttitudeProvider
> issMass is of class double
>
> ( I did try passing java.lang.Double(issMass) to be certain it's passed as a
> java double, but that should be happening anyway the way Matlab  
> invokes Java?)
>
> According to the Java doc and looking at the source for TLEPropagator that
> should work?  Or what am I missing?

The constructor you try to use is protected, so U guess the error is  
due to access restrictions. Instead of calling it, you should use the  
static factory method

TLEPropagator selectExtrapolator(tle, attitudeProvider,mass)

best regards,
Luc

> Merci beaucoup et salutations de l'Arizona!



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