How do you combine multiple Ephemeris to get one Propagator that has all the PVCoordinates?

Orekit usage
2

Hi @matrix

Welcome to the Orekit forum :slight_smile:

I think you’re looking for an AggregateBoundedPropagator. It allows combining several BoundedPropagator from SP3 files into a single one.
You can find a topic about this class here: Interpolation over multiple SP3 files
In addition, the API documentation is available here: ORbit Extrapolation KIT 11.3.2 API

The method is:

  1. Create a OneAxisEllipsoid object. Example:
final BodyShape earth = new OneAxisEllipsoid(Constants.WGS84_EARTH_EQUATORIAL_RADIUS,
                                                     Constants.WGS84_EARTH_FLATTENING,
                                                     FramesFactory.getITRF(IERSConventions.IERS_2010, false));
  1. Use the earth.transform(Vector3D point, Frame frame, AbsoluteDate date) to get a GeodeticPoint object
  2. Access the Lat/Lon/Alt values with getLatitude(), getLongitude(), and getAltitude() methods of GeodeticPoint

Regards,
Bryan