public Tracker(final BoundedPropagator prop) throws OrekitException {
this.prop = prop;
earth =
new OneAxisEllipsoid(
Constants.WGS84_EARTH_EQUATORIAL_RADIUS,
Constants.WGS84_EARTH_FLATTENING,
FramesFactory.getITRF2005());
// setup an arbitrary station on the surface of the earth
double longitude = Math.toRadians(45.);
double latitude = Math.toRadians(25.);
double altitude = 0.;
final GeodeticPoint station = new GeodeticPoint(latitude, longitude, altitude);
stationFrame = new TopocentricFrame(earth, station, "ground location");
}
