/**
* load orekit data and gravity field.
*
* @throws Exception on error.
*/
@BeforeClass
public static void setUpBefore() throws Exception {
Utils.setDataRoot("earth:geoid:regular-data");
GravityFieldFactory.clearPotentialCoefficientsReaders();
GravityFieldFactory.addPotentialCoefficientsReader(new EGMFormatReader("egm96", false));
potential = GravityFieldFactory.getConstantNormalizedProvider(maxDegree, maxOrder);
}
@Before
public void setUp() throws OrekitException {
Utils.setDataRoot("regular-data:potential/shm-format");
GravityFieldFactory.addPotentialCoefficientsReader(
new SHMFormatReader("^eigen_cg03c_coef$", false));
mu = GravityFieldFactory.getUnnormalizedProvider(0, 0).getMu();
final Vector3D position = new Vector3D(7.0e6, 1.0e6, 4.0e6);
final Vector3D velocity = new Vector3D(-500.0, 8000.0, 1000.0);
initDate = AbsoluteDate.J2000_EPOCH;
final Orbit orbit =
new EquinoctialOrbit(
new PVCoordinates(position, velocity), FramesFactory.getEME2000(), initDate, mu);
initialState = new SpacecraftState(orbit);
double[][] tolerance = NumericalPropagator.tolerances(0.001, orbit, OrbitType.EQUINOCTIAL);
AdaptiveStepsizeIntegrator integrator =
new DormandPrince853Integrator(0.001, 200, tolerance[0], tolerance[1]);
integrator.setInitialStepSize(60);
propagator = new NumericalPropagator(integrator);
propagator.setInitialState(initialState);
}
@Before
public void setUp() throws OrekitException {
Utils.setDataRoot("regular-data:potential/shm-format");
GravityFieldFactory.addPotentialCoefficientsReader(
new SHMFormatReader("^eigen_cg03c_coef$", false));
}