Examples with FieldOrbit org.orekit.orbits.FieldOrbit used on opensource projects

Example 1 with FieldOrbit

use of org.orekit.orbits.FieldOrbit in project Orekit by CS-SI.

the class FieldSpacecraftState method interpolate.

/**
 * Get an interpolated instance.
 * <p>
 * The additional states that are interpolated are the ones already present
 * in the instance. The sample instances must therefore have at least the same
 * additional states has the instance. They may have more additional states,
 * but the extra ones will be ignored.
 * </p>
 * <p>
 * As this implementation of interpolation is polynomial, it should be used only
 * with small samples (about 10-20 points) in order to avoid <a
 * href="http://en.wikipedia.org/wiki/Runge%27s_phenomenon">Runge's phenomenon</a>
 * and numerical problems (including NaN appearing).
 * </p>
 * @param date interpolation date
 * @param sample sample points on which interpolation should be done
 * @return a new instance, interpolated at specified date
 * @exception OrekitException if the number of point is too small for interpolating
 */
public FieldSpacecraftState<T> interpolate(final FieldAbsoluteDate<T> date, final Stream<FieldSpacecraftState<T>> sample) throws OrekitException {
    // prepare interpolators
    final List<FieldOrbit<T>> orbits = new ArrayList<>();
    final List<FieldAttitude<T>> attitudes = new ArrayList<>();
    final FieldHermiteInterpolator<T> massInterpolator = new FieldHermiteInterpolator<>();
    final Map<String, FieldHermiteInterpolator<T>> additionalInterpolators = new HashMap<String, FieldHermiteInterpolator<T>>(additional.size());
    for (final String name : additional.keySet()) {
        additionalInterpolators.put(name, new FieldHermiteInterpolator<>());
    }
    // extract sample data
    try {
        sample.forEach(state -> {
            try {
                final T deltaT = state.getDate().durationFrom(date);
                orbits.add(state.getOrbit());
                attitudes.add(state.getAttitude());
                final T[] mm = MathArrays.buildArray(orbit.getA().getField(), 1);
                mm[0] = state.getMass();
                massInterpolator.addSamplePoint(deltaT, mm);
                for (final Map.Entry<String, FieldHermiteInterpolator<T>> entry : additionalInterpolators.entrySet()) {
                    entry.getValue().addSamplePoint(deltaT, state.getAdditionalState(entry.getKey()));
                }
            } catch (OrekitException oe) {
                throw new OrekitExceptionWrapper(oe);
            }
        });
    } catch (OrekitExceptionWrapper oew) {
        throw oew.getException();
    }
    // perform interpolations
    final FieldOrbit<T> interpolatedOrbit = orbit.interpolate(date, orbits);
    final FieldAttitude<T> interpolatedAttitude = attitude.interpolate(date, attitudes);
    final T interpolatedMass = massInterpolator.value(orbit.getA().getField().getZero())[0];
    final Map<String, T[]> interpolatedAdditional;
    if (additional.isEmpty()) {
        interpolatedAdditional = null;
    } else {
        interpolatedAdditional = new HashMap<String, T[]>(additional.size());
        for (final Map.Entry<String, FieldHermiteInterpolator<T>> entry : additionalInterpolators.entrySet()) {
            interpolatedAdditional.put(entry.getKey(), entry.getValue().value(orbit.getA().getField().getZero()));
        }
    }
    // create the complete interpolated state
    return new FieldSpacecraftState<>(interpolatedOrbit, interpolatedAttitude, interpolatedMass, interpolatedAdditional);
}