InterSatellitesWindUp.java

/* Copyright 2022-2025 Thales Alenia Space
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 *
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package org.orekit.estimation.measurements.gnss;

import org.hipparchus.geometry.euclidean.threed.Rotation;
import org.orekit.estimation.measurements.EstimatedMeasurementBase;

/** Modifier for wind-up effect in GNSS {@link InterSatellitesPhase inter-satellites phase measurements}.
 * @see InterSatellitesWindUpFactory
 * @author Luc Maisonobe
 * @since 12.0
 */
public class InterSatellitesWindUp extends AbstractWindUp<InterSatellitesPhase> {

    /** Simple constructor.
     * <p>
     * The constructor is package protected to enforce use of {@link WindUpFactory}
     * and preserve phase continuity for successive measurements involving the same
     * satellite/receiver pair.
     * </p>
     * @param emitter emitter dipole
     * @param receiver receiver dipole
     */
    InterSatellitesWindUp(final Dipole emitter, final Dipole receiver) {
        super(emitter, receiver);
    }

    /** {@inheritDoc} */
    @Override
    protected Rotation emitterToInert(final EstimatedMeasurementBase<InterSatellitesPhase> estimated) {
        // we don't use the basic yaw steering attitude model from ESA navipedia page
        // but rely on the attitude that was computed by the propagator, which takes
        // into account the proper noon and midnight turns for each satellite model
        return estimated.getStates()[1].toStaticTransform().getRotation().revert();
    }

    /** {@inheritDoc} */
    @Override
    protected Rotation receiverToInert(final EstimatedMeasurementBase<InterSatellitesPhase> estimated) {
        // we don't use the basic yaw steering attitude model from ESA navipedia page
        // but rely on the attitude that was computed by the propagator, which takes
        // into account the proper noon and midnight turns for each satellite model
        return estimated.getStates()[0].toStaticTransform().getRotation().revert();
    }

}