OnBoardAntennaInterSatellitesPhaseModifier.java

/* Copyright 2002-2025 CS GROUP
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 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * CS licenses this file to You under the Apache License, Version 2.0
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 *
 *   http://www.apache.org/licenses/LICENSE-2.0
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package org.orekit.estimation.measurements.modifiers;

import java.util.Collections;
import java.util.List;

import org.hipparchus.geometry.euclidean.threed.Vector3D;
import org.orekit.estimation.measurements.EstimatedMeasurementBase;
import org.orekit.estimation.measurements.EstimationModifier;
import org.orekit.estimation.measurements.gnss.InterSatellitesPhase;
import org.orekit.gnss.antenna.FrequencyPattern;
import org.orekit.utils.ParameterDriver;

/** On-board antenna offset effect on inter-satellites phase measurements.
 * @author Bryan Cazabonne
 * @since 10.3
 */
public class OnBoardAntennaInterSatellitesPhaseModifier
    extends PhaseCentersInterSatellitesBaseModifier<InterSatellitesPhase>
    implements EstimationModifier<InterSatellitesPhase> {

    /** Simple constructor.
     * @param receiverPhaseCenter position of the Antenna Phase Center in  receiver satellite frame
     * @param emitterPhaseCenter  position of the Antenna Phase Center in emitter satellite frame
     */
    public OnBoardAntennaInterSatellitesPhaseModifier(final Vector3D receiverPhaseCenter,
                                                      final Vector3D emitterPhaseCenter) {
        this(new FrequencyPattern(receiverPhaseCenter, null),
             new FrequencyPattern(emitterPhaseCenter, null));
    }

    /** Simple constructor.
     * @param receiverPattern pattern for receiver satellite
     * @param emitterPattern  pattern for emitter satellite
     * @since 12.1
     */
    public OnBoardAntennaInterSatellitesPhaseModifier(final FrequencyPattern receiverPattern,
                                                      final FrequencyPattern emitterPattern) {
        super(receiverPattern, emitterPattern);
    }

    /** {@inheritDoc} */
    @Override
    public List<ParameterDriver> getParametersDrivers() {
        return Collections.emptyList();
    }

    @Override
    public void modifyWithoutDerivatives(final EstimatedMeasurementBase<InterSatellitesPhase> estimated) {
        estimated.modifyEstimatedValue(this,
                                       estimated.getEstimatedValue()[0] +
                                       oneWayDistanceModification(estimated) /
                                       estimated.getObservedMeasurement().getWavelength());
    }

}