RelativisticClockPhaseModifier.java
/* Copyright 2002-2022 CS GROUP
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*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
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package org.orekit.estimation.measurements.modifiers;
import java.util.Collections;
import java.util.List;
import org.orekit.estimation.measurements.EstimatedMeasurement;
import org.orekit.estimation.measurements.EstimationModifier;
import org.orekit.estimation.measurements.gnss.Phase;
import org.orekit.utils.Constants;
import org.orekit.utils.ParameterDriver;
/** Class modifying theoretical phase measurement with relativistic clock correction.
* <p>
* Relativistic clock correction is caused by the motion of the satellite as well as
* the change in the gravitational potential
* </p>
* @author Bryan Cazabonne
* @since 10.3
*
* @see "Teunissen, Peter, and Oliver Montenbruck, eds. Springer handbook of global navigation
* satellite systems. Chapter 19.2. Springer, 2017."
*/
public class RelativisticClockPhaseModifier extends AbstractRelativisticClockModifier implements EstimationModifier<Phase> {
/** Simple constructor. */
public RelativisticClockPhaseModifier() {
super();
}
/** {@inheritDoc} */
@Override
public List<ParameterDriver> getParametersDrivers() {
return Collections.emptyList();
}
/** {@inheritDoc} */
@Override
public void modify(final EstimatedMeasurement<Phase> estimated) {
// Relativistic clock correction
final double dtRel = relativisticCorrection(estimated);
// Wavelength
final double wavelength = estimated.getObservedMeasurement().getWavelength();
// Update estimated value taking into account the relativistic effect.
final double cOverLambda = Constants.SPEED_OF_LIGHT / wavelength;
final double[] newValue = estimated.getEstimatedValue().clone();
newValue[0] = newValue[0] - dtRel * cOverLambda;
estimated.setEstimatedValue(newValue);
}
}