RangeIonosphericDelayModifier.java
/* Copyright 2002-2022 CS GROUP
* Licensed to CS GROUP (CS) under one or more
* 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
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.orekit.estimation.measurements.modifiers;
import org.orekit.attitudes.InertialProvider;
import org.orekit.estimation.measurements.EstimatedMeasurement;
import org.orekit.estimation.measurements.EstimationModifier;
import org.orekit.estimation.measurements.GroundStation;
import org.orekit.estimation.measurements.Range;
import org.orekit.models.earth.ionosphere.IonosphericModel;
import org.orekit.propagation.SpacecraftState;
/** Class modifying theoretical range measurement with ionospheric delay.
* The effect of ionospheric correction on the range is directly computed
* through the computation of the ionospheric delay.
*
* The ionospheric delay depends on the frequency of the signal (GNSS, VLBI, ...).
* For optical measurements (e.g. SLR), the ray is not affected by ionosphere charged particles.
* <p>
* Since 10.0, state derivatives and ionospheric parameters derivates are computed
* using automatic differentiation.
* </p>
* @author Maxime Journot
* @author Joris Olympio
* @since 8.0
*/
public class RangeIonosphericDelayModifier extends BaseRangeIonosphericDelayModifier implements EstimationModifier<Range> {
/** Constructor.
*
* @param model Ionospheric delay model appropriate for the current range measurement method.
* @param freq frequency of the signal in Hz
*/
public RangeIonosphericDelayModifier(final IonosphericModel model,
final double freq) {
super(model, freq);
}
/** {@inheritDoc} */
@Override
public void modify(final EstimatedMeasurement<Range> estimated) {
final Range measurement = estimated.getObservedMeasurement();
final GroundStation station = measurement.getStation();
final SpacecraftState state = estimated.getStates()[0];
RangeModifierUtil.modify(estimated, getIonoModel(),
new ModifierGradientConverter(state, 6, new InertialProvider(state.getFrame())),
station,
this::rangeErrorIonosphericModel,
this::rangeErrorIonosphericModel);
}
}