1   /* Copyright 2022-2025 Thales Alenia Space
2    * Licensed to CS GROUP (CS) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * CS licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    *
9    *   http://www.apache.org/licenses/LICENSE-2.0
10   *
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  package org.orekit.estimation.measurements.modifiers;
18  
19  import org.orekit.estimation.measurements.EstimatedMeasurementBase;
20  import org.orekit.estimation.measurements.gnss.InterSatellitesOneWayRangeRate;
21  import org.orekit.propagation.SpacecraftState;
22  
23  /** Class modifying theoretical range-rate measurement with relativistic frequency deviation.
24   * <p>
25   * Relativistic clock correction is caused by the motion of the satellite as well as
26   * the change in the gravitational potential
27   * </p>
28   * @author Luc Maisonobe
29   * @since 12.1
30   *
31   * @see "Teunissen, Peter, and Oliver Montenbruck, eds. Springer handbook of global navigation
32   * satellite systems. Chapter 19.2. Springer, 2017."
33   */
34  public class RelativisticClockInterSatellitesOneWayRangeRateModifier
35      extends AbstractRelativisticClockOnBoardRangeRateModifier<InterSatellitesOneWayRangeRate> {
36  
37      /** Simple constructor.
38       * @param gm gravitational constant for main body in signal path vicinity.
39       */
40      public RelativisticClockInterSatellitesOneWayRangeRateModifier(final double gm) {
41          super(gm);
42      }
43  
44      /** {@inheritDoc} */
45      @Override
46      public void modifyWithoutDerivatives(final EstimatedMeasurementBase<InterSatellitesOneWayRangeRate> estimated) {
47          final SpacecraftState local  = estimated.getStates()[0];
48          final SpacecraftState remote = estimated.getStates()[1];
49          modifyWithoutDerivatives(estimated,
50                                   local.getOrbit().getA(), local.getPosition().getNorm(),
51                                   remote.getOrbit().getA(), remote.getPosition().getNorm());
52      }
53  
54  }