1   /* Copyright 2002-2025 CS GROUP
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 java.util.Collections;
20  import java.util.List;
21  
22  import org.orekit.estimation.measurements.EstimatedMeasurementBase;
23  import org.orekit.estimation.measurements.EstimationModifier;
24  import org.orekit.estimation.measurements.InterSatellitesRange;
25  import org.orekit.utils.ParameterDriver;
26  
27  /** Class modifying theoretical range measurement with Shapiro time delay.
28   * <p>
29   * Shapiro time delay is a relativistic effect due to gravity.
30   * </p>
31   *
32   * @author Luc Maisonobe
33   * @since 10.0
34   */
35  public class ShapiroInterSatelliteRangeModifier extends AbstractShapiroBaseModifier implements EstimationModifier<InterSatellitesRange> {
36  
37      /** Simple constructor.
38       * @param gm gravitational constant for main body in signal path vicinity.
39       */
40      public ShapiroInterSatelliteRangeModifier(final double gm) {
41          super(gm);
42      }
43  
44      /** {@inheritDoc} */
45      @Override
46      public List<ParameterDriver> getParametersDrivers() {
47          return Collections.emptyList();
48      }
49  
50      /** {@inheritDoc} */
51      @Override
52      public void modifyWithoutDerivatives(final EstimatedMeasurementBase<InterSatellitesRange> estimated) {
53          doModify(this, estimated);
54      }
55  
56  }