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.models.earth.displacement;
18  
19  import org.hipparchus.geometry.euclidean.threed.Vector3D;
20  import org.orekit.data.BodiesElements;
21  import org.orekit.frames.Frame;
22  import org.orekit.time.AbsoluteDate;
23  
24  /** Modeling of displacement of reference points due to plate tectonics.
25   * <p>
26   * Instances of this class are guaranteed to be immutable
27   * </p>
28   * @see org.orekit.estimation.measurements.GroundStation
29   * @see org.orekit.files.sinex
30   * @since 12.0
31   * @author Luc Maisonobe
32   */
33  public class TectonicsDisplacement implements StationDisplacement {
34  
35      /** Coordinates reference epoch. */
36      private AbsoluteDate epoch;
37  
38      /** Station velocity. */
39      private Vector3D velocity;
40  
41      /** Simple constructor.
42       * @param velocity station velocity in Earth frame (m/s)
43       * @param epoch coordinates reference epoch
44       */
45      public TectonicsDisplacement(final AbsoluteDate epoch, final Vector3D velocity) {
46          this.epoch    = epoch;
47          this.velocity = velocity;
48      }
49  
50      /** {@inheritDoc} */
51      @Override
52      public Vector3D displacement(final BodiesElements elements, final Frame earthFrame, final Vector3D referencePoint) {
53          return new Vector3D(elements.getDate().durationFrom(epoch), velocity);
54      }
55  
56  }
57