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.troposphere;
18  
19  import org.hipparchus.CalculusFieldElement;
20  import org.hipparchus.util.MathArrays;
21  import org.orekit.bodies.FieldGeodeticPoint;
22  import org.orekit.bodies.GeodeticPoint;
23  import org.orekit.time.AbsoluteDate;
24  import org.orekit.time.FieldAbsoluteDate;
25  import org.orekit.utils.FieldTrackingCoordinates;
26  import org.orekit.utils.TrackingCoordinates;
27  
28  /** Dummy mapping function.
29   * <p>
30   * This mapping function just uses 1.0 as constant mapping factors, which
31   * implies the slanted tropospheric delays are equal to the zenith delays.
32   * This is mainly useful when only zenith delays are needed.
33   * </p>
34   * @author Luc Maisonobe
35   * @since 12.1
36   */
37  public class DummyMappingFunction implements TroposphereMappingFunction {
38  
39      /** Builds a new instance.
40       */
41      protected DummyMappingFunction() {
42          // nothing to do
43      }
44  
45      /** {@inheritDoc} */
46      @Override
47      public double[] mappingFactors(final TrackingCoordinates trackingCoordinates, final GeodeticPoint point,
48                                     final AbsoluteDate date) {
49          return new double[] {
50              1.0, 1.0
51          };
52      }
53  
54      /** {@inheritDoc} */
55      @Override
56      public <T extends CalculusFieldElement<T>> T[] mappingFactors(final FieldTrackingCoordinates<T> trackingCoordinates,
57                                                                    final FieldGeodeticPoint<T> point,
58                                                                    final FieldAbsoluteDate<T> date) {
59          final T[] mapping = MathArrays.buildArray(date.getField(), 2);
60          mapping[0] = date.getField().getOne();
61          mapping[1] = date.getField().getOne();
62          return mapping;
63      }
64  
65  }