1   /* Copyright 2002-2024 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.models.earth.weather.FieldPressureTemperatureHumidity;
24  import org.orekit.models.earth.weather.PressureTemperatureHumidity;
25  import org.orekit.time.AbsoluteDate;
26  import org.orekit.time.FieldAbsoluteDate;
27  import org.orekit.utils.FieldTrackingCoordinates;
28  import org.orekit.utils.TrackingCoordinates;
29  
30  /** Dummy mapping function.
31   * <p>
32   * This mapping function just uses 1.0 as constant mapping factors, which
33   * implies the slanted tropospheric delays are equal to the zenith delays.
34   * This is mainly useful when only zenith delays are needed.
35   * </p>
36   * @author Luc Maisonobe
37   * @since 12.1
38   */
39  public class DummyMappingFunction implements TroposphereMappingFunction {
40  
41      /** Builds a new instance.
42       */
43      protected DummyMappingFunction() {
44          // nothing to do
45      }
46  
47      /** {@inheritDoc} */
48      @Override
49      public double[] mappingFactors(final TrackingCoordinates trackingCoordinates, final GeodeticPoint point,
50                                     final PressureTemperatureHumidity weather,
51                                     final AbsoluteDate date) {
52          return new double[] {
53              1.0, 1.0
54          };
55      }
56  
57      /** {@inheritDoc} */
58      @Override
59      public <T extends CalculusFieldElement<T>> T[] mappingFactors(final FieldTrackingCoordinates<T> trackingCoordinates,
60                                                                    final FieldGeodeticPoint<T> point,
61                                                                    final FieldPressureTemperatureHumidity<T> weather,
62                                                                    final FieldAbsoluteDate<T> date) {
63          final T[] mapping = MathArrays.buildArray(date.getField(), 2);
64          mapping[0] = date.getField().getOne();
65          mapping[1] = date.getField().getOne();
66          return mapping;
67      }
68  
69  }