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 java.util.Collections;
20  import java.util.List;
21  
22  import org.hipparchus.CalculusFieldElement;
23  import org.orekit.bodies.FieldGeodeticPoint;
24  import org.orekit.bodies.GeodeticPoint;
25  import org.orekit.models.earth.weather.FieldPressureTemperatureHumidity;
26  import org.orekit.models.earth.weather.PressureTemperatureHumidity;
27  import org.orekit.time.AbsoluteDate;
28  import org.orekit.time.FieldAbsoluteDate;
29  import org.orekit.utils.FieldTrackingCoordinates;
30  import org.orekit.utils.ParameterDriver;
31  import org.orekit.utils.TrackingCoordinates;
32  
33  /** Defines a constant tropospheric model.
34   * @author Luc Maisonobe
35   * @since 12.1
36   */
37  public class ConstantTroposphericModel implements TroposphericModel {
38  
39      /** Constant delay. */
40      private final TroposphericDelay delay;
41  
42      /** Simple constructor.
43       * @param delay constant delay
44       */
45      public ConstantTroposphericModel(final TroposphericDelay delay) {
46          this.delay = delay;
47      }
48  
49      /** {@inheritDoc} */
50      @Override
51      public TroposphericDelay pathDelay(final TrackingCoordinates trackingCoordinates,
52                                         final GeodeticPoint point,
53                                         final PressureTemperatureHumidity weather,
54                                         final double[] parameters,
55                                         final AbsoluteDate date) {
56          return delay;
57      }
58  
59      /** {@inheritDoc} */
60      @Override
61      public <T extends CalculusFieldElement<T>> FieldTroposphericDelay<T> pathDelay(final FieldTrackingCoordinates<T> trackingCoordinates,
62                                                                                     final FieldGeodeticPoint<T> point,
63                                                                                     final FieldPressureTemperatureHumidity<T> weather,
64                                                                                     final T[] parameters,
65                                                                                     final FieldAbsoluteDate<T> date) {
66          final T zero = date.getField().getZero();
67          return new FieldTroposphericDelay<>(zero.newInstance(delay.getZh()),
68                                              zero.newInstance(delay.getZw()),
69                                              zero.newInstance(delay.getSh()),
70                                              zero.newInstance(delay.getSw()));
71      }
72  
73      /** {@inheritDoc} */
74      @Override
75      public List<ParameterDriver> getParametersDrivers() {
76          return Collections.emptyList();
77      }
78  
79  }