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  /** Chao mapping function for radio wavelengths.
20   * <p>
21   * The mapping function is described in A. Estefan, O. J. Sovers 1994 paper
22   * "A Comparative Survey of Current and Proposed Tropospheric Refraction-Delay
23   * Models for DSN Radio Metric Data Calibration"
24   * </p>
25   * @author Luc Maisonobe
26   * @since 12.1
27   */
28  public class RevisedChaoMappingFunction extends AbstractChaoMappingFunction {
29  
30      /** First coefficient for hydrostatic (dry) component. */
31      private static final double AD = 0.00147;
32  
33      /** Second coefficient for hydrostatic (dry) component. */
34      private static final double BD = 0.0400;
35  
36      /** First coefficient for wet component. */
37      private static final double AW = 0.00035;
38  
39      /** Second coefficient for wet component. */
40      private static final double BW = 0.017;
41  
42      /** Builds a new instance.
43       */
44      public RevisedChaoMappingFunction() {
45          super(AD, BD, AW, BW);
46      }
47  
48  }