1   /* Copyright 2002-2025 CS GROUP
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.files.rinex.navigation;
18  
19  import org.orekit.time.AbsoluteDate;
20  
21  /** Container for time system corrections.
22   * @author Bryan Cazabonne
23   * @since 12.0
24   */
25  public class TimeSystemCorrection {
26  
27      /** Time system correction type. */
28      private String timeSystemCorrectionType;
29  
30      /** A0 coefficient of linear polynomial for time system correction. */
31      private double timeSystemCorrectionA0;
32  
33      /** A1 coefficient of linear polynomial for time system correction. */
34      private double timeSystemCorrectionA1;
35  
36      /** Reference date for time system correction. */
37      private AbsoluteDate referenceDate;
38  
39      /**
40       * Constructor.
41       * @param timeSystemCorrectionType       time system correction type
42       * @param referenceDate                  reference date for time system correction
43       * @param timeSystemCorrectionA0         A0 coefficient of linear polynomial for time system correction
44       * @param timeSystemCorrectionA1         A1 coefficient of linear polynomial for time system correction
45       */
46      public TimeSystemCorrection(final String timeSystemCorrectionType,
47                                  final AbsoluteDate referenceDate,
48                                  final double timeSystemCorrectionA0,
49                                  final double timeSystemCorrectionA1) {
50          this.timeSystemCorrectionType = timeSystemCorrectionType;
51          this.referenceDate            = referenceDate;
52          this.timeSystemCorrectionA0   = timeSystemCorrectionA0;
53          this.timeSystemCorrectionA1   = timeSystemCorrectionA1;
54      }
55  
56      /**
57       * Getter for the time system correction type.
58       * @return the time system correction type
59       */
60      public String getTimeSystemCorrectionType() {
61          return timeSystemCorrectionType;
62      }
63  
64      /**
65       * Getter for the A0 coefficient of the time system correction.
66       * <p>
67       * deltaT = {@link #getTimeSystemCorrectionA0() A0} +
68       *          {@link #getTimeSystemCorrectionA1() A1} * (t - tref)
69       * </p>
70       * @return the A0 coefficient of the time system correction
71       */
72      public double getTimeSystemCorrectionA0() {
73          return timeSystemCorrectionA0;
74      }
75  
76      /**
77       * Getter for the A1 coefficient of the time system correction.
78       * <p>
79       * deltaT = {@link #getTimeSystemCorrectionA0() A0} +
80       *          {@link #getTimeSystemCorrectionA1() A1} * (t - tref)
81       * </p>
82       * @return the A1 coefficient of the time system correction
83       */
84      public double getTimeSystemCorrectionA1() {
85          return timeSystemCorrectionA1;
86      }
87  
88      /**
89       * Getter for the reference date of the time system correction polynomial.
90       * @return the reference date of the time system correction polynomial,
91       * or null for GLONASS correction, which is constant
92       */
93      public AbsoluteDate getReferenceDate() {
94          return referenceDate;
95      }
96  
97  }