1   /* Copyright 2002-2020 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.propagation.analytical.gnss;
18  
19  /** This interface provides the minimal set of orbital elements needed by the {@link GalileoPropagator}.
20   *
21   * @see <a href="https://www.gsc-europa.eu/system/files/galileo_documents/Galileo-OS-SIS-ICD.pdf">
22   *         Galileo Interface Control Document</a>
23   *
24   * @author Bryan Cazabonne
25   * @since 10.0
26   *
27   */
28  public interface GalileoOrbitalElements extends GNSSOrbitalElements {
29  
30      // Constants
31      /** Earth's universal gravitational parameter for Galileo user in m³/s². */
32      double GALILEO_MU = 3.986004418e+14;
33  
34      /** Value of Pi for conversion from semicircles to radian. */
35      double GALILEO_PI = 3.1415926535898;
36  
37      /** Duration of the Galileo week in seconds. */
38      double GALILEO_WEEK_IN_SECONDS = 604800.;
39  
40      /** Number of weeks in the Galileo cycle. */
41      int GALILEO_WEEK_NB = 4096;
42  
43      /**
44       * Gets the Issue Of Data (IOD).
45       *
46       * @return the Issue Of Data (IOD)
47       */
48      default int getIODNav() {
49          return 0;
50      }
51  
52      /**
53       * Gets the estimated broadcast group delay differential.
54       *
55       * @return the estimated broadcast group delay differential(s)
56       */
57      default double getBGD() {
58          return 0.0;
59      }
60  
61      /**
62       * Gets the E1/E5a broadcast group delay.
63       *
64       * @return the E1/E5a broadcast group delay (s)
65       */
66      default double getBGDE1E5a() {
67          return 0.0;
68      }
69  
70      /**
71       * Gets the Broadcast Group Delay E5b/E1.
72       *
73       * @return the Broadcast Group Delay E5b/E1 (s)
74       */
75      default double getBGDE5bE1() {
76          return 0.0;
77      }
78  
79  }