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.ccsds.ndm.tdm;
18  
19  import org.orekit.time.AbsoluteDate;
20  
21  /** Interface for converting {@link RangeUnits#RU Range Units} to meters.
22   * <p>
23   * Implementations of this interface must be provided by user when dealing
24   * with {@link Tdm Tracking Data Messages} that include range observations
25   * in {@link RangeUnits#RU Range Units}. These units are intended for mission-specific
26   * measurements and must be described in an Interface Control Document.
27   * </p>
28   * @author Luc Maisonobe
29   * @since 11.0
30   */
31  public interface RangeUnitsConverter {
32  
33      /** Convert a range expressed in {@link RangeUnits#RU Range Units}.
34       * @param metadata metadata corresponding to the observation
35       * @param date observation date
36       * @param range range value in {@link RangeUnits#RU Range Units}
37       * @return range range value in meters
38       */
39      double ruToMeters(TdmMetadata metadata, AbsoluteDate date, double range);
40  
41      /** Convert a range expressed in meters.
42       * @param metadata metadata corresponding to the observation
43       * @param date observation date
44       * @param range range value in meters
45       * @return range range value in {@link RangeUnits#RU Range Units}
46       */
47      double metersToRu(TdmMetadata metadata, AbsoluteDate date, double range);
48  
49  }