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
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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  
18  package org.orekit.propagation.conversion;
19  
20  import org.junit.jupiter.api.Assertions;
21  import org.junit.jupiter.api.Test;
22  import org.orekit.Utils;
23  import org.orekit.data.DataContext;
24  import org.orekit.orbits.CartesianOrbit;
25  import org.orekit.orbits.Orbit;
26  import org.orekit.orbits.PositionAngleType;
27  import org.orekit.propagation.analytical.tle.TLE;
28  import org.orekit.propagation.analytical.tle.generation.FixedPointTleGenerationAlgorithm;
29  import org.orekit.utils.PVCoordinates;
30  import org.orekit.utils.TimeStampedPVCoordinates;
31  
32  import static org.orekit.propagation.conversion.AbstractPropagatorBuilderTest.assertPropagatorBuilderIsACopy;
33  
34  public class TLEPropagatorBuilderTest {
35  
36      @Test
37      void testClone() {
38  
39          // Given
40          final DataContext dataContext = Utils.setDataRoot("regular-data");
41          final TLE tle = new TLE("1 27421U 02021A   02124.48976499 -.00021470  00000-0 -89879-2 0    20",
42                  "2 27421  98.7490 199.5121 0001333 133.9522 226.1918 14.26113993    62");
43          final TLEPropagatorBuilder builder = new TLEPropagatorBuilder(tle, PositionAngleType.MEAN, 1.0, dataContext,
44                  new FixedPointTleGenerationAlgorithm());
45  
46          // When
47          final TLEPropagatorBuilder copyBuilder = builder.clone();
48  
49          // Then
50          assertPropagatorBuilderIsACopy(builder, copyBuilder);
51          Assertions.assertEquals(builder.getTemplateTLE(), copyBuilder.getTemplateTLE());
52  
53      }
54  
55      /** Test for issue #1741.
56       * <p>This test checks that orbital drivers in cloned propagator builders
57       * ain't at the same physical address, i.e. that they're not linked anymore.</p>
58       */
59      @Test
60      void testIssue1741() {
61  
62          // Given
63          final DataContext dataContext = Utils.setDataRoot("regular-data");
64          final TLE tle = new TLE("1 27421U 02021A   02124.48976499 -.00021470  00000-0 -89879-2 0    20",
65                                  "2 27421  98.7490 199.5121 0001333 133.9522 226.1918 14.26113993    62");
66          final TLEPropagatorBuilder builder = new TLEPropagatorBuilder(tle, PositionAngleType.MEAN, 1.0, dataContext,
67                                                                        new FixedPointTleGenerationAlgorithm());
68          final Orbit orbit = builder.createInitialOrbit();
69  
70          // When
71          final TLEPropagatorBuilder copyBuilder = builder.clone();
72  
73  
74          // Change orbit of the copied builder
75          final TimeStampedPVCoordinates modifiedPv = orbit.shiftedBy(3600.).getPVCoordinates();
76          copyBuilder.resetOrbit(new CartesianOrbit(modifiedPv, orbit.getFrame(), orbit.getDate(), orbit.getMu()));
77  
78          // Then
79          // Original builder should still have original orbit
80          final PVCoordinates originalPv = orbit.getPVCoordinates();
81          final PVCoordinates initialPv = builder.createInitialOrbit().getPVCoordinates();
82          final double dP = originalPv.getPosition().distance(initialPv.getPosition());
83          final double dV = originalPv.getVelocity().distance(initialPv.getVelocity());
84          final double dA = originalPv.getAcceleration().distance(initialPv.getAcceleration());
85          Assertions.assertEquals(0., dP, 0.);
86          Assertions.assertEquals(0., dV, 0.);
87          Assertions.assertEquals(0., dA, 0.);
88      }
89  }