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.estimation.measurements.generation;
18  
19  import org.hipparchus.random.CorrelatedRandomVectorGenerator;
20  import org.orekit.estimation.measurements.AngularAzEl;
21  import org.orekit.estimation.measurements.GroundStation;
22  import org.orekit.estimation.measurements.ObservableSatellite;
23  import org.orekit.propagation.sampling.OrekitStepInterpolator;
24  import org.orekit.time.AbsoluteDate;
25  
26  import java.util.Map;
27  
28  /** Builder for {@link AngularAzEl} measurements.
29   * @author Luc Maisonobe
30   * @since 9.3
31   */
32  public class AngularAzElBuilder extends AbstractMeasurementBuilder<AngularAzEl> {
33  
34      /** Zero value for initial dummy measurement. */
35      private static final double[] ZERO = { 0.0, 0.0 };
36  
37      /** Ground station from which measurement is performed. */
38      private final GroundStation station;
39  
40      /** Simple constructor.
41       * @param noiseSource noise source, may be null for generating perfect measurements
42       * @param station ground station from which measurement is performed
43       * @param sigma theoretical standard deviation
44       * @param baseWeight base weight
45       * @param satellite satellite related to this builder
46       */
47      public AngularAzElBuilder(final CorrelatedRandomVectorGenerator noiseSource,
48                                final GroundStation station,
49                                final double[] sigma, final double[] baseWeight,
50                                final ObservableSatellite satellite) {
51          super(noiseSource, sigma, baseWeight, satellite);
52          this.station = station;
53      }
54  
55      /** {@inheritDoc} */
56      @Override
57      protected AngularAzEl buildObserved(final AbsoluteDate date,
58                                          final Map<ObservableSatellite, OrekitStepInterpolator> interpolators) {
59          return new AngularAzEl(station, date, ZERO,
60                                 getTheoreticalStandardDeviation(),
61                                 getBaseWeight(), getSatellites()[0]);
62      }
63  
64  }