1   /* Copyright 2002-2026 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
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16   */
17  package org.orekit.estimation.measurements.generation;
18  
19  import java.util.Map;
20  
21  import org.orekit.estimation.measurements.AngularAzEl;
22  import org.orekit.estimation.measurements.GroundStation;
23  import org.orekit.estimation.measurements.MeasurementQuality;
24  import org.orekit.estimation.measurements.ObservableSatellite;
25  import org.orekit.propagation.sampling.OrekitStepInterpolator;
26  import org.orekit.signal.SignalTravelTimeModel;
27  import org.orekit.time.AbsoluteDate;
28  
29  /** Builder for {@link AngularAzEl} measurements.
30   * @author Luc Maisonobe
31   * @since 9.3
32   */
33  public class AngularAzElBuilder extends AbstractSignalBasedBuilder<AngularAzEl> {
34  
35      /** Station performing measurement. */
36      private final GroundStation station;
37  
38      /** Simple constructor.
39       * @param station ground station from which measurement is performed
40       * @param sigma theoretical standard deviation
41       * @param baseWeight base weight
42       * @param satellite satellite related to this builder
43       */
44      public AngularAzElBuilder(final GroundStation station,
45                                final double[] sigma, final double[] baseWeight, final ObservableSatellite satellite) {
46          this(station, new MeasurementQuality(sigma, baseWeight), new SignalTravelTimeModel(), satellite);
47      }
48  
49      /** Simple constructor.
50       * @param station ground station from which measurement is performed
51       * @param measurementQuality measurement quality as used in estimation (in Orekit, the crossed-terms
52       *                           of the covariance matrix are only used by Kalman filters, not least squares)
53       * @param signalTravelTimeModel signal travel time model
54       * @param satellite satellite related to this builder
55       * @since 14.0
56       */
57      public AngularAzElBuilder(final GroundStation station,
58                                final MeasurementQuality measurementQuality,
59                                final SignalTravelTimeModel signalTravelTimeModel, final ObservableSatellite satellite) {
60          super(measurementQuality, signalTravelTimeModel, satellite);
61          this.station = station;
62      }
63  
64      /**
65       * Getter for station.
66       * @return station
67       */
68      public GroundStation getStation() {
69          return station;
70      }
71  
72      /** {@inheritDoc} */
73      @Override
74      protected AngularAzEl buildObserved(final AbsoluteDate date,
75                                          final Map<ObservableSatellite, OrekitStepInterpolator> interpolators) {
76          return new AngularAzEl(station, date, new double[2], getMeasurementQuality(), getSignalTravelTimeModel(), getSatellites()[0]);
77      }
78  
79  }