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.gnss;
18  
19  import java.util.Map;
20  
21  import org.hipparchus.random.CorrelatedRandomVectorGenerator;
22  import org.orekit.estimation.measurements.GroundStation;
23  import org.orekit.estimation.measurements.ObservableSatellite;
24  import org.orekit.estimation.measurements.generation.AbstractMeasurementBuilder;
25  import org.orekit.propagation.sampling.OrekitStepInterpolator;
26  import org.orekit.time.AbsoluteDate;
27  
28  /** Builder for {@link Phase} measurements.
29   * @author Luc Maisonobe
30   * @since 10.1
31   */
32  public class PhaseBuilder extends AbstractMeasurementBuilder<Phase> {
33  
34      /** Cache for ambiguities.
35       * @since 12.1
36       */
37      private final AmbiguityCache cache;
38  
39      /** Ground station from which measurement is performed. */
40      private final GroundStation station;
41  
42      /** Wavelength of the phase observed value [m]. */
43      private final double wavelength;
44  
45      /** Simple constructor.
46       * @param noiseSource noise source, may be null for generating perfect measurements
47       * @param station ground station from which measurement is performed
48       * @param wavelength phase observed value wavelength (m)
49       * @param sigma theoretical standard deviation
50       * @param baseWeight base weight
51       * @param satellite satellite related to this builder
52       * @param cache from which ambiguity drive should come
53       * @since 12.1
54       */
55      public PhaseBuilder(final CorrelatedRandomVectorGenerator noiseSource,
56                          final GroundStation station, final double wavelength,
57                          final double sigma, final double baseWeight,
58                          final ObservableSatellite satellite,
59                          final AmbiguityCache cache) {
60          super(noiseSource, sigma, baseWeight, satellite);
61          this.station    = station;
62          this.wavelength = wavelength;
63          this.cache      = cache;
64      }
65  
66      /** {@inheritDoc} */
67      @Override
68      protected Phase buildObserved(final AbsoluteDate date,
69                                    final Map<ObservableSatellite, OrekitStepInterpolator> interpolators) {
70          return new Phase(station, date, Double.NaN, wavelength,
71                           getTheoreticalStandardDeviation()[0],
72                           getBaseWeight()[0], getSatellites()[0], cache);
73      }
74  
75  }