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.ObservableSatellite;
21  import org.orekit.estimation.measurements.gnss.AmbiguityCache;
22  import org.orekit.estimation.measurements.gnss.InterSatellitesPhase;
23  import org.orekit.propagation.sampling.OrekitStepInterpolator;
24  import org.orekit.time.AbsoluteDate;
25  
26  import java.util.Map;
27  
28  /** Builder for {@link InterSatellitesPhase} measurements.
29   * @author Bryan Cazabonne
30   * @since 10.3
31   */
32  public class InterSatellitesPhaseBuilder extends AbstractMeasurementBuilder<InterSatellitesPhase> {
33  
34      /** Cache for ambiguities.
35       * @since 12.1
36       */
37      private final AmbiguityCache cache;
38  
39      /** Wavelength of the phase observed value [m]. */
40      private final double wavelength;
41  
42      /** Simple constructor.
43       * @param noiseSource noise source, may be null for generating perfect measurements
44       * @param local satellite which receives the signal and performs the measurement
45       * @param remote satellite which simply emits the signal
46       * @param wavelength phase observed value wavelength (m)
47       * @param sigma theoretical standard deviation
48       * @param baseWeight base weight
49       * @param cache from which ambiguity drive should come
50       * @since 12.1
51       */
52      public InterSatellitesPhaseBuilder(final CorrelatedRandomVectorGenerator noiseSource,
53                                         final ObservableSatellite local, final ObservableSatellite remote,
54                                         final double wavelength, final double sigma, final double baseWeight,
55                                         final AmbiguityCache cache) {
56          super(noiseSource, sigma, baseWeight, local, remote);
57          this.cache      = cache;
58          this.wavelength = wavelength;
59      }
60  
61      /** {@inheritDoc} */
62      @Override
63      protected InterSatellitesPhase buildObserved(final AbsoluteDate date,
64                                                   final Map<ObservableSatellite, OrekitStepInterpolator> interpolators) {
65          return new InterSatellitesPhase(getSatellites()[0], getSatellites()[1],
66                                          date, Double.NaN, wavelength,
67                                          getTheoreticalStandardDeviation()[0],
68                                          getBaseWeight()[0], cache);
69      }
70  
71  }