1   /* Copyright 2022-2025 Luc Maisonobe
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 java.util.Map;
20  
21  import org.hipparchus.random.CorrelatedRandomVectorGenerator;
22  import org.orekit.estimation.measurements.ObservableSatellite;
23  import org.orekit.estimation.measurements.gnss.AmbiguityCache;
24  import org.orekit.estimation.measurements.gnss.OneWayGNSSPhase;
25  import org.orekit.propagation.sampling.OrekitStepInterpolator;
26  import org.orekit.time.AbsoluteDate;
27  
28  /** Builder for {@link OneWayGNSSPhase} measurements.
29   * @author Luc Maisonobe
30   * @since 12.0
31   */
32  public class OneWayGNSSPhaseBuilder extends AbstractMeasurementBuilder<OneWayGNSSPhase> {
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      /** Satellite which simply emits the signal. */
43      private final ObservableSatellite remote;
44  
45      /** Simple constructor.
46       * @param noiseSource noise source, may be null for generating perfect measurements
47       * @param local satellite which receives the signal and performs the measurement
48       * @param remote satellite which simply emits the signal
49       * @param wavelength phase observed value wavelength (m)
50       * @param sigma theoretical standard deviation
51       * @param baseWeight base weight
52       * @param cache from which ambiguity drive should come
53       * @since 12.1
54       */
55      public OneWayGNSSPhaseBuilder(final CorrelatedRandomVectorGenerator noiseSource,
56                                    final ObservableSatellite local, final ObservableSatellite remote,
57                                    final double wavelength, final double sigma, final double baseWeight,
58                                    final AmbiguityCache cache) {
59          super(noiseSource, sigma, baseWeight, local, remote);
60          this.wavelength = wavelength;
61          this.remote     = remote;
62          this.cache      = cache;
63      }
64  
65      /** {@inheritDoc} */
66      @Override
67      protected OneWayGNSSPhase buildObserved(final AbsoluteDate date,
68                                              final Map<ObservableSatellite, OrekitStepInterpolator> interpolators) {
69          return new OneWayGNSSPhase(interpolators.get(remote),
70                                     remote.getName(), remote.getQuadraticClockModel(),
71                                     date, Double.NaN, wavelength,
72                                     getTheoreticalStandardDeviation()[0],
73                                     getBaseWeight()[0], getSatellites()[0],
74                                     cache);
75      }
76  
77  }