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.OneWayGNSSRange;
24  import org.orekit.propagation.sampling.OrekitStepInterpolator;
25  import org.orekit.time.AbsoluteDate;
26  
27  /** Builder for {@link OneWayGNSSRange} measurements.
28   * @author Luc Maisonobe
29   * @since 12.0
30   */
31  public class OneWayGNSSRangeBuilder extends AbstractMeasurementBuilder<OneWayGNSSRange> {
32  
33      /** Satellite which simply emits the signal. */
34      private final ObservableSatellite remote;
35  
36     /** Simple constructor.
37       * @param noiseSource noise source, may be null for generating perfect measurements
38       * @param local satellite which receives the signal and performs the measurement
39       * @param remote satellite which simply emits the signal
40       * @param sigma theoretical standard deviation
41       * @param baseWeight base weight
42       */
43      public OneWayGNSSRangeBuilder(final CorrelatedRandomVectorGenerator noiseSource,
44                                    final ObservableSatellite local, final ObservableSatellite remote,
45                                    final double sigma, final double baseWeight) {
46          super(noiseSource, sigma, baseWeight, local, remote);
47          this.remote           = remote;
48      }
49  
50      /** {@inheritDoc} */
51      @Override
52      protected OneWayGNSSRange buildObserved(final AbsoluteDate date,
53                                              final Map<ObservableSatellite, OrekitStepInterpolator> interpolators) {
54          return new OneWayGNSSRange(interpolators.get(remote),
55                                     remote.getQuadraticClockModel(),
56                                     date, Double.NaN,
57                                     getTheoreticalStandardDeviation()[0],
58                                     getBaseWeight()[0], getSatellites()[0]);
59      }
60  
61  }