1   /* Copyright 2022-2025 Thales Alenia Space
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.OneWayGNSSRangeRate;
22  import org.orekit.propagation.sampling.OrekitStepInterpolator;
23  import org.orekit.time.AbsoluteDate;
24  
25  import java.util.Map;
26  
27  /** Builder for {@link org.orekit.estimation.measurements.gnss.OneWayGNSSRangeRate} measurements.
28   * @author Luc Maisonobe
29   * @since 12.1
30   */
31  public class OneWayGNSSRangeRateBuilder
32      extends AbstractMeasurementBuilder<OneWayGNSSRangeRate> {
33  
34      /** Satellite which simply emits the signal. */
35      private final ObservableSatellite remote;
36  
37      /** Simple constructor.
38       * @param noiseSource noise source, may be null for generating perfect measurements
39       * @param local satellite which receives the signal and performs the measurement
40       * @param remote satellite which simply emits the signal
41       * @param sigma theoretical standard deviation
42       * @param baseWeight base weight
43       */
44      public OneWayGNSSRangeRateBuilder(final CorrelatedRandomVectorGenerator noiseSource,
45                                        final ObservableSatellite local, final ObservableSatellite remote,
46                                        final double sigma, final double baseWeight) {
47          super(noiseSource, sigma, baseWeight, local, remote);
48          this.remote = remote;
49      }
50  
51      /** {@inheritDoc} */
52      @Override
53      protected OneWayGNSSRangeRate buildObserved(final AbsoluteDate date,
54                                                  final Map<ObservableSatellite, OrekitStepInterpolator> interpolators) {
55          return new OneWayGNSSRangeRate(interpolators.get(remote),
56                                         remote.getQuadraticClockModel(),
57                                         date, Double.NaN,
58                                         getTheoreticalStandardDeviation()[0],
59                                         getBaseWeight()[0], getSatellites()[0]);
60      }
61  
62  }