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.InterSatellitesRange;
21  import org.orekit.estimation.measurements.ObservableSatellite;
22  import org.orekit.propagation.sampling.OrekitStepInterpolator;
23  import org.orekit.time.AbsoluteDate;
24  
25  import java.util.Map;
26  
27  /** Builder for {@link InterSatellitesRange} measurements.
28   * @author Luc Maisonobe
29   * @since 9.3
30   */
31  public class InterSatellitesRangeBuilder extends AbstractMeasurementBuilder<InterSatellitesRange> {
32  
33      /** Flag indicating whether it is a two-way measurement. */
34      private final boolean twoway;
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 in the one-way case,
40       * or reflects the signal in the two-way case
41       * @param twoWay flag indicating whether it is a two-way measurement
42       * @param sigma theoretical standard deviation
43       * @param baseWeight base weight
44       */
45      public InterSatellitesRangeBuilder(final CorrelatedRandomVectorGenerator noiseSource,
46                                         final ObservableSatellite local, final ObservableSatellite remote,
47                                         final boolean twoWay, final double sigma, final double baseWeight) {
48          super(noiseSource, sigma, baseWeight, local, remote);
49          this.twoway = twoWay;
50      }
51  
52      /** {@inheritDoc} */
53      @Override
54      protected InterSatellitesRange buildObserved(final AbsoluteDate date,
55                                                   final Map<ObservableSatellite, OrekitStepInterpolator> interpolators) {
56          return new InterSatellitesRange(getSatellites()[0], getSatellites()[1],
57                                          twoway, date, Double.NaN,
58                                          getTheoreticalStandardDeviation()[0],
59                                          getBaseWeight()[0]);
60      }
61  
62  }