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.geometry.euclidean.threed.Vector3D;
20  import org.hipparchus.random.CorrelatedRandomVectorGenerator;
21  import org.orekit.estimation.measurements.ObservableSatellite;
22  import org.orekit.estimation.measurements.PV;
23  import org.orekit.propagation.sampling.OrekitStepInterpolator;
24  import org.orekit.time.AbsoluteDate;
25  
26  import java.util.Map;
27  
28  /** Builder for {@link PV} measurements.
29   * @author Luc Maisonobe
30   * @since 9.3
31   */
32  public class PVBuilder extends AbstractMeasurementBuilder<PV> {
33  
34      /** Simple constructor.
35       * @param noiseSource noise source, may be null for generating perfect measurements
36       * @param sigmaPosition theoretical standard deviation on position components
37       * @param sigmaVelocity theoretical standard deviation on velocity components
38       * @param baseWeight base weight
39       * @param satellite satellite related to this builder
40       */
41      public PVBuilder(final CorrelatedRandomVectorGenerator noiseSource,
42                       final double sigmaPosition, final double sigmaVelocity,
43                       final double baseWeight, final ObservableSatellite satellite) {
44          super(noiseSource,
45                new double[] {
46                    sigmaPosition, sigmaPosition, sigmaPosition,
47                    sigmaVelocity, sigmaVelocity, sigmaVelocity
48                }, new double[] {
49                    baseWeight, baseWeight, baseWeight,
50                    baseWeight, baseWeight, baseWeight
51                }, satellite);
52      }
53  
54      /** {@inheritDoc} */
55      @Override
56      protected PV buildObserved(final AbsoluteDate date,
57                                 final Map<ObservableSatellite, OrekitStepInterpolator> interpolators) {
58          return new PV(date, Vector3D.NaN, Vector3D.NaN,
59                        getTheoreticalStandardDeviation()[0],
60                        getTheoreticalStandardDeviation()[3],
61                        getBaseWeight()[0], getSatellites()[0]);
62      }
63  
64  }