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.modifiers;
18  
19  import java.util.Collections;
20  import java.util.List;
21  
22  import org.orekit.estimation.measurements.EstimatedMeasurementBase;
23  import org.orekit.estimation.measurements.EstimationModifier;
24  import org.orekit.estimation.measurements.gnss.Phase;
25  import org.orekit.gnss.antenna.FrequencyPattern;
26  import org.orekit.utils.ParameterDriver;
27  
28  /** Ground and on-board antennas offsets effect on phase measurements.
29   * @author Luc Maisonobe
30   * @since 12.0
31   */
32  public class PhaseCentersPhaseModifier
33      extends PhaseCentersGroundReceiverBaseModifier<Phase>
34      implements EstimationModifier<Phase> {
35  
36      /** Simple constructor.
37       * @param stationPattern station pattern
38       * @param satellitePattern satellite pattern
39       */
40      public PhaseCentersPhaseModifier(final FrequencyPattern stationPattern,
41                                       final FrequencyPattern satellitePattern) {
42          super(stationPattern, satellitePattern);
43      }
44  
45      /** {@inheritDoc} */
46      @Override
47      public List<ParameterDriver> getParametersDrivers() {
48          return Collections.emptyList();
49      }
50  
51      /** {@inheritDoc} */
52      @Override
53      public void modifyWithoutDerivatives(final EstimatedMeasurementBase<Phase> estimated) {
54          estimated.modifyEstimatedValue(this,
55                                         estimated.getEstimatedValue()[0] +
56                                         oneWayDistanceModification(estimated) /
57                                         estimated.getObservedMeasurement().getWavelength());
58      }
59  
60  }