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;
18  
19  import java.util.Map;
20  
21  import org.hipparchus.analysis.differentiation.Gradient;
22  import org.orekit.frames.FieldTransform;
23  import org.orekit.propagation.SpacecraftState;
24  import org.orekit.utils.TimeStampedFieldPVCoordinates;
25  
26  /** Common intermediate parameters used to estimate measurements where receiver is a ground station.
27   * @author Luc Maisonobe
28   * @since 12.0
29   */
30  public class GroundReceiverCommonParametersWithDerivatives extends CommonParametersWithDerivatives {
31  
32      /** Transform between station and inertial frame. */
33      private final FieldTransform<Gradient> offsetToInertialDownlink;
34  
35      /** Station position in inertial frame at end of the downlink leg. */
36      private final TimeStampedFieldPVCoordinates<Gradient> stationDownlink;
37  
38      /** Simple constructor.
39      * @param state spacecraft state
40      * @param indices derivatives indices map
41      * @param offsetToInertialDownlink transform between station and inertial frame
42      * @param stationDownlink station position in inertial frame at end of the downlink leg
43      * @param tauD downlink delay
44      * @param transitState transit state
45      * @param transitPV transit position/velocity as a gradient
46      */
47      public GroundReceiverCommonParametersWithDerivatives(final SpacecraftState state,
48                                                           final Map<String, Integer> indices,
49                                                           final FieldTransform<Gradient> offsetToInertialDownlink,
50                                                           final TimeStampedFieldPVCoordinates<Gradient> stationDownlink,
51                                                           final Gradient tauD,
52                                                           final SpacecraftState transitState,
53                                                           final TimeStampedFieldPVCoordinates<Gradient> transitPV) {
54          super(state, indices, tauD, transitState, transitPV);
55          this.offsetToInertialDownlink = offsetToInertialDownlink;
56          this.stationDownlink          = stationDownlink;
57      }
58  
59      /** Get transform between station and inertial frame.
60       * @return transform between station and inertial frame
61       */
62      public FieldTransform<Gradient> getOffsetToInertialDownlink() {
63          return offsetToInertialDownlink;
64      }
65  
66      /** Get station position in inertial frame at end of the downlink leg.
67       * @return station position in inertial frame at end of the downlink leg
68       */
69      public TimeStampedFieldPVCoordinates<Gradient> getStationDownlink() {
70          return stationDownlink;
71      }
72  
73  }