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 org.hipparchus.analysis.differentiation.Gradient;
20  import org.orekit.propagation.SpacecraftState;
21  import org.orekit.utils.TimeStampedFieldPVCoordinates;
22  
23  import java.util.Map;
24  
25  /** Common intermediate parameters used to estimate measurements where receiver is a ground station.
26   * @author Luc Maisonobe
27   * @since 12.1
28   */
29  public class CommonParametersWithDerivatives {
30  
31      /** Spacecraft state. */
32      private final SpacecraftState state;
33  
34      /** Derivatives indices map. */
35      private final Map<String, Integer> indices;
36  
37      /** Downlink delay. */
38      private final Gradient tauD;
39  
40      /** Transit state. */
41      private final SpacecraftState transitState;
42  
43      /** Transit state. */
44      private final TimeStampedFieldPVCoordinates<Gradient> transitPV;
45  
46      /** Simple constructor.
47      * @param state spacecraft state
48      * @param indices derivatives indices map
49      * @param tauD downlink delay
50      * @param transitState transit state
51      * @param transitPV transit position/velocity as a gradient
52      */
53      public CommonParametersWithDerivatives(final SpacecraftState state,
54                                             final Map<String, Integer> indices,
55                                             final Gradient tauD,
56                                             final SpacecraftState transitState,
57                                             final TimeStampedFieldPVCoordinates<Gradient> transitPV) {
58          this.state        = state;
59          this.indices      = indices;
60          this.tauD         = tauD;
61          this.transitState = transitState;
62          this.transitPV    = transitPV;
63      }
64  
65      /** Get spacecraft state.
66       * @return spacecraft state
67       */
68      public SpacecraftState getState() {
69          return state;
70      }
71  
72      /** Get derivatives indices map.
73       * @return derivatives indices map
74       */
75      public Map<String, Integer> getIndices() {
76          return indices;
77      }
78  
79      /** Get downlink delay.
80       * @return ownlink delay
81       */
82      public Gradient getTauD() {
83          return tauD;
84      }
85  
86      /** Get transit state.
87       * @return transit state
88       */
89      public SpacecraftState getTransitState() {
90          return transitState;
91      }
92  
93      /** Get transit position/velocity.
94       * @return transit position/velocity
95       */
96      public TimeStampedFieldPVCoordinates<Gradient> getTransitPV() {
97          return transitPV;
98      }
99  
100 }