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