BistaticRangeRateTroposphericDelayModifier.java

  1. /* Copyright 2002-2022 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.modifiers;

  18. import org.orekit.attitudes.InertialProvider;
  19. import org.orekit.estimation.measurements.BistaticRangeRate;
  20. import org.orekit.estimation.measurements.EstimatedMeasurement;
  21. import org.orekit.estimation.measurements.EstimationModifier;
  22. import org.orekit.estimation.measurements.GroundStation;
  23. import org.orekit.models.earth.troposphere.DiscreteTroposphericModel;
  24. import org.orekit.propagation.SpacecraftState;

  25. /** Class modifying theoretical bistatic range-rate measurements with tropospheric delay.
  26.  * <p>
  27.  * The effect of tropospheric correction on the bistatic range-rate is directly computed
  28.  * through the computation of the tropospheric delay difference with respect to time.
  29.  * </p><p>
  30.  * Tropospheric delay is not frequency dependent for signals up to 15 GHz.
  31.  * </p>
  32.  * @author Pascal Parraud
  33.  * @since 11.2
  34.  */
  35. public class BistaticRangeRateTroposphericDelayModifier extends BaseRangeRateTroposphericDelayModifier implements EstimationModifier<BistaticRangeRate> {

  36.     /** Constructor.
  37.      *
  38.      * @param model Tropospheric delay model appropriate for the current range-rate measurement method.
  39.      */
  40.     public BistaticRangeRateTroposphericDelayModifier(final DiscreteTroposphericModel model) {
  41.         super(model);
  42.     }

  43.     /** {@inheritDoc} */
  44.     @Override
  45.     public void modify(final EstimatedMeasurement<BistaticRangeRate> estimated) {

  46.         final BistaticRangeRate measurement = estimated.getObservedMeasurement();
  47.         final GroundStation     emitter     = measurement.getEmitterStation();
  48.         final GroundStation     receiver    = measurement.getReceiverStation();
  49.         final SpacecraftState   state       = estimated.getStates()[0];

  50.         BistaticModifierUtil.modify(estimated, getTropoModel(),
  51.                                     new ModifierGradientConverter(state, 6, new InertialProvider(state.getFrame())),
  52.                                     emitter, receiver,
  53.                                     this::rangeRateErrorTroposphericModel,
  54.                                     this::rangeRateErrorTroposphericModel);
  55.     }

  56. }