GRAPHICCombination.java

  1. /* Copyright 2002-2023 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.gnss;

  18. import org.orekit.gnss.SatelliteSystem;

  19. /**
  20.  * GRoup And Phase Ionospheric Calibration (GRAPHIC) combination.
  21.  * <p>
  22.  * This combination is a ionosphere-free single frequency
  23.  * combination of measurements.
  24.  * </p>
  25.  * <pre>
  26.  *    mf =  0.5 * (Φf + Rf)
  27.  * </pre>
  28.  * With:
  29.  * <ul>
  30.  * <li>mf : GRAPHIC measurement.</li>
  31.  * <li>Φf : Phase measurement.</li>
  32.  * <li>Rf : Code measurement.</li>
  33.  * <li>f  : Frequency.</li>
  34.  * </ul>
  35.  * @author Bryan Cazabonne
  36.  * @since 10.1
  37.  */
  38. public class GRAPHICCombination extends AbstractSingleFrequencyCombination {

  39.     /**
  40.      * Package private constructor for the factory.
  41.      * @param system satellite system for which the combination is applied
  42.      */
  43.     GRAPHICCombination(final SatelliteSystem system) {
  44.         super(CombinationType.GRAPHIC, system);
  45.     }

  46.     /** {@inheritDoc} */
  47.     @Override
  48.     protected double getCombinedValue(final double phase, final double pseudoRange) {
  49.         // Combination does not depend on the frequency
  50.         return 0.5 * (phase + pseudoRange);
  51.     }

  52. }