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    * CS licenses this file to You under the Apache License, Version 2.0
    * (the "License"); you may not use this file except in compliance with
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    *
    *   http://www.apache.org/licenses/LICENSE-2.0
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   * Unless required by applicable law or agreed to in writing, software
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  package org.orekit.estimation.measurements.generation;
  
  import org.hipparchus.linear.MatrixUtils;
  import org.hipparchus.linear.RealMatrix;
  import org.hipparchus.random.CorrelatedRandomVectorGenerator;
  import org.hipparchus.random.GaussianRandomGenerator;
  import org.hipparchus.random.RandomGenerator;
  import org.hipparchus.util.FastMath;
  import org.junit.jupiter.api.Test;
  import org.orekit.estimation.measurements.AngularAzEl;
  import org.orekit.estimation.measurements.GroundStation;
  import org.orekit.estimation.measurements.ObservableSatellite;
  import org.orekit.estimation.measurements.modifiers.Bias;
  
  public class AngularAzElBuilderTest extends AbstractGroundMeasurementBuilderTest<AngularAzEl> {
  
      private static final double SIGMA = 1.0e-3;
      private static final double BIAS  = 1.0e-4;
  
      protected MeasurementBuilder<AngularAzEl> getBuilder(final RandomGenerator random,
                                                           final GroundStation groundStation,
                                                           final ObservableSatellite satellite) {
          final RealMatrix covariance = MatrixUtils.createRealDiagonalMatrix(new double[] { SIGMA * SIGMA, SIGMA * SIGMA });
          MeasurementBuilder<AngularAzEl> ab =
                          new AngularAzElBuilder(random == null ? null : new CorrelatedRandomVectorGenerator(covariance,
                                                                                                             1.0e-10,
                                                                                                             new GaussianRandomGenerator(random)),
                                                 groundStation, new double[] { SIGMA, SIGMA}, new double[] { 1.0, 1.0 },
                                                 satellite);
          ab.addModifier(new Bias<>(new String[] { "aBias", "eBias" },
                          new double[] { BIAS, BIAS },
                          new double[] { 1.0, 1.0 },
                          new double[] { -FastMath.PI, -0.5 * FastMath.PI },
                          new double[] { +FastMath.PI, +0.5 * FastMath.PI }));
          return ab;
      }
  
      @Test
      public void testForward() {
          doTest(0x527ebeb15d630624l, 0.4, 0.9, 128, 2.9 * SIGMA);
      }
  
      @Test
      public void testBackward() {
          doTest(0x5300b1314adab8cbl, -0.2, -0.6, 100, 2.6 * SIGMA);
      }
  
  }