/* Copyright 2002-2017 CS Systèmes d'Information
* Licensed to CS Systèmes d'Information (CS) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* 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
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.orekit.frames;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import org.hipparchus.geometry.euclidean.threed.Vector3D;
import org.hipparchus.util.FastMath;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;
import org.orekit.Utils;
import org.orekit.errors.OrekitException;
import org.orekit.time.AbsoluteDate;
import org.orekit.time.DateComponents;
import org.orekit.time.TimeComponents;
import org.orekit.time.TimeScalesFactory;
import org.orekit.utils.Constants;
import org.orekit.utils.IERSConventions;
import org.orekit.utils.PVCoordinates;
public class TEMEProviderTest {
@Test
public void testValladoTEMEofDate() throws OrekitException {
// this reference test has been extracted from Vallado's book:
// Fundamentals of Astrodynamics and Applications
// David A. Vallado, Space Technology Library, 2007
AbsoluteDate t0 = new AbsoluteDate(new DateComponents(2000, 182),
new TimeComponents(0.78495062 * Constants.JULIAN_DAY),
TimeScalesFactory.getUTC());
// TEME
PVCoordinates pvTEME =
new PVCoordinates(new Vector3D(-9060473.73569, 4658709.52502, 813686.73153),
new Vector3D(-2232.832783, -4110.453490, -3157.345433));
// reference position in EME2000
// note that Valado's book gives
// PVCoordinates pvEME2000Ref =
// new PVCoordinates(new Vector3D(-9059941.3786, 4659697.2000, 813958.8875),
// new Vector3D(-2233.348094, -4110.136162, -3157.394074));
// the values we use here are slightly different, they were computed using
// Vallado's C++ companion code to the book, using the teme_j2k function with
// all 106 nutation terms and the 2 corrections elements of the equation of the equinoxes
PVCoordinates pvEME2000Ref =
new PVCoordinates(new Vector3D(-9059941.5224999374914, 4659697.1225837596648, 813957.72947647583351),
new Vector3D(-2233.3476939179299769, -4110.1362849403413335, -3157.3941963060194738));
Transform t = FramesFactory.getTEME().getTransformTo(FramesFactory.getEME2000(), t0);
PVCoordinates pvEME2000Computed = t.transformPVCoordinates(pvTEME);
PVCoordinates delta = new PVCoordinates(pvEME2000Computed, pvEME2000Ref);
Assert.assertEquals(0.0, delta.getPosition().getNorm(), 0.025);
Assert.assertEquals(0.0, delta.getVelocity().getNorm(), 1.0e-4);
}
@Test
public void testSerialization() throws OrekitException, IOException, ClassNotFoundException {
TEMEProvider provider = new TEMEProvider(IERSConventions.IERS_2010,
FramesFactory.getEOPHistory(IERSConventions.IERS_2010, true));
ByteArrayOutputStream bos = new ByteArrayOutputStream();
ObjectOutputStream oos = new ObjectOutputStream(bos);
oos.writeObject(provider);
Assert.assertTrue(bos.size() > 280000);
Assert.assertTrue(bos.size() < 285000);
ByteArrayInputStream bis = new ByteArrayInputStream(bos.toByteArray());
ObjectInputStream ois = new ObjectInputStream(bis);
TEMEProvider deserialized = (TEMEProvider) ois.readObject();
for (int i = 0; i < FastMath.min(100, provider.getEOPHistory().getEntries().size()); ++i) {
AbsoluteDate date = provider.getEOPHistory().getEntries().get(i).getDate();
Transform expectedIdentity = new Transform(date,
provider.getTransform(date).getInverse(),
deserialized.getTransform(date));
Assert.assertEquals(0.0, expectedIdentity.getTranslation().getNorm(), 1.0e-15);
Assert.assertEquals(0.0, expectedIdentity.getRotation().getAngle(), 1.0e-15);
}
}
@Before
public void setUp() {
Utils.setDataRoot("compressed-data");
}
}