OemSegment.java
/* Copyright 2002-2022 CS GROUP
* Licensed to CS GROUP (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.files.ccsds.ndm.odm.oem;
import java.util.List;
import org.orekit.files.ccsds.ndm.odm.CartesianCovariance;
import org.orekit.files.ccsds.section.Segment;
import org.orekit.files.general.EphemerisFile;
import org.orekit.frames.Frame;
import org.orekit.time.AbsoluteDate;
import org.orekit.utils.CartesianDerivativesFilter;
import org.orekit.utils.TimeStampedPVCoordinates;
/** The Ephemerides Blocks class contain metadata, the list of ephemerides data
* lines and optional covariance matrices (and their metadata). The reason
* for which the ephemerides have been separated into blocks is that the
* ephemerides of two different blocks are not suited for interpolation.
* @author sports
*/
public class OemSegment extends Segment<OemMetadata, OemData>
implements EphemerisFile.EphemerisSegment<TimeStampedPVCoordinates> {
/** Gravitational parameter in m³/s². */
private final double mu;
/** Simple constructor.
* @param metadata segment metadata
* @param data segment data
* @param mu gravitational parameter in m³/s²
*/
public OemSegment(final OemMetadata metadata, final OemData data, final double mu) {
super(metadata, data);
this.mu = mu;
}
/** {@inheritDoc} */
@Override
public double getMu() {
return mu;
}
/** {@inheritDoc} */
@Override
public List<TimeStampedPVCoordinates> getCoordinates() {
return getData().getCoordinates();
}
/** {@inheritDoc} */
@Override
public CartesianDerivativesFilter getAvailableDerivatives() {
return getData().getAvailableDerivatives();
}
/** Get an unmodifiable view of Covariance Matrices.
* @return unmodifiable view of Covariance Matrices
*/
public List<CartesianCovariance> getCovarianceMatrices() {
return getData().getCovarianceMatrices();
}
/** {@inheritDoc} */
@Override
public Frame getFrame() {
return getMetadata().getFrame();
}
/** {@inheritDoc}
* <p>
* This implementation returns {@link #getFrame() defining frame}
* if it is {@link Frame#isPseudoInertial() pseudo-inertial}, or
* its closest {@link Frame#getParent() ancestor} that is
* pseudo-inertial.
* </p>
*/
@Override
public Frame getInertialFrame() {
Frame frame = getFrame();
while (!frame.isPseudoInertial()) {
frame = frame.getParent();
}
return frame;
}
/** {@inheritDoc} */
@Override
public AbsoluteDate getStart() {
// useable start time overrides start time if it is set
final AbsoluteDate start = getMetadata().getUseableStartTime();
if (start != null) {
return start;
} else {
return getMetadata().getStartTime();
}
}
/** {@inheritDoc} */
@Override
public AbsoluteDate getStop() {
// useable stop time overrides stop time if it is set
final AbsoluteDate stop = getMetadata().getUseableStopTime();
if (stop != null) {
return stop;
} else {
return getMetadata().getStopTime();
}
}
/** {@inheritDoc} */
@Override
public int getInterpolationSamples() {
// From the standard it is not entirely clear how to interpret the degree.
return getMetadata().getInterpolationDegree() + 1;
}
}