QZSSScale.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.time;
import org.hipparchus.CalculusFieldElement;
/** QZSS time scale.
* <p>By convention, TQZSS = TAI - 19 s.</p>
* <p>The time scale is defined in <a
* href="http://qzss.go.jp/en/technical/download/pdf/ps-is-qzss/is-qzss-pnt-003.pdf?t=1549268771755">
* Quasi-Zenith Satellite System Navigation Service - Interface Specification for QZSS</a> version 1.6, 2014.
* </p>
* <p>This is intended to be accessed thanks to {@link TimeScales},
* so there is no public constructor.</p>
* @author Luc Maisonobe
* @see AbsoluteDate
*/
public class QZSSScale implements TimeScale {
/** Serializable UID. */
private static final long serialVersionUID = 20131209L;
/** Offset from TAI. */
private static final double OFFSET = -19;
/** Package private constructor for the factory.
*/
QZSSScale() {
}
/** {@inheritDoc} */
@Override
public double offsetFromTAI(final AbsoluteDate date) {
return OFFSET;
}
/** {@inheritDoc} */
@Override
public <T extends CalculusFieldElement<T>> T offsetFromTAI(final FieldAbsoluteDate<T> date) {
return date.getField().getZero().add(OFFSET);
}
/** {@inheritDoc} */
@Override
public double offsetToTAI(final DateComponents date, final TimeComponents time) {
return -OFFSET;
}
/** {@inheritDoc} */
public String getName() {
return "QZSS";
}
/** {@inheritDoc} */
public String toString() {
return getName();
}
}