UserRangeAccuracy.java
/* Copyright 2002-2024 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.gnss.metric.messages.common;
import org.hipparchus.util.FastMath;
/** User Range Accuracy.
* @see "IS-GPS-200K, 4 March 2016, Section 20.3.3.3.1.3"
* @author Luc Maisonobe
* @author Bryan Cazabonne
* @since 11.0
*/
public class UserRangeAccuracy implements AccuracyProvider {
/** User Range Accuracy indicator. */
private final int uraIndex;
/**
* Simple constructor.
* @param index integer value of the user range accuracy
*/
public UserRangeAccuracy(final int index) {
this.uraIndex = index;
}
/** {@inheritDoc} */
@Override
public double getAccuracy() {
// Cast index to a double value
final double id = (double) uraIndex;
// Compute accuracy
if (uraIndex < 7) {
if (uraIndex == 1) {
return 2.8;
} else if (uraIndex == 3) {
return 5.7;
} else if (uraIndex == 5) {
return 11.3;
} else {
return FastMath.pow(2.0, 0.5 * id + 1.0);
}
} else if (uraIndex < 15) {
return FastMath.pow(2.0, id - 2.0);
} else {
// Data shall not be used
return 8192.0;
}
}
}