AmbiguityDriver.java
/* Copyright 2002-2024 Luc Maisonobe
* 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.estimation.measurements.gnss;
import org.hipparchus.util.FastMath;
import org.orekit.gnss.GnssSignal;
import org.orekit.utils.Constants;
import org.orekit.utils.ParameterDriver;
import java.util.Locale;
/** Specialized {@link ParameterDriver} for ambiguity.
* @author Luc Maisonobe
* @since 12.1
*/
public class AmbiguityDriver extends ParameterDriver {
/** Prefix for parameter drivers names. */
public static final String PREFIX = "ambiguity";
/** Ambiguity scale factor.
* <p>
* We use a power of 2 to avoid numeric noise introduction
* in the multiplications/divisions sequences.
* </p>
*/
private static final double AMBIGUITY_SCALE = FastMath.scalb(1.0, 26);
/** Emitter id. */
private final String emitter;
/** Receiver id. */
private final String receiver;
/** Wavelength. */
private final double wavelength;
/** Simple constructor.
* @param emitter emitter id
* @param receiver receiver id
* @param wavelength signal wavelength
*/
public AmbiguityDriver(final String emitter, final String receiver, final double wavelength) {
// the name is built from emitter, receiver and the multiplier
// with respect to common frequency F0 (10.23 MHz)
super(String.format(Locale.US, "%s-%s-%s-%.2f",
PREFIX, emitter, receiver,
Constants.SPEED_OF_LIGHT / (wavelength * GnssSignal.F0)),
0.0, AMBIGUITY_SCALE, Double.NEGATIVE_INFINITY, Double.POSITIVE_INFINITY);
this.emitter = emitter;
this.receiver = receiver;
this.wavelength = wavelength;
}
/** Get emitter id.
* @return emitter id
*/
public String getEmitter() {
return emitter;
}
/** Get receiver id.
* @return receiver id
*/
public String getReceiver() {
return receiver;
}
/** Get signal wavelength.
* @return signal wavelength
*/
public double getWavelength() {
return wavelength;
}
}