MappingFunction.java
/* Copyright 2002-2019 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.models.earth;
import java.io.Serializable;
import java.util.List;
import org.hipparchus.Field;
import org.hipparchus.RealFieldElement;
import org.hipparchus.util.MathArrays;
import org.orekit.time.AbsoluteDate;
import org.orekit.time.FieldAbsoluteDate;
import org.orekit.utils.ParameterDriver;
/** Interface for mapping functions used in the tropospheric delay computation.
* @author Bryan Cazabonne
*/
public interface MappingFunction extends Serializable {
/** This method allows the computation of the hydrostatic and
* wet mapping functions. The resulting element is an array having the following form:
* <ul>
* <li>double[0] = m<sub>h</sub>(e) → hydrostatic mapping function
* <li>double[1] = m<sub>w</sub>(e) → wet mapping function
* </ul>
* @param elevation the elevation of the satellite, in radians.
* @param height the height of the station in m above sea level.
* @param parameters tropospheric model parameters.
* @param date current date
* @return a two components array containing the hydrostatic and wet mapping functions.
*/
double[] mappingFactors(double elevation, double height, double[] parameters, AbsoluteDate date);
/** This method allows the computation of the hydrostatic and
* wet mapping functions. The resulting element is an array having the following form:
* <ul>
* <li>T[0] = m<sub>h</sub>(e) → hydrostatic mapping function
* <li>T[1] = m<sub>w</sub>(e) → wet mapping function
* </ul>
* @param elevation the elevation of the satellite, in radians.
* @param height the height of the station in m above sea level.
* @param parameters tropospheric model parameters.
* @param date current date
* @param <T> type of the elements
* @return a two components array containing the hydrostatic and wet mapping functions.
*/
<T extends RealFieldElement<T>> T[] mappingFactors(T elevation, T height, T[] parameters, FieldAbsoluteDate<T> date);
/** Get the drivers for tropospheric model parameters.
* @return drivers for tropospheric model parameters
*/
List<ParameterDriver> getParametersDrivers();
/** Get tropospheric model parameters.
* @return tropospheric model parameters
*/
default double[] getParameters() {
final List<ParameterDriver> drivers = getParametersDrivers();
final double[] parameters = new double[drivers.size()];
for (int i = 0; i < drivers.size(); ++i) {
parameters[i] = drivers.get(i).getValue();
}
return parameters;
}
/** Get tropospheric model parameters.
* @param field field to which the elements belong
* @param <T> type of the elements
* @return tropospheric model parameters
*/
default <T extends RealFieldElement<T>> T[] getParameters(final Field<T> field) {
final List<ParameterDriver> drivers = getParametersDrivers();
final T[] parameters = MathArrays.buildArray(field, drivers.size());
for (int i = 0; i < drivers.size(); ++i) {
parameters[i] = field.getZero().add(drivers.get(i).getValue());
}
return parameters;
}
}