FrequencyPattern.java
- /* Copyright 2002-2021 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.antenna;
- import org.hipparchus.geometry.euclidean.threed.Vector3D;
- import org.hipparchus.util.FastMath;
- /**
- * Pattern for GNSS antenna model on one frequency.
- *
- * @author Luc Maisonobe
- * @since 9.2
- * @see <a href="ftp://www.igs.org/pub/station/general/antex14.txt">ANTEX: The Antenna Exchange Format, Version 1.4</a>
- *
- */
- public class FrequencyPattern {
- /** Phase center eccentricities (m). */
- private final Vector3D eccentricities;
- /** Phase center variation function. */
- private final PhaseCenterVariationFunction phaseCenterVariationFunction;
- /** Simple constructor.
- * @param eccentricities phase center eccentricities (m)
- * @param phaseCenterVariationFunction phase center variation function
- */
- protected FrequencyPattern(final Vector3D eccentricities,
- final PhaseCenterVariationFunction phaseCenterVariationFunction) {
- this.eccentricities = eccentricities;
- this.phaseCenterVariationFunction = phaseCenterVariationFunction;
- }
- /** Get the phase center eccentricities.
- * @return phase center eccentricities (m)
- */
- public Vector3D getEccentricities() {
- return eccentricities;
- }
- /** Get the value of the phase center variation in a signal direction.
- * @param direction signal direction in antenna reference frame
- * @return value of the phase center variation
- */
- public double getPhaseCenterVariation(final Vector3D direction) {
- return phaseCenterVariationFunction.value(0.5 * FastMath.PI - direction.getDelta(),
- direction.getAlpha());
- }
- }