PositionBuilder.java

/* Copyright 2002-2025 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
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 * distributed under the License is distributed on an "AS IS" BASIS,
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package org.orekit.estimation.measurements.generation;

import org.hipparchus.geometry.euclidean.threed.Vector3D;
import org.hipparchus.random.CorrelatedRandomVectorGenerator;
import org.orekit.estimation.measurements.ObservableSatellite;
import org.orekit.estimation.measurements.Position;
import org.orekit.propagation.sampling.OrekitStepInterpolator;
import org.orekit.time.AbsoluteDate;

import java.util.Map;

/** Builder for {@link Position} measurements.
 * @author Luc Maisonobe
 * @since 9.3
 */
public class PositionBuilder extends AbstractMeasurementBuilder<Position> {

    /** Simple constructor.
     * @param noiseSource noise source, may be null for generating perfect measurements
     * @param sigma theoretical standard deviation
     * @param baseWeight base weight
     * @param satellite satellite related to this builder
     */
    public PositionBuilder(final CorrelatedRandomVectorGenerator noiseSource,
                           final double sigma, final double baseWeight,
                           final ObservableSatellite satellite) {
        super(noiseSource, sigma, baseWeight, satellite);
    }

    /** {@inheritDoc} */
    @Override
    protected Position buildObserved(final AbsoluteDate date,
                                     final Map<ObservableSatellite, OrekitStepInterpolator> interpolators) {
        return new Position(date, Vector3D.NaN,
                            getTheoreticalStandardDeviation()[0],
                            getBaseWeight()[0], getSatellites()[0]);

    }

}