PVBuilder.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
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 *
 *   http://www.apache.org/licenses/LICENSE-2.0
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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.PV;
import org.orekit.propagation.sampling.OrekitStepInterpolator;
import org.orekit.time.AbsoluteDate;

import java.util.Map;

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

    /** Simple constructor.
     * @param noiseSource noise source, may be null for generating perfect measurements
     * @param sigmaPosition theoretical standard deviation on position components
     * @param sigmaVelocity theoretical standard deviation on velocity components
     * @param baseWeight base weight
     * @param satellite satellite related to this builder
     */
    public PVBuilder(final CorrelatedRandomVectorGenerator noiseSource,
                     final double sigmaPosition, final double sigmaVelocity,
                     final double baseWeight, final ObservableSatellite satellite) {
        super(noiseSource,
              new double[] {
                  sigmaPosition, sigmaPosition, sigmaPosition,
                  sigmaVelocity, sigmaVelocity, sigmaVelocity
              }, new double[] {
                  baseWeight, baseWeight, baseWeight,
                  baseWeight, baseWeight, baseWeight
              }, satellite);
    }

    /** {@inheritDoc} */
    @Override
    protected PV buildObserved(final AbsoluteDate date,
                               final Map<ObservableSatellite, OrekitStepInterpolator> interpolators) {
        return new PV(date, Vector3D.NaN, Vector3D.NaN,
                      getTheoreticalStandardDeviation()[0],
                      getTheoreticalStandardDeviation()[3],
                      getBaseWeight()[0], getSatellites()[0]);
    }

}