FieldAbstractAlmanac.java

/* Copyright 2022-2025 Luc Maisonobe
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 * 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
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 *
 *   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.propagation.analytical.gnss.data;

import org.hipparchus.CalculusFieldElement;
import org.hipparchus.Field;
import org.orekit.annotation.DefaultDataContext;
import org.orekit.attitudes.AttitudeProvider;
import org.orekit.data.DataContext;
import org.orekit.frames.Frame;
import org.orekit.frames.Frames;
import org.orekit.propagation.analytical.gnss.FieldGnssPropagator;
import org.orekit.propagation.analytical.gnss.FieldGnssPropagatorBuilder;

import java.util.function.Function;

/**
 * Base class for GNSS almanacs.
 * @param <T> type of the field elements
 * @param <O> type of the orbital elements (non-field version)
 * @author Luc Maisonobe
 * @since 13.0
 */
public abstract class FieldAbstractAlmanac<T extends CalculusFieldElement<T>,
                                           O extends AbstractAlmanac<O>>
    extends FieldCommonGnssData<T, O> {

    /** Constructor from non-field instance.
     * @param field    field to which elements belong
     * @param original regular non-field instance
     */
    protected FieldAbstractAlmanac(final Field<T> field, final O original) {
        super(field, original);
    }

    /** Constructor from different field instance.
     * @param <V> type of the old field elements
     * @param original regular non-field instance
     * @param converter for field elements
     */
    protected <V extends CalculusFieldElement<V>> FieldAbstractAlmanac(final Function<V, T> converter,
                                                                       final FieldAbstractAlmanac<V, O> original) {
        super(converter, original);
    }

    /**
     * Get the propagator corresponding to the navigation message.
     * <p>
     * The attitude provider is set by default to be aligned with the EME2000 frame.<br>
     * The mass is set by default to the
     *  {@link org.orekit.propagation.Propagator#DEFAULT_MASS DEFAULT_MASS}.<br>
     * The ECI frame is set by default to the
     *  {@link org.orekit.frames.Predefined#EME2000 EME2000 frame} in the default data
     *  context.<br>
     * The ECEF frame is set by default to the
     *  {@link org.orekit.frames.Predefined#ITRF_CIO_CONV_2010_SIMPLE_EOP
     *  CIO/2010-based ITRF simple EOP} in the default data context.
     * </p><p>
     * This constructor uses the {@link DataContext#getDefault() default data context}
     * </p>
     * @return the propagator corresponding to the navigation message
     * @see #getPropagator(Frames)
     * @see #getPropagator(Frames, AttitudeProvider, Frame, Frame, CalculusFieldElement)
     */
    @DefaultDataContext
    public FieldGnssPropagator<T> getPropagator() {
        return new FieldGnssPropagatorBuilder<>(this).build();
    }

    /**
     * Get the propagator corresponding to the navigation message.
     * <p>
     * The attitude provider is set by default to be aligned with the EME2000 frame.<br>
     * The mass is set by default to the
     *  {@link org.orekit.propagation.Propagator#DEFAULT_MASS DEFAULT_MASS}.<br>
     * The ECI frame is set by default to the
     *  {@link org.orekit.frames.Predefined#EME2000 EME2000 frame} in the default data
     *  context.<br>
     * The ECEF frame is set by default to the
     *  {@link org.orekit.frames.Predefined#ITRF_CIO_CONV_2010_SIMPLE_EOP
     *  CIO/2010-based ITRF simple EOP} in the default data context.
     * </p>
     * @param frames set of frames to use
     * @return the propagator corresponding to the navigation message
     * @see #getPropagator()
     * @see #getPropagator(Frames, AttitudeProvider, Frame, Frame, CalculusFieldElement)
     */
    public FieldGnssPropagator<T> getPropagator(final Frames frames) {
        return new FieldGnssPropagatorBuilder<>(this, frames).build();
    }

    /**
     * Get the propagator corresponding to the navigation message.
     * @param frames set of frames to use
     * @param provider attitude provider
     * @param inertial inertial frame, use to provide the propagated orbit
     * @param bodyFixed body fixed frame, corresponding to the navigation message
     * @param mass spacecraft mass in kg
     * @return the propagator corresponding to the navigation message
     * @see #getPropagator()
     * @see #getPropagator(Frames)
     */
    public FieldGnssPropagator<T> getPropagator(final Frames frames, final AttitudeProvider provider,
                                                final Frame inertial, final Frame bodyFixed, final T mass) {
        return new FieldGnssPropagatorBuilder<>(this, frames).
               attitudeProvider(provider).
               eci(inertial).
               ecef(bodyFixed).
               mass(mass).
               build();
    }

}