GPSOrbitalElements.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
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package org.orekit.propagation.analytical.gnss;

/** This interface provides the minimal set of orbital elements needed by the {@link GPSPropagator}.
 *
 * @see <a href="http://www.gps.gov/technical/icwg/IS-GPS-200H.pdf">GPS Interface Specification</a>
 * @author Pascal Parraud
 * @since 8.0
 *
 */
public interface GPSOrbitalElements extends GNSSOrbitalElements {

    // Constants
    /** WGS 84 value of the Earth's universal gravitational parameter for GPS user in m³/s². */
    double GPS_MU = 3.986005e+14;

    /** Value of Pi for conversion from semicircles to radian. */
    double GPS_PI = 3.1415926535898;

    /** Duration of the GPS week in seconds. */
    double GPS_WEEK_IN_SECONDS = 604800.;

    /** Number of weeks in the GPS cycle. */
    int GPS_WEEK_NB = 1024;

    /**
     * Gets the Issue Of Data Clock (IODC).
     *
     * @return the Issue Of Data Clock (IODC)
     * @since 9.3
     */
    default int getIODC() {
        return 0;
    }

    /**
     * Gets the Issue Of Data Ephemeris (IODE).
     *
     * @return the Issue Of Data Ephemeris (IODE)
     * @since 9.3
     */
    default int getIODE() {
        return 0;
    }

    /**
     * Gets the estimated group delay differential TGD for L1-L2 correction.
     *
     * @return the estimated group delay differential TGD for L1-L2 correction (s)
     * @since 9.3
     */
    default double getTGD() {
        return 0.0;
    }

}