Package gaiasky.util.gaia

Class AttitudeConverter

java.lang.Object
gaiasky.util.gaia.AttitudeConverter
public class AttitudeConverter
extends java.lang.Object
Convert a given set of heliotropic angles into a quaternion

  • Constructor Summary

    Constructors
    Constructor Description
    AttitudeConverter()  

  • Method Summary

    Modifier and Type Method Description
    static HeliotropicAnglesRates getHeliotropicAnglesRates​(long gt, Attitude att)
    Calculate the heliotropic angles and rates for a given attitude
    static Quaterniond[] getQuaternionAndRate​(long gt, HeliotropicAnglesRates h)
    Converts heliotropic angles and rates to an attitude quaternion and its derivative
    static Quaterniond[] heliotropicToQuaternions​(double lSun, double xi, double nu, double omega, double lSunDot, double nuDot, double omegaDot)
    Converts heliotropic angles and rates to an attitude quaternion and its derivative
    static double[] heliotropicToQuaternionSrsRates​(double lSun, double xi, double nu, double omega, double lSunDot, double nuDot, double omegaDot)
    Converts heliotropic angles and rates to the attitude quaternion components and the inertial rates in SRS

    Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • Constructor Details

    • AttitudeConverter

      public AttitudeConverter()

  • Method Details

    • heliotropicToQuaternions

      public static Quaterniond[] heliotropicToQuaternions​(double lSun, double xi, double nu, double omega, double lSunDot, double nuDot, double omegaDot)
      Converts heliotropic angles and rates to an attitude quaternion and its derivative
      Parameters:
      lSun - longitude of the nominal sun [rad]
      xi - solar aspect angle [rad]
      nu - revolving phase angle [rad]
      omega - scan phase angle [rad]
      lSunDot - time derivative of lSun [rad/day]
      nuDot - time derivative of nu [rad/day]
      omegaDot - time derivative of omega [rad/day]
      Returns:
      an array of two quaternions, q (the attitude quaternion) and qDot (the time derivative of q, per day)

    • heliotropicToQuaternionSrsRates

      public static double[] heliotropicToQuaternionSrsRates​(double lSun, double xi, double nu, double omega, double lSunDot, double nuDot, double omegaDot)
      Converts heliotropic angles and rates to the attitude quaternion components and the inertial rates in SRS
      Parameters:
      lSun - longitude of the nominal sun [rad]
      xi - solar aspect angle [rad]
      nu - revolving phase angle [rad]
      omega - scan phase angle [rad]
      lSunDot - time derivative of lSun [rad/day]
      nuDot - time derivative of nu [rad/day]
      omegaDot - time derivative of omega [rad/day]
      Returns:
      double[] array {qx, qy, qz, qw, rateX, rateY, rateZ} with rates in [rad/day]

    • getQuaternionAndRate

      public static Quaterniond[] getQuaternionAndRate​(long gt, HeliotropicAnglesRates h)
      Converts heliotropic angles and rates to an attitude quaternion and its derivative
      Parameters:
      gt - GaiaTime
      h - heliotropic angles and their rates in [rad] and [rad/day]
      Returns:

    • getHeliotropicAnglesRates

      public static HeliotropicAnglesRates getHeliotropicAnglesRates​(long gt, Attitude att)
      Calculate the heliotropic angles and rates for a given attitude
      Parameters:
      gt - Time for the attitude
      att - attitude
      Returns: