Package gaiasky.util.gaia

Class AttitudeConverter

java.lang.Object
gaiasky.util.gaia.AttitudeConverter
public class AttitudeConverter extends Object

  • Constructor Details

    • AttitudeConverter

      public AttitudeConverter()

  • Method Details

    • heliotropicToQuaternions

      public static QuaternionDouble[] 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 QuaternionDouble[] 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:
      an array of two quaternions, q (the attitude quaternion) and qDot (the time derivative of q, per day)

    • getHeliotropicAnglesRates

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