Package gaiasky.util.gaia

Interface IAttitude

All Known Implementing Classes:

ConcreteAttitude

public interface IAttitude

Method Summary

Modifier and Type	Method	Description
double[]	getAlAcRates(double alInstrumentAngle, double acFieldAngle)	Compute the angular speed AL and AC of an inertial direction in the SRS frame, using instrument angles (phi, zeta).
double[]	getAlAcRates(FOV fov, double alFieldAngle, double acFieldAngle)	Compute the angular speed AL and AC of an inertial direction in the SRS frame, using field angles (fov, eta, zeta).
Vector3d[]	getFovDirections()	Get the PFoV and FFoV directions as an array of unit vectors expressed in the ICRS (or CoMRS).
QuaternionDouble	getQuaternion()
QuaternionDouble	getQuaternionDot()
Vector3d	getSpinVectorInIcrs()	Get the inertial spin vector in the ICRS (or CoMRS).
Vector3d	getSpinVectorInSrs()	Get the inertial spin vector in the SRS.
Vector3d[]	getSrsAxes(Vector3d[] xyz)	Get the x, y, z axes of the SRS as an array of three unit vectors expressed in the ICRS (or CoMRS).
long	getTime()	Get the time that this attitude is valid for as a single long value.

Method Details

getTime

long getTime()

Get the time that this attitude is valid for as a single long value. The meaning of the time depends on the TimeContext of the AttitudeDataServer that generated the attitude. Use #getGaiaTime() to get the time as an absolute GaiaTime if needed.

Returns:

time that the attitude is valid for

getQuaternion

QuaternionDouble getQuaternion()

Returns:

quaternion that represents the attitude

getQuaternionDot

QuaternionDouble getQuaternionDot()

Returns:

time derivative [1/day] of the quaternion returned by getQuaternion()

getSpinVectorInSrs

Vector3d getSpinVectorInSrs()

Get the inertial spin vector in the SRS.

Returns:

spin vector in [rad/day] relative to SRS

getSpinVectorInIcrs

Vector3d getSpinVectorInIcrs()

Get the inertial spin vector in the ICRS (or CoMRS).

Returns:

spin vector in [rad/day] relative to ICRS

getFovDirections

Vector3d[] getFovDirections()

Get the PFoV and FFoV directions as an array of unit vectors expressed in the ICRS (or CoMRS).

Returns:

array of two (PFoV, FFoV3) vectors

getSrsAxes

Vector3d[] getSrsAxes(Vector3d[] xyz)

Get the x, y, z axes of the SRS as an array of three unit vectors expressed in the ICRS (or CoMRS).

Returns:

array of three (x, y, z) vectors

getAlAcRates

double[] getAlAcRates(double alInstrumentAngle,
 double acFieldAngle)

Compute the angular speed AL and AC of an inertial direction in the SRS frame, using instrument angles (phi, zeta).

Parameters:

alInstrumentAngle - (=AL angle phi) of the direction [rad]

acFieldAngle - (=AC angle zeta) of the direction [rad]

Returns:

two-element double array containing the angular speed AL and AC [rad/s]

getAlAcRates

double[] getAlAcRates(FOV fov,
 double alFieldAngle,
 double acFieldAngle)

Compute the angular speed AL and AC of an inertial direction in the SRS frame, using field angles (fov, eta, zeta).

Parameters:

fov - FOV (Preceding or Following)

alFieldAngle - (=AL angle eta) of the direction [rad]

acFieldAngle - (=AC angle zeta) of the direction [rad]

Returns:

two-element double array containing the angular speed AL and AC [rad/s]