Satellite: Attitude Quaternions

The attitude quaternion and angular velocity of the vehicle's body axes computed with respect to the vehicle's central body inertial coordinate system. The quaternion components q1, q2, and q3 are the vector components of the quaternion; q4 is the scalar part. The angular velocity is computed as observed from the inertial frame and resolved into inertial components.

Type: Time-varying data

Availability: Reports | Graphs | Dynamic Displays | Strip Charts

Name Dimension Type Description
Time DateFormat Real Number Time.
q1 Unitless Real Number First element of quaternion (and of its vector part) representing orientation between the two sets of axes.
q2 Unitless Real Number Second element of quaternion (and of its vector part) representing orientation between the two sets of axes.
q3 Unitless Real Number Third element of quaternion (and of its vector part) representing orientation between the two sets of axes.
q4 Unitless Real Number Fourth element of quaternion (its scalar part) representing orientation between the two sets of axes.
wx AngleRateUnit Real Number First component of angular velocity vector between the two sets of axes. Represents projection of angular velocity vector onto x-axis of the selected set.
wy AngleRateUnit Real Number Second component of angular velocity vector between the two sets of axes. Represents projection of angular velocity vector onto y-axis of the selected set.
wz AngleRateUnit Real Number Third component of angular velocity vector between the two sets of axes. Represents projection of angular velocity vector onto z-axis of the selected set.
w mag AngleRateUnit Real Number Magnitude of angular velocity vector between the two sets of axes. Represents relative speed of rotation between the two sets of axes.
RightAscension of w LongitudeUnit Real Number Right ascension of angular velocity vector between the two sets of axes. Represents the angle between the x-axis of the selected set and projection of the angular velocity vector onto the xy-plane of the selected set. The angle is measured counterclockwise about the z-axis of the selected set.
Declination of w AngleUnit Real Number Declination of angular velocity vector between the two sets of axes. Represents the angle between the angular velocity vector and its projection onto the xy-plane of the selected set. The angle is positive when the angular velocity vector is directed toward positive z-axis of the selected set.

STK Programming Interface 11.0.1