Data Providers: LaunchVehicle: ECF Attitude Quaternions

The attitude quaternion and angular velocity of the vehicle's body axes computed with respect to the vehicle's central body fixed 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 fixed frame and resolved into fixed components.

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.

Name

Dimension

Type

Description

Time

DateFormat

Real Number

Time.

Unitless

Real Number

First element of quaternion (and of its vector part) representing orientation between the two sets of axes.

Unitless

Real Number

Second element of quaternion (and of its vector part) representing orientation between the two sets of axes.

Unitless

Real Number

Third element of quaternion (and of its vector part) representing orientation between the two sets of axes.

Unitless

Real Number

Fourth element of quaternion (its scalar part) representing orientation between the two sets of axes.

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.

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.

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.