Data Provider Groups | Data Provider Elements

Position Covariance

Reports data about position covariance matrix including orientation of its principal axes relative to selected set of axes. Any set of axes defined in the Vector Geometry Tool is available for use, including user defined sets. The data requires position covariance to be defined for the object. Note: This data provider does not support interpolation of the position/velocity covariance matrices. Output is limited to the times of the stored ephemeris points.

Available for these objects: LaunchVehicle, Missile, Satellite

Type: Time-varying data.

Availability: Reports | Graphs | Dynamic Displays | Strip Charts

Data Provider Groups

Any Axes component owned by the object is available for use, including user defined ones. Use the Analysis Workbench listing or the Report Manager->Report Content Properties tool to determine the actual set of components that can be used for a specific object.

Data Provider Elements

Name	Dimension	Type	Description
Time	Date	Real Number or Text	Time.
Sigma X	Distance	Real Number	Square root of the first diagonal component of the covariance matrix.
Sigma Y	Distance	Real Number	Square root of the second diagonal component of the covariance matrix.
Sigma Z	Distance	Real Number	Square root of the third diagonal component of the covariance matrix.
Correlation XY	Unitless	Real Number	XY correlation coefficient of the covariance matrix.
Correlation XZ	Unitless	Real Number	XZ correlation coefficient of the covariance matrix.
Correlation YZ	Unitless	Real Number	YZ correlation coefficient of the covariance matrix.
PosCovMtx XX	Area	Real Number	XX Component of the Position Covariance Matrix.
PosCovMtx YX	Area	Real Number	YX Component of the Position Covariance Matrix.
PosCovMtx YY	Area	Real Number	YY Component of the Position Covariance Matrix.
PosCovMtx ZX	Area	Real Number	ZX Component of the Position Covariance Matrix.
PosCovMtx ZY	Area	Real Number	ZY Component of the Position Covariance Matrix.
PosCovMtx ZZ	Area	Real Number	ZZ Component of the Position Covariance Matrix.
YPR321 yaw	Angle	Real Number or Text	Yaw angle between the two sets of axes. Defines rotation about the z-axis of the reference set, which occurs first when using 321 (or YPR) sequence in YPR angles representation.
YPR321 pitch	Angle	Real Number or Text	Pitch angle between the two sets of axes. Defines rotation about the y-axis of the reference set, which occurs second when using 321 (or YPR) sequence in YPR angles representation.
YPR321 roll	Angle	Real Number or Text	Roll angle between the two sets of axes. Defines rotation about the x-axis of the reference set, which occurs third when using 321 (or YPR) sequence in YPR angles representation.
Euler323 precession	Angle	Real Number or Text	Precession angle between the two sets of axes. Defines rotation about the z-axis of the reference set, which occurs first when using 323 sequence in Euler angles representation.
Euler323 nutation	Angle	Real Number or Text	Nutation angle between the two sets of axes. Defines rotation about the y-axis of the set rotated through precession, which occurs second when using 323 sequence in Euler angles representation.
Euler323 spin	Angle	Real Number or Text	Spin angle between the two sets of axes. Defines rotation about the z-axis of the set rotated through precession and nutation, which occurs third when using 323 sequence in Euler angles representation.
q1	Unitless	Real Number	First element of quaternion (and of its vector part) representing the orientation between the two sets of axes.
q2	Unitless	Real Number	Second element of quaternion (and of its vector part) representing the orientation between the two sets of axes.
q3	Unitless	Real Number	Third element of quaternion (and of its vector part) representing the orientation between the two sets of axes.
q4	Unitless	Real Number	Fourth element of quaternion (its scalar part) representing the orientation between the two sets of axes.
wx	AngleRate	Real Number	The X component of the angular velocity vector, expressed in axes defined by the principal axes of the position covariance ellipsoid. The angular velocity measures the rate of change of the principal axes of the position covariance ellipsoid with respect to the selected set of axes.
wy	AngleRate	Real Number	The Y component of the angular velocity vector, expressed in axes defined by the principal axes of the position covariance ellipsoid. The angular velocity measures the rate of change of the principal axes of the position covariance ellipsoid with respect to the selected set of axes.
wz	AngleRate	Real Number	The Z component of the angular velocity vector, expressed in axes defined by the principal axes of the position covariance ellipsoid. The angular velocity measures the rate of change of the principal axes of the position covariance ellipsoid with respect to the selected set of axes.
w mag	AngleRate	Real Number	Magnitude of the angular velocity vector. The angular velocity measures the rate of change of the principal axes of the position covariance ellipsoid with respect to the selected set of axes.
RightAscension of w	Angle	Real Number or Text	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	Angle	Real Number or Text	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.
Eigen-Angle	Angle	Real Number or Text	Angle of eigen-rotation between the two sets of axes, i.e. a single axis rotation that aligns the two sets of axes.
Eigen-Axis x	Unitless	Real Number	First component of a unit vector representing the axis of eigen-rotation between the two sets of axes. Defines instantaneous projection of the eigen-axis onto x-axis of either of the two sets of axes.
Eigen-Axis y	Unitless	Real Number	Second component of a unit vector representing the axis of eigen-rotation between the two sets of axes. Defines instantaneous projection of the eigen-axis onto y-axis of either of the two sets of axes.
Eigen-Axis z	Unitless	Real Number	Third component of a unit vector representing the axis of eigen-rotation between the two sets of axes. Defines instantaneous projection of the eigen-axis onto z-axis of either of the two sets of axes.