Data Providers: Satellite: Position Covariance in Axes

Reports data about position covariance matrix including orientation of its principal axes relative to selected set of axes and dimensions of the associated sigma scaled equal probability density ellipsoid. 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.

Name	Description
Body	The object Body axes.
ICR	Intrack Crosstrack Radial. The Z axis is outward along the radial, the Y axis is in the direction of the cross product of the position and inertial velocity and X axis is in the direction of motion and constructed as Y x Z.
ICR(CBF)	Intrack Crosstrack Radial using the velocity as measured in the central body fixed frame. The Z axis is outward along the radial, the Y axis is in the direction of the cross product of the position and velocity measured in the central body fixed frame and X axis is in the direction of motion and constructed as Y x Z.
ICRF	International Celestial Reference Frame. The ICRF is the best realization of an inertial frame constructed to date, and thus represents an improvement upon the theory behind the J2000 frame. While the ICRF and J2000 frames themselves are very close, they are not identical; moreover, the J2000 frame rotates (very slowly) over time with respect to the ICRF frame.
J2000	Mean Equator and Mean Equinox of the Earth at the J2000 epoch (JD 2451545.0 TDB which is 1 Jan 2000 12:00:00.000 TDB). The J2000 axes were considered the best realized inertial axes until the development of the ICRF.
LVLH	Local Vertical Local Horizontal, also known as the Gauss frame and the RIC frame. The X axis is outward along the radial (local vertical), the Z axis is in the direction of the cross product of the position and velocity as measured in the central body inertial frame and Y axis is in the direction of motion and constructed as Z x X.
LVLH(CBF)	Local Vertical Local Horizontal using the velocity as measured in the central body fixed frame. The X axis is outward along the radial (local vertical), the Z axis is in the direction of the cross product of the position and velocity as measured in the central body fixed frame and Y axis is in the direction of motion and constructed as Z x X.
LVLH(Earth)	Local Vertical Local Horizontal based on the position and velocity measured in an Earth centered inertial reference frame. The X axis is outward along the radial (local vertical), the Z axis is in the direction of the cross product of the position and velocity as measured in the central body inertial frame and Y axis is in the direction of motion and constructed as Z x X.
Model	Reports data about position covariance matrix including orientation of its principal axes relative to the Model axes and dimensions of the associated sigma scaled equal probability density ellipsoid. 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.
NorthEastDown	Reports data about position covariance matrix including orientation of its principal axes relative to the NorthEastDown axes and dimensions of the associated sigma scaled equal probability density ellipsoid. 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.
NorthWestUp	Reports data about position covariance matrix including orientation of its principal axes relative to the NorthWestUp axes and dimensions of the associated sigma scaled equal probability density ellipsoid. 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.
PositionCovPrincipal	Reports data about position covariance matrix including orientation of its principal axes relative to the PositionCovPrincipal axes and dimensions of the associated sigma scaled equal probability density ellipsoid. 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.
Principal	Reports data about position covariance matrix including orientation of its principal axes relative to the Principal axes and dimensions of the associated sigma scaled equal probability density ellipsoid. 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.
RIC	Reports data about position covariance matrix including orientation of its principal axes relative to the RIC axes and dimensions of the associated sigma scaled equal probability density ellipsoid. 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.
RIC(CBF)	Reports data about position covariance matrix including orientation of its principal axes relative to the RIC(CBF) axes and dimensions of the associated sigma scaled equal probability density ellipsoid. 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.
RadialCentric	Reports data about position covariance matrix including orientation of its principal axes relative to the RadialCentric axes and dimensions of the associated sigma scaled equal probability density ellipsoid. 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.
SEET_GeocentricSolarMagnetic	Geocentric Solar Magnetic: The X-axis aligned with the Earth-Sun line and the Z-axis constrained toward the magnetic north pole.
SEET_Geomagnetic	Geomagnetic frame. The Z axis aligns with the magnetic north pole and the negative X axis is constrained toward the Earth Fixed Z axis.
SEET_SolarMagnetic	Solar Magnetic frame. The Z axis aligns with the magnetic north pole and the X axis is constrained toward sun direction (as viewed from the earth).
TopoCentric	Reports data about position covariance matrix including orientation of its principal axes relative to the TopoCentric axes and dimensions of the associated sigma scaled equal probability density ellipsoid. 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.
TrueOfOrbitEpoch	True equator and true equinox of the Earth at the orbit epoch. The orbit epoch is taken from the initial conditions of the satellite when possible, otherwise it is taken to be the time of the first ephemeris point.
VNC	Reports data about position covariance matrix including orientation of its principal axes relative to the VNC axes and dimensions of the associated sigma scaled equal probability density ellipsoid. 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.
VNC(CBF)	Reports data about position covariance matrix including orientation of its principal axes relative to the VNC(CBF) axes and dimensions of the associated sigma scaled equal probability density ellipsoid. 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.
VNC(Earth)	Reports data about position covariance matrix including orientation of its principal axes relative to the VNC(Earth) axes and dimensions of the associated sigma scaled equal probability density ellipsoid. 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.
VNC(Mars)	Reports data about position covariance matrix including orientation of its principal axes relative to the VNC(Mars) axes and dimensions of the associated sigma scaled equal probability density ellipsoid. 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.
VNC(Moon)	Reports data about position covariance matrix including orientation of its principal axes relative to the VNC(Moon) axes and dimensions of the associated sigma scaled equal probability density ellipsoid. 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.
VNC(Sun)	Reports data about position covariance matrix including orientation of its principal axes relative to the VNC(Sun) axes and dimensions of the associated sigma scaled equal probability density ellipsoid. 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.
VNC(Venus)	Reports data about position covariance matrix including orientation of its principal axes relative to the VNC(Venus) axes and dimensions of the associated sigma scaled equal probability density ellipsoid. 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.
VVLH	Reports data about position covariance matrix including orientation of its principal axes relative to the VVLH axes and dimensions of the associated sigma scaled equal probability density ellipsoid. 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.
VVLH(CBF)	Reports data about position covariance matrix including orientation of its principal axes relative to the VVLH(CBF) axes and dimensions of the associated sigma scaled equal probability density ellipsoid. 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.
VVLH(Earth)	Reports data about position covariance matrix including orientation of its principal axes relative to the VVLH(Earth) axes and dimensions of the associated sigma scaled equal probability density ellipsoid. 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.

Name

Description

Body

The object Body axes.

ICR

Intrack Crosstrack Radial. The Z axis is outward along the radial, the Y axis is in the direction of the cross product of the position and inertial velocity and X axis is in the direction of motion and constructed as Y x Z.

ICR(CBF)

Intrack Crosstrack Radial using the velocity as measured in the central body fixed frame. The Z axis is outward along the radial, the Y axis is in the direction of the cross product of the position and velocity measured in the central body fixed frame and X axis is in the direction of motion and constructed as Y x Z.

ICRF

International Celestial Reference Frame. The ICRF is the best realization of an inertial frame constructed to date, and thus represents an improvement upon the theory behind the J2000 frame. While the ICRF and J2000 frames themselves are very close, they are not identical; moreover, the J2000 frame rotates (very slowly) over time with respect to the ICRF frame.

J2000

Mean Equator and Mean Equinox of the Earth at the J2000 epoch (JD 2451545.0 TDB which is 1 Jan 2000 12:00:00.000 TDB). The J2000 axes were considered the best realized inertial axes until the development of the ICRF.

LVLH

Local Vertical Local Horizontal, also known as the Gauss frame and the RIC frame. The X axis is outward along the radial (local vertical), the Z axis is in the direction of the cross product of the position and velocity as measured in the central body inertial frame and Y axis is in the direction of motion and constructed as Z x X.

LVLH(CBF)

Local Vertical Local Horizontal using the velocity as measured in the central body fixed frame. The X axis is outward along the radial (local vertical), the Z axis is in the direction of the cross product of the position and velocity as measured in the central body fixed frame and Y axis is in the direction of motion and constructed as Z x X.

LVLH(Earth)

Local Vertical Local Horizontal based on the position and velocity measured in an Earth centered inertial reference frame. The X axis is outward along the radial (local vertical), the Z axis is in the direction of the cross product of the position and velocity as measured in the central body inertial frame and Y axis is in the direction of motion and constructed as Z x X.

Model

Reports data about position covariance matrix including orientation of its principal axes relative to the Model axes and dimensions of the associated sigma scaled equal probability density ellipsoid. 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.

NorthEastDown

Reports data about position covariance matrix including orientation of its principal axes relative to the NorthEastDown axes and dimensions of the associated sigma scaled equal probability density ellipsoid. 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.

NorthWestUp

Reports data about position covariance matrix including orientation of its principal axes relative to the NorthWestUp axes and dimensions of the associated sigma scaled equal probability density ellipsoid. 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.

PositionCovPrincipal

Reports data about position covariance matrix including orientation of its principal axes relative to the PositionCovPrincipal axes and dimensions of the associated sigma scaled equal probability density ellipsoid. 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.

Principal

Reports data about position covariance matrix including orientation of its principal axes relative to the Principal axes and dimensions of the associated sigma scaled equal probability density ellipsoid. 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.

RIC

Reports data about position covariance matrix including orientation of its principal axes relative to the RIC axes and dimensions of the associated sigma scaled equal probability density ellipsoid. 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.

RIC(CBF)

Reports data about position covariance matrix including orientation of its principal axes relative to the RIC(CBF) axes and dimensions of the associated sigma scaled equal probability density ellipsoid. 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.

RadialCentric

Reports data about position covariance matrix including orientation of its principal axes relative to the RadialCentric axes and dimensions of the associated sigma scaled equal probability density ellipsoid. 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.

SEET_GeocentricSolarMagnetic

Geocentric Solar Magnetic: The X-axis aligned with the Earth-Sun line and the Z-axis constrained toward the magnetic north pole.

SEET_Geomagnetic

Geomagnetic frame. The Z axis aligns with the magnetic north pole and the negative X axis is constrained toward the Earth Fixed Z axis.

SEET_SolarMagnetic

Solar Magnetic frame. The Z axis aligns with the magnetic north pole and the X axis is constrained toward sun direction (as viewed from the earth).

TopoCentric

Reports data about position covariance matrix including orientation of its principal axes relative to the TopoCentric axes and dimensions of the associated sigma scaled equal probability density ellipsoid. 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.

TrueOfOrbitEpoch

True equator and true equinox of the Earth at the orbit epoch. The orbit epoch is taken from the initial conditions of the satellite when possible, otherwise it is taken to be the time of the first ephemeris point.

VNC

Reports data about position covariance matrix including orientation of its principal axes relative to the VNC axes and dimensions of the associated sigma scaled equal probability density ellipsoid. 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.

VNC(CBF)

Reports data about position covariance matrix including orientation of its principal axes relative to the VNC(CBF) axes and dimensions of the associated sigma scaled equal probability density ellipsoid. 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.

VNC(Earth)

Reports data about position covariance matrix including orientation of its principal axes relative to the VNC(Earth) axes and dimensions of the associated sigma scaled equal probability density ellipsoid. 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.

VNC(Mars)

Reports data about position covariance matrix including orientation of its principal axes relative to the VNC(Mars) axes and dimensions of the associated sigma scaled equal probability density ellipsoid. 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.

VNC(Moon)

Reports data about position covariance matrix including orientation of its principal axes relative to the VNC(Moon) axes and dimensions of the associated sigma scaled equal probability density ellipsoid. 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.

VNC(Sun)

Reports data about position covariance matrix including orientation of its principal axes relative to the VNC(Sun) axes and dimensions of the associated sigma scaled equal probability density ellipsoid. 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.

VNC(Venus)

Reports data about position covariance matrix including orientation of its principal axes relative to the VNC(Venus) axes and dimensions of the associated sigma scaled equal probability density ellipsoid. 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.

VVLH

Reports data about position covariance matrix including orientation of its principal axes relative to the VVLH axes and dimensions of the associated sigma scaled equal probability density ellipsoid. 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.

VVLH(CBF)

Reports data about position covariance matrix including orientation of its principal axes relative to the VVLH(CBF) axes and dimensions of the associated sigma scaled equal probability density ellipsoid. 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.

VVLH(Earth)

Reports data about position covariance matrix including orientation of its principal axes relative to the VVLH(Earth) axes and dimensions of the associated sigma scaled equal probability density ellipsoid. 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.