LLA to ECEF Position
Transition from the geodetic coordinate system to the Greenwich coordinate system.
Description
The LLA to ECEF Position block implements the transition from the geodesic coordinate system to the Greenwich rectangular coordinate system by formulae:
where
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- is the radius of curvature of the first vertical;
-
- is the major semi-axis of the ellipsoid;
-
- eccentricity;
-
- ellipsoid compression.
An ellipsoid of rotation is used as an approximation to the actual shape of the planet. To use a spherical model of the planet, set the Flattening parameters to zero.
The Greenwich coordinate system is associated with the rotating planet. The origin is at the planet’s centre of mass. The axis is directed to the point of intersection of the Greenwich meridian with the equator, the axis coincides with the planet’s rotation axis and is directed to the North Pole, the axis completes the system to the right.
Ports
Parameters
Planet model - planet
Earth (WGS84) (by default) | Custom
Geodetic parameters of the planet. For the Earth the system WGS 84 is used.
Dependencies
Parameters Flattening and Equatorial radius of planet are available only when Custom option is selected.
Flattening - compression
1/298.257223563 (by default) | scalar
Compression of the planet ellipsoid.
Dependencies
To use this parameter, set the Planet model parameters to Custom.
Equatorial radius of planet - equatorial radius of planet
6378137.0 (By default) | scalar.
Equatorial radius of planet. Specified in the same units as the signal at the port input h.
Dependencies
To use this parameter, set the Planet model parameters to Custom.