name: ECEF
full_form: Earth-Centered, Earth-Fixed
context: is the estimate of the user location. e) Calculate the WLS solution according to [16]: f) Adding the to the initial state estimate gives an improved estimate of the state vector: . 5) This new state vector can be used as new initial estimate and the procedure is repeated until the change in is sufficiently small. Step 5: Transformation from Cartesian coordinate system to Geodetic coordinate system The state vector calculated in Step 4 contains the UE position in ECEF Cartesian coordinates together with the UE receiver clock bias relative to the selected GNSS system time. Only the user position is of further interest. It is usually desirable to convert from ECEF coordinates xu, yu, zu to geodetic latitude ï , longitude ï¬ and altitude h on the WGS84 reference ellipsoid. Step 6: Calculation of "2-D Position Errors" The latitude / longitude ï¬ï obtained after Step 5 is used to calculate the 2-D position error.
description: ECEF (Earth-Centered, Earth-Fixed) is a Cartesian coordinate system with its origin at the center of the Earth. It is used as a reference frame for determining the location of objects on or near the Earth's surface. In telecommunications, ECEF coordinates are used to calculate user equipment (UE) position and transform it into geodetic latitude, longitude, and altitude.
explanation: ECEF is classified as a Coordinate System because its primary function is to define and represent locations in three-dimensional space using a specific set of axes and origin. This aligns with the core purpose of coordinate systems in various fields, including telecommunications.
section_title: F.3	Weighted Least Squares (WLS) position solution
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