antenna phase correction

A correction factor used for the variation in the antenna phase center location for a GNSS antenna resulting from the changing direction of the satellite signal.

The location of the phase center for a GNSS antenna is neither a physical nor a stable point. Instead, it varies with the changing direction of the signal from a satellite. Most of the phase center variation depends on satellite elevation. Correcting for this variation in the GNSS antenna phase center location allows a variety of antenna types to be used in a single survey. Antenna phase center corrections are not as critical when two antennas of the same type are used since common errors cancel out.