The Influence of Reradiation on the Phase Pattern of a Medium Wave Radio Navigation System Antenna

The transmitting antenna of a medium wave radio navigation system in the presence of a reradiating object is considered. The change in the phase radiation pattern under variations of the underlying ground surface parameters is analyzed. It is shown that the phase pattern non-uniformity can reach tens of degrees. A distortion compensation method is proposed using a phase pattern calibration that takes into account the influence of surrounding objects and a small calibration antenna that allows tracking of changes in ground parameters.