Medium Wave Terrestrial Radio Navigation Systems Antenna Radiation Pattern Distortions Due to Multipath Propagation

Modelling of multipath signal propagation at 1.9 MHz has been carried out for different locations of reradiating objects relative to the transmitting antenna. Objects in the form of a vertical rod, a mast, a flat screen and towers of various shapes are considered. It has been shown that distortions of the phase radiation pattern of more than 10 degrees can appear at distances between the reflecting object and the antenna up to 500 m or more. The object height and shape are of great importance.