From the actual perspective of working principle of localizer beacon subsystem of Instrument\nLanding System (ILS), consideration of the distance information from localizer antenna to field\nmonitor antenna and wide aperture effect of localizer antenna, broke through the limitation of\nsignals synthesized only far-field (FF), established the near-field (NF) model. The three-dimensional\nmathematical model of localizer beacon was designed, and the signals at both near-field and\nfar-field were analyzed qualitatively. At the environment of Antenna Fault as well as Antenna\nDistribution Unit (ADU) phase shifter simulation, the characteristics of near-field and far-field\nwere also compared. The simulation results showed that the model met the requirement of theory\nof localizer beacon, and the gap between two models was so evident, which resulted from the\nbroken geometric symmetry in NF area. The model could provide valuable theoretical basis for\nperformance evaluation and maintenance of the ILS, and meanwhile, provide reference for the\nfurther analysis of localizer beacon.
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