ANTENNA FAULT DETECTING METHOD

摘要

PURPOSE:To accurately detect an antenna fault by removing an undesired signal from a reflection signal including the undesired signal and detecting the fault of the antenna and its power supplying system or the abnormality of adjustment state from the amplitude of a detecting signal by obtained required reflection signal. CONSTITUTION:A signal distributer 9 extracts a part of a signal (undesired signal) of a transmitter 7. Then a phase shifter 10 and an attenuator 11 are adjusted to obtain signal vector 26 so that the input signal B of a signal synthesizer 12 is just equal to the amplitude of the reception signal component included in the input signal A and the phase is opposite. Since the detector 5 can obtain a detection output voltage composed of a required reflection signal where the effect of undesired reception signal is removed, the decision of the fault of the antenna is implemented accurately.