Abstract:

A measurement method for adaptive interference suppression in on-site radiated emission test is proposed. Firstly, the method acquires multichannel data to achieve the signal directions of arrival (DOAs) of equipment under test (EUT) and interferences by the method of multiple signal classification (MUSIC) spatial spectrum estimation technique. Secondly, a wideband minimum variance distortionless response (MVDR) beam-forming algorithm combined with the short time Fourier transform (STFT) method is taken to form the beam pattern nulls in the directions of interference signals, thus to realize the suppression on interferences. The suppression effects on different kinds of interferences are simulated. The simulation results show that the method could simultaneously suppress multiple interferences, those are narrowband or wideband, continuous or transient, as well as with little distortion to the time-frequency characteristics of EUT’s signals.