Time-domain electromagnetic interference (EMI) measurement systems sample the broad-band EMI signal with GHz sampling rates and compute the EMI spectrum by digital signal processing. By suppressing ambient noise using methods based on adaptive filtering algorithms, measurements of electromagnetic interference of a device under test can be performed at a test site polluted with electromagnetic ambient noise. In this work we describe the application of a wideband time-domain direction of arrival (DOA) estimation method for separating the waves incident from various direction and by this way filtering ambient noise from the noise of the device under test.
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