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The Murchison Widefield Array (MWA) is a new low-frequency interferometricradio telescope built in Western Australia at one of the locations of thefuture Square Kilometre Array (SKA). We describe the automated radio-frequencyinterference (RFI) detection strategy implemented for the MWA, which is basedon the AOFlagger platform, and present 72-231-MHz RFI statistics from 10observing nights. RFI detection removes 1.1% of the data. RFI from digital TV(DTV) is observed 3% of the time due to occasional ionospheric or atmosphericpropagation. After RFI detection and excision, almost all data can becalibrated and imaged without further RFI mitigation efforts, includingobservations within the FM and DTV bands. The results are compared to apreviously published Low-Frequency Array (LOFAR) RFI survey. The remotelocation of the MWA results in a substantially cleaner RFI environment comparedto LOFAR's radio environment, but adequate detection of RFI is still requiredbefore data can be analysed. We include specific recommendations designed tomake the SKA more robust to RFI, including: the availability of sufficientcomputing power for RFI detection; accounting for RFI in the receiver design; asmooth band-pass response; and the capability of RFI detection at high time andfrequency resolution (second and kHz-scale respectively).

The low-frequency environment of the Murchison Widefield Array: radio-frequency interference analysis and mitigation