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The SMAP RFI detecting digital backend performance is characterized using real-environment L-band RFI data from the SMAPVEX 2012 campaign. Various types of RFI signals are extracted from the airborne campaign dataset and fed to the SMAP radiometer using an Arbitrary Waveform Generator (AWG).The backend detection performance is tested, and missed-detections are further investigated.Initial results indicate RFI detection performance for the SMAP digital backend is acceptable.Index Terms -Microwave radiometer, radio frequency interference, SMAP