When an UHECR enters the atmosphere, it emits a radio pulse which can be used for detection. The main problem of this new detection method is the poor signal to noise level. This thesis describes the development of an adaptive digital filter to remove radio frequency interference (RFI) in real-time, followed by a self trigger to reject transient noise. The system was implemented in FPGA hardware, tested, and commissioned in the frame of the AERA experiment at the Pierre Auger Observatory
