Digital methods of RFI mitigation in radio astronomy

We describe a new spectropolarimetric receiving complex for solar observations with the RATAN-600 radio telescope in the decimeter wavelength range. The use of a high-speed ADC and FPGA-based design of the DSP section made possible the direct detectorless reception and processing of radio frequency signals. The complex makes use of a method of radio frequency interference (RFI) mitigation based on the statistical properties of the received noise signal. We provide a brief description of the method, as well as details of the receiving system design, and give an example of the handling of data obtained from solar observations.