In view of the disadvantages of the traditional satellite TT & C RF signal processing, such as the complicated process and the small number of channels, the RF digital technology is used to directly convert the signal between the up-down RF and the baseband, the design of the RF front-end is greatly simplified. The two-stage filtering mode is designed for the multi-channel wideband signal, which is suitable for the requirements of various satellite TT & C systems, and the Super Nyquist architecture is adopted, which effectively improve the front-end integration and reliability.