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L-band radio frequency is in the range of 1 GHz~2 GHz，which is widely used in rader, communication and navigation. The main research content of this paper is to design an L-band broadband, high dynamic RF digital receiver using RF digital receiver demodulation technology. In this paper, the design of L-band RF digital receiver is research at RF sampling, digital channel separation, receiver dynamic expansion and high-speed signal demodulation, and give a specific implement scheme of digital channel separation, high-speed signal demodulation based on FPGA digital signal process platform.