Research on Digital Beamforming Technology in Satellite Communication
Focusing on the engineering application of agile satellite digital multi-beam phased arrays,the discussion centers on dig-ital channelization technology based on multi-phase Fast Fourier Transform(FFT)and digital beamforming principles based on two-di-mensional FFT,specifically addressing the multi-beam frequency division multiple access communication system used in communication satellites.A 20 MHz bandwidth array receiver model was designed to process signals from different users by routing them through corre-sponding sub-channels,thereby enabling real-time interception,deceleration,and frequency conversion of multiple simultaneously arriving signals.This model was successfully integrated into a 2×2 array Digital Beamforming(DBF)multi-beam module,achieving du-al-domain filtering effects in both the time and spatial domains.Further validation through Matlab,SysGen,and Field-Programmable Gate Array(FPGA)multi-platform simulations confirmed the accuracy and effectiveness of the model.Simulation results show that un-der the condition of a 15 dB signal-to-noise ratio,the generated beam can fully cover the entire area where the user terminals are loca-ted,ensuring comprehensive communication coverage,and the transmission bit error rate is zero.
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