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In order to meet the simulation needs of LEO satellite payload test for flexible configuration and small size broadband signal, using the AD9361 and Zynq-7000 constitutes a signal simulation system, AD9361 RF agility chips have broadband, small features, based SOC architecture design Zynq-7000 running the Linux operating system, can complete LEO satellite orbit position, speed and satellite Doppler value of the received signal is calculated, Zynq-7000 using register to realize AD9361 RF agile chip configuration parameters while the received signal Doppler value calculation results in real time AD9361 RF AXI bus set parameters to achieve agility LEO payload of the received signal simulation. Papers are presented based on Zynq-7000 under Linux operating system real-time orbit parameters and parameter calculation of process and results, testing AD9361 RF agile chips to simulate the performance parameters of low Earth orbit satellite receives signals.