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According to the different time constraints for simulation tasks, a multi-level distributed real-time simulation platform was proposed, on which hardware layer was mainly introduced to solve rigorous real-time tasks. The distributed simulation framework under centralized management was given. Then, FPGA and DSP hardware boards were well designed. Especially, reflective memory network and bottom hardware communication were studied. An external clock synchronization module in FPGA was given to achieve microsecond precision. Also, data dispatch and simulation scheduling mechanism were elaborated. Finally, a real-time PD radar simulation system is developed as a typical application.