Abstract: To study the dual PRF technology of CINRAD/SA weather radar, an end to end I/Q signal simulation algorithm was developed using an atmosphere layered model. The I/Q signal was generated and its reliability was verified. The appraisal precision of the FFT algorithm and PPP algorithm under unfolded, folded in low PRF and folded in high PRF was compared. The velocity was unfolded with the original standard algorithm and the new algorithm. Statistical analysis results show that, the velocity details can be well described by the end to end simulation algorithm. When velocity folded, the accuracy of the PPP algorithm is better than the FFT algorithm. Meanwhile the accuracy of the new algorithm is better than the original standard algorithm, and is equivalent with the PPP algorithm.