Abstract: This paper examines the application research of frequency domain fi lter and Dual Pulse Repetition Frequency (DPRF) techniques under Linux operating system which enhance the ability of rejecting anomalous refraction, easing velocity fuzziness and the improvement of re fl ectivity/velocity data quality of CINRAD/SA Weather Radar. By operating the new signal processor on SA radar in Tianjin and Qingpu District of Shanghai for half a year, it is proved that the stability and the anti-virus ability of radar control software under Linux system surpass those operated under Windows system. It can be concluded by analyzing the real data that (1) Frequency domain fi lter has a strong function on anomalous refraction and ground echo wave with a minor in fluence on radar echo which shows that the performance is better than current SA technology; (2) DPRF effectively mitigates velocity fuzziness and improves velocity field quality. The above results can not only be applied to the weather radar of a new generation but also an X-band Doppler weather radar for Weather Modi fi cation and Mountain-Flood Disaster Forecast Project.