用频域滤波和双PRF技术提高新一代天气雷达数据质量
Frequency Domain Filter and Dual PRF Improvement-DataQuality of SA Radar
中文摘要：
使用频域滤波和双PRF技术在Linux操作系统下进行了提高新一代天气雷达抑制超折射能力、减轻速度模糊及改进反射率/速度数据质量的研究工作，新的信号处理算法通过在天津和上海青浦SA雷达半年的业务运行，证明基于Linux操作系统的雷达控制软件的稳定性和对病毒的防疫能力优于基于Windows的。通过对实际观测资料分析得出：（1）频域滤波算法对超折射和地物回波有良好的抑制作用，而对天气回波的影响很小，性能优于现有SA的技术；（2）双PRF技术有效减轻了速度模糊，提高了速度场数据质量。上述研究结果不仅可直接应用于新一代天气雷达系统，还可应用于人工影响天气和山洪地质灾害项目中的X波段天气雷达。
中文关键词：
滤波，超折射，双PRF，速度模糊
KeyWords：
filter, anomalous refraction, dual PRF, velocity fuzziness
Abstract：
This paper examines the application research of frequency domain filter 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 reflectivity/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 filter has a strong function on anomalous refraction and ground echo wave with a minor influence 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 Modification and Mountain-Flood Disaster Forecast Project.