WANG Xu,YANG Yufei,XIAO Xiao,et al.Research and Application of Algorithm for Mitigating DPRF Velocity Measurement Error in C-band Weather Radar[J].Journal of Chengdu University of Information Technology,2025,40(03):278-285.[doi:10.16836/j.cnki.jcuit.2025.03.004]
减轻C波段天气雷达DPRF测速误差的算法研究及应用
- Title:
- Research and Application of Algorithm for Mitigating DPRF Velocity Measurement Error in C-band Weather Radar
- 文章编号:
- 2096-1618(2025)03-0278-08
- 关键词:
- 天气雷达; DPRF; Savitzky-Golay滤波器; 径向速度; 误差校正
- Keywords:
- weather radar; DPRF; Savitzky-Golay filter; radial velocity; error correction
- 分类号:
- TN959.4
- 文献标志码:
- A
- 摘要:
- 多普勒天气雷达不存在一个PRF能同时最大化不模糊速度和不模糊距离,这就是“多普勒两难”问题。在研究和业务应用中,需要对雷达数据进行退距离折叠和速度模糊处理才能用于数值天气预报模型、观测分析以及恶劣天气探测。针对此问题,双脉冲重复频率(Dual-PRF,DPRF)算法使用两个不同的PRT依次采集两个均匀的时间序列,并组合根据每个时间序列估算得到的速度,获得一个新的速度估计值,这一估值对应着更大的最大不模糊速度,能够有效扩展测速区间,减少速度模糊现象。但是,使用DPRF算法在高切变区容易出现径向速度估计误差。基于线性插值和Savitzky-Golay滤波器创建平滑的多普勒径向速度,通过将每个距离库的径向速度与该平滑后的速度进行比较,识别错误数据,并根据特定的错误特征进行校正。使用中国云南昆明CINRAD/CC型雷达DPRF速度数据对该算法进行测试和分析,结果表明:该算法能够识别并校正DPRF中大部分的速度误差点,有效减轻DPRF的测速误差。
- Abstract:
- Doppler weather radar faces the "Doppler Dilemma" problem where there is no single Pulse Repetition Frequency(PRF)that can simultaneously maximize unambiguous velocity and unambiguous range. In both research and operational applications, radar data usually needs to undergo range folding and velocity aliasing processing to be used in numerical weather prediction models, observational analysis, and severe weather detection. To address this issue, the Dual-Pulse Repetition Frequency(DPRF)algorithm uses two different Pulse Repetition Times to sequentially collect two uniformly spaced time series and combines the velocity estimates obtained from each time series to obtain a new velocity estimate that corresponds to a larger maximum unambiguous velocity. This effectively extends the velocity measurement range and reduces velocity aliasing. However, using the DPRF algorithm can lead to estimation errors in radial velocity in areas with high variability. This paper presents a method based on linear interpolation and a Savitzky-Golay filter to create a smooth Doppler radial velocity. By comparing the radial velocity for each range gate with the smoothed velocity, erroneous data points are identified and corrected based on specific error characteristics. The algorithm is tested and analyzed using DPRF velocity data from the CINRAD/CC type radar in Kunming, Yunnan, China. The results show that the algorithm can identify and correct most velocity error points in the DPRF, effectively reducing the velocity estimation error associated with DPRF.
参考文献/References:
[1] Sirmans D,Zrnic D,Bumgarner B.Extension of maximum unambiguous Doppler velocity by use of two sampling rates(for meteorological pulse Doppler radar)[C].Conference on Radar Meteorology,17 th,Seattle,Wash,1976:23-28.
[2] Dazhang T.Evaluation of alternative-PRF method for extending the range of unambiguous Doppler velocity[C].22nd Conf.on Radar Meteor,1984:523-527.
[3] Joe P,May P T.Correction of dual PRF velocity errors for operational Doppler weather radars[J].Journal of Atmospheric and Oceanic Technology,2003,20(4):429-442.
[4] Holleman I,Beekhuis H.Analysis and Correction of Dual PRF Velocity Data[J].Journal of Atmospheric and Oceanic Technology,2003,20(4):443-453.
[5] 杨川,刘黎平,胡志群,等.C波段多普勒雷达双PRF模式速度混淆区识别和处理方法研究[J].气象学报,2012,70(4):875-886.
[6] 梁海河,张沛源,葛润生.多普勒天气雷达风场退模糊方法的研究[J].应用气象学报,2002,13(5):591-599.
[7] 肖艳姣,万玉发,王志斌.多普勒天气雷达双PRF径向速度资料质量控制[J].高原气象,2016,35(4):1112-1122.
[8] Altube P,Bech J,Argemí O,et al.Correction of dual-PRF Doppler velocity outliers in the presence of aliasing[J].Journal of Atmospheric and Oceanic Technology,2017,34(7):1529-1543.
[9] Alford A A,Biggerstaff M I,Ziegler C L,et al.A Method for Correcting Staggered Pulse Repetition Time(PRT)and Dual Pulse Repetition Frequency(PRF)Processor Errors in Research Radar Datasets[J].Journal of Atmospheric and Oceanic Technology,2022,39(11):1763-1780.
[10] 张磊,张继东,曹立新.利用双脉冲重复频率解速度模糊的初步探讨[J].新疆气象,2004(1):25-26.
[11] Savitzky Abraham,Golay M J E.Smoothing and Differentiation of Data by Simplified Least Squares Procedures[J].Analytical Chemistry,1964,36(8):1627-1639.
相似文献/References:
[1]王翔弘,何建新,王 旭,等.太原CINRAD/CC雷达与X波段雷达观测一致性分析[J].成都信息工程大学学报,2018,(03):236.[doi:10.16836/j.cnki.jcuit.2018.03.003]
WANG Xiang-hong,HE Jian-xin,WANG Xu,et al.Observation Consistency Analysis of the Taiyuan CINRAD/CCWeather Radar and the X-band Radar[J].Journal of Chengdu University of Information Technology,2018,(03):236.[doi:10.16836/j.cnki.jcuit.2018.03.003]
[2]王海江,刘玟宏,邓洋洋,等.S 波段多普勒天气雷达回波模拟[J].成都信息工程大学学报,2016,(01):12.
WANG Hai-jiang,LIU Wen-hong,DENG Yang-yang,et al.S Band Doppler Weather Radar Echo Simulation[J].Journal of Chengdu University of Information Technology,2016,(03):12.
[3]张 双,张福贵,杨金红.负仰角观测对新一代天气雷达( CINRAD)
探测降水的意义[J].成都信息工程大学学报,2016,(01):49.
ZHANG Shuang,ZHANG Fu-gui,YANG Jin-hong.The Significance of Negative Elevation Observation to the
Precipitation of the New Generation Weather Radar[J].Journal of Chengdu University of Information Technology,2016,(03):49.
[4]赵 亮.龙卷过程中雷达合成切变产品的分析[J].成都信息工程大学学报,2017,(03):269.[doi:10.16836/j.cnki.jcuit.2017.03.007]
ZHAO Liang.Analysis of Radar Composite Shear Products in the Process of Tornado[J].Journal of Chengdu University of Information Technology,2017,(03):269.[doi:10.16836/j.cnki.jcuit.2017.03.007]
[5]蒋秋菲,王 旭,何建新,等.天气雷达遮挡区域识别[J].成都信息工程大学学报,2017,(05):469.[doi:10.16836/j.cnki.jcuit.2017.05.001]
JIANG Qiu-fei,WANG Xu,HE Jian-xin,et al.Identification of Weather Radar Shielding Region[J].Journal of Chengdu University of Information Technology,2017,(03):469.[doi:10.16836/j.cnki.jcuit.2017.05.001]
[6]周淑玥,李 静,鲜 林,等.基于数字高程模型和反射率因子垂直廓线的天气雷达波束遮挡订正算法[J].成都信息工程大学学报,2023,38(05):497.[doi:10.16836/j.cnki.jcuit.2023.05.001]
ZHOU Shuyue,LI Jing,XIAN Lin,et al.Weather Radar Beam Block Correction Algorithm based on DEM Model and Vertical Profile of Reflectivity[J].Journal of Chengdu University of Information Technology,2023,38(03):497.[doi:10.16836/j.cnki.jcuit.2023.05.001]
[7]沈邦跃,何建新,曾强宇.基于超分辨率的相控阵天气雷达数据压缩算法[J].成都信息工程大学学报,2023,38(06):621.[doi:10.16836/j.cnki.jcuit.2023.06.001]
SHEN Bangyue,HE Jianxin,ZENG Qiangyu.Data Compression Algorithm of Phased Array Weather Radar based on Super Resolution[J].Journal of Chengdu University of Information Technology,2023,38(03):621.[doi:10.16836/j.cnki.jcuit.2023.06.001]
[8]许 洋,李学华,王 俊,等.基于AD9361的天气雷达回波模拟与硬件系统[J].成都信息工程大学学报,2024,39(03):283.[doi:10.16836/j.cnki.jcuit.2024.03.004]
XU Yang,LI Xuehua,WANG Jun,et al.Weather Radar Echo Simulation and Hardware System based on AD9361[J].Journal of Chengdu University of Information Technology,2024,39(03):283.[doi:10.16836/j.cnki.jcuit.2024.03.004]
备注/Memo
收稿日期:2023-11-29
基金项目:国家重点研发计划项目(2021YFC3090203)