| A Velocity Dealiasing Scheme for C-band Weather Radar Systems简 |
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| 作者姓名： | LI Gang HE Guangxin Xiaolei ZOU Peter Sawin RAY |
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| 基金项目： | supported by the Ministry of Science and Technology of China under the 973 project“Assessment,Assimilation,Recompilation and Applications of Fundamental and Thematic Climate Data Records”(Grant No.2010CB951600);the National Science Foundation for Young Scholars of Jiangsu Province(Grant No.SBK201341084);the Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD) |
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| 摘 要： | A dealiasing algorithm for radar radial velocity observed by C-band Doppler radars is presented as an extension of an existing S-band dealiasing algorithm. This has operational significance in that many portable and many commercial broadcast radars, as well as approximately one half of the Chinese weather radar network （CINRAD）, are C-band radars. With a wavelength of about 5 cm, the Nyquist interval of C-band radars is just about one half that of S-band radars （wavelength of about 10 cm） and thus has more velocity folding. The proposed algorithm includes seven modules to remove noisy data, find the starting radials, dealias velocities, and apply least squares error checking in both the radial and azimuth directions. The proposed velocity dealiasing method was applied to one widespread rain case and three strong convective cases from radars operating in China. It was found that, on average, 92.95% of the aliased radial velocity data could be correctly de-aliased by the algorithm, resulting in 96.65% of the data being valid.
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| 关 键 词： | 天气雷达系统 径向速度 C波段 模糊 CINRAD 子午线轮胎 雷达观测 奈奎斯特 |
A velocity dealiasing scheme for C-band weather radar systems |
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| LI Gang,HE Guangxin,Xiaolei ZOU,Peter Sawin RAY.A velocity dealiasing scheme for C-band weather radar systems[J].Advances in Atmospheric Sciences,2014,31(1):17-26. |
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| Authors: | Gang Li Guangxin He Xiaolei Zou Peter Sawin Ray |
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| Affiliation: | 1. Center of Data Assimilation for Research and Application, Nanjing University of Information Science & Technology, Nanjing, 210044, China
2. Department of Earth, Ocean and Atmospheric Sciences, Florida State University, Tallahassee, FL, 32306-4520, USA
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| Abstract: | A dealiasing algorithm for radar radial velocity observed by C-band Doppler radars is presented as an extension of an existing S-band dealiasing algorithm. This has operational significance in that many portable and many commercial broadcast radars, as well as approximately one half of the Chinese weather radar network (CINRAD), are C-band radars. With a wavelength of about 5 cm, the Nyquist interval of C-band radars is just about one half that of S-band radars (wavelength of about 10 cm) and thus has more velocity folding. The proposed algorithm includes seven modules to remove noisy data, find the starting radials, dealias velocities, and apply least squares error checking in both the radial and azimuth directions. The proposed velocity dealiasing method was applied to one widespread rain case and three strong convective cases from radars operating in China. It was found that, on average, 92.95% of the aliased radial velocity data could be correctly de-aliased by the algorithm, resulting in 96.65% of the data being valid. |
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| Keywords: | Doppler radar aliasing radial velocity unfolding |
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