| X波段双极化多普勒天气雷达极限降水的估计能力 |
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| 引用本文： | 史朝,何建新,刘艳. X波段双极化多普勒天气雷达极限降水的估计能力[J]. 气象科学, 2010, 30(2): 245-249 |
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| 作者姓名： | 史朝 何建新 刘艳 |
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| 作者单位： | 1. 成都信息工程学院,大气探测重点实验室,成都,610225
2. 成都市气象局,成都,610000 |
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| 基金项目： | 国家高技术研究发展计划(863)项目，四川省青年基金项目 |
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| 摘 要： | 首先分析了X波段双极化多普勒天气雷达降水估计的误差来源及其影响,然后分析了信比、积累阶数对降水估计精度的影响,明确雷达系统本身的测量误差所能达到的理想程度,结果表明在双通道的积累次数M=64,信噪比SNR=10dB的条件下差分反射率的σ(ZDR)=0.32dB,则相应R(Z,ZDR)的降水估计精度最好能达到44%,同样条件下差分相位的σ(ΦDP)=0.08°,那么在降水率R=50mm/h时R(KDP)的降水估计精度最好能达8.6%。
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| 关 键 词： | 多普勒雷达 降水率估计精度 X波段 双极化 |
| 收稿时间： | 2008-01-10 |
Ultimate analysis of rainfall estimation from X-band dual-polarimetric Doppler radar |
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| Shi Zhao,He Jianxin and Liu Yan. Ultimate analysis of rainfall estimation from X-band dual-polarimetric Doppler radar[J]. Journal of the Meteorological Sciences, 2010, 30(2): 245-249 |
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| Authors: | Shi Zhao He Jianxin Liu Yan |
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| Affiliation: | Shi Zhao1 He Jianxin1 Liu Yan2(1 Key Laboratory of Atmospheric Sounding,Chengdu University of Information Technology,Chengdu 610225,China)(2 Chengdu Meteorological Bureau,Chengdu 610000,China) |
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| Abstract: | Sources of errors in rainfall observations by X-band polarization radar are introduced to analyze their relative importance. The ultimate accuracy of rainfall measurement is determined by signal to noise ratio(SNR) and samples number(M). Deduced results show that M=64 SNR=10 dB will determine σ(Z_(DR))=0.32 dB, accordingly, accuracy of R(Z,Z_(DR)) will reach at 44%. With same value of M and SNR, accuracy of differential phase σ(Φ_(DP)) will arrive at 0.08°,which will decide accuracy of R(K_(DP)) 8.6% while rainfall ratio R=50 mm/h. |
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| Keywords: | Doppler radar Rainfall estimation X band Polarization |
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