| 双偏振天气雷达同时收发模式的一种改进方法 |
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| 引用本文： | 梁海河,徐宝祥,刘黎平,葛润生.双偏振天气雷达同时收发模式的一种改进方法[J].大气科学,2006,30(4):635-644. |
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| 作者姓名： | 梁海河 徐宝祥 刘黎平 葛润生 |
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| 作者单位： | 中国气象局大气探测技术中心,北京,100081;中国气象科学研究院,北京,100081 |
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| 摘 要： | 目前,双偏振多普勒天气雷达的同时发射方式受到了普遍关注,作者针对该方式中偏振参量差分反射率存在较大误差的问题,研究了双发射通道相位差与差分反射率精度的关系,以及双通道发射功率差、接收机增益等对差分反射率的影响.在此基础上,给出了双偏振同时发射方式的一种改进方案,并讨论了该方案的优势和特点,设计了双偏振多普勒天气雷达同时发射方式下回波信号的处理框图.
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| 关 键 词： | 偏振雷达 同时发射 改进 信号处理 |
| 文章编号： | 1006-9895（2006）04-0635-10 |
| 收稿时间： | 2005-01-10 |
| 修稿时间： | 2005-01-102005-12-26 |
An Improved Method on the Simultaneous Transmission Scheme of Dual Polarimetric Weather Radar |
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| LIANG Hai-He,XU Bao-Xiang,LIU Li-Ping and GE Run-Sheng.An Improved Method on the Simultaneous Transmission Scheme of Dual Polarimetric Weather Radar[J].Chinese Journal of Atmospheric Sciences,2006,30(4):635-644. |
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| Authors: | LIANG Hai-He XU Bao-Xiang LIU Li-Ping and GE Run-Sheng |
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| Institution: | 1 Atmospheric Observation Technological Center of China, Beijing 100081 ;2 Chinese Academy of Meteorological Sciences, Beijing 100081 |
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| Abstract: | The simultaneous transmission scheme of dual polarimetric radar(PR) is now paid more attentions,but there is a bigger error on differential reflectivity in this scheme.The paper studies the relations between the phase difference of dual transmission port and the error of differential reflectivity,and the infections of dual transmission power and receiver gain distinction to differential reflectivity.In terms of the necessary of rainfall measurements and hydrometeor discrimination,an improved method for simultaneous transmission is advanced based on the theory study,and the simultaneous signal processing scheme is provided.This new improved method can increase the ability of measurements and discrimination via reducing differential reflectivity error through changing phase between H and V channels.This scheme has many advantages including:(1) improving measurement quality by changing phase between H and V channels,(2) enhancing SNR and signal intensity of weak echo in spite of co-polar or cross-polar port,(3) obtaining elliptic depolarization ratio(EDR),(4) transmitting linear,circular or elliptic polarization at different elevations in one volume scan,and(5) eliminating ferrite switch and phase alternation for different elevations.Polarimetric radar development is a complicated,synthetic and scientific subject,every polarimetric scheme has some advantages and disadvantages,therefore the goal of this thesis is to consider the theory and technology of PR confronted in China.This improved method should be further examined and developed in practice. |
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| Keywords: | polarimetric radar simultaneous transmission improved scheme signal processing |
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