SHI Wan-li,SHI Zhao,ZHENG Xiao-qing,et al.An Arithmetic to Enhancing the Detecting Ability of Dual Polarization Weather Radar for Weak Echoes[J].Journal of Chengdu University of Information Technology,2016,(02):152-155.
一种改善双极化多普勒天气雷达弱回波发现能力的方法
- Title:
- An Arithmetic to Enhancing the Detecting Ability of Dual Polarization Weather Radar for Weak Echoes
- 文章编号:
- 2096-1618(2016)02-0152-04
- Keywords:
- weather radar; coherent summation; weak echoes; detecting ability; SNR
- 分类号:
- TN959.4
- 文献标志码:
- A
- 摘要:
- 由于双极化天气雷达使用“双发双收”体制,即同时发送和接收水平、垂直通道的电磁波,这会导致双极化雷达在两个通道接收到的回波功率较单极化雷达至少小2倍(或3 dB)。一些信噪比较低的弱回波可能淹没在噪声里,不易被发现。为改善双极化多普勒天气雷达弱回波的发现能力,提出基于双通道信号相关性联合估测回波功率方法,并结合双极化雷达IQ数据进行相关的算法试验分析。结果表明,用基于信号相关求和算法能提高双极化天气雷达的回波信噪比3.77 dB,从而使雷达探测到更多的弱回波。
- Abstract:
- Because the dual polarization weather radar use polarimetric configuration with simultaneous transmission and reception of horizontally and vertically polarized electromagnetic waves. It lead to the transmitted power in each polarimetric channel two times or 3 dB lower than in the “legacy” single polarization channel. It is means that the weakest signals just above the noise level are lost in the polarimetric system. In order to improve the detecting ability of dual-polarization Doppler weather radar for weak echoes, this paper estimate the echo power based on coherent summation of two channel signals to enhance the detecting ability for dual polarization weather radar. And also do some experiment by using IQ data of dual polarization weather radar and analysis according to the coherent summation arithmetic. The result shows that using coherent summation arithmetic can enhance the SNR of weak echoes by 3.77dB for dual polarization weather radar. In this way, the radar can detect more weak echoes.
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备注/Memo
收稿日期:2016-01-14 基金项目:四川省教育厅资助项目(14ZB0174)