Journal of Arid Meteorology

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Comparison of Radial Interference Echo Removal Methods for Weather Radar

  

  • Online:2017-06-26 Published:2017-06-26

天气雷达径向干扰回波去除方法的比较

杜言霞1刘光普2邱光敏3吴勇凯1   

  1. 1.福建省泉州市气象局,福建泉州362000;2.福建省气象局,福建福州350001;
    3.福建省武平县气象局,福建武平364300
  • 作者简介:杜言霞(1983- ),男,工程师,主要从事大气探测技术保障工作. E-mail:277618620@qq.com

Abstract:

Based on the SA Doppler weather radar data, the filtering method, the interpolation method and the power method were used to eliminate the radial interference echo, and the removal efficiency of the three methods was analyzed and compared. The results are as follows: (1) The filtering method was suitable for the radial interference echo removal under clear sky condition, but the efficiency was poorer under precipitation condition, especially in the areas where the radial interference echo mixed with the precipitation echo. (2) If the radial interference echo existed in a single azimuth, the interpolation method was useful, when it existed in several directions, the efficiency was poorer. (3) By processing the received power of radar, the power method could effectively identify and remove the interference echo which existed in continuous multi directions or the overlap area of radial interference echo and precipitation echo. In the case of precipitation, the weaker the precipitation echo was, the stronger the interference correction was, otherwise, the weaker the interference correction was. If the sky was clear, the radial interference echo was completely removed.

Key words:  Doppler weather radar, radial interference echo, removal, comparison

摘要:

基于SA多普勒天气雷达资料,使用滤波法、插值法和功率法对径向干扰回波进行剔除,并对3种方法的去除效果进行对比。结果表明:(1)滤波法适用于晴空径向干扰回波的去除,在有降水特别是降水回波与干扰回波混合的区域滤波法效果较差;(2)若只有单一方位存在径向干扰回波时使用插值法去除回波效果较好,而多个方位存在干扰回波时插值法效果较差;(3)功率法通过处理雷达接收功率,对连续多方位存在的干扰回波,以及径向干扰回波与降水回波重叠的情况,都有较好的识别及去除干扰回波的效果。在有降水时,降水回波越弱,对干扰的订正越强;降水回波越强,对干扰的订正越弱;晴空时,径向干扰回波基本被全部去除。

关键词: 多普勒天气雷达, 径向干扰回波, 去除, 对比