X波段天气雷达雨区衰减订正方法分析

Study on Correcting Methods for Raining Signal Attenuation of the X-Band Weather Radar in Precipitation Area

文章首先采用标准大气衰减的模型对大气衰减进行订正,使降水测量的误差降低;然后采用降水对X波段电磁波的衰减模型,根据逐库订正原理,对雨区衰减进行订正,使降水测量的误差更加降低。试验结果表明,本方法能较好地恢复反射率强度和强降水的中心位置,具有一定的可行性。

Accurate measurement of precipitation is very important for agriculture,hydrology,natural disaster prevention and mitigation.Weather Radar can be used to monitor the intensity and area of precipitation.Generally,the measured amount of precipitation of the Weather Rader X-band is estimated lower than actual amount of rainfall,due to the attenuations of electromagnetic wave propagation which affected by rainfall.In order to obtain accuracy of the rainfall measurements,firstly,we employ the Standard Attenuation Model（SAM）for correcting the atmosphere attenuation of radar reflectivity on X-Band.Then,we utilize the SAM to adjust the rainfall attenuation data.After that,deviations of the precipitation measurements become smaller than before.Furthermore,the bin-by-bin algorithms for correcting electromagnetic wave deviation of the SAM were used to revise the rain area further.The results indicate that the method is feasible and can efficiently recover the reflectivity strength and the position of the strong precipitation center as well.