雷达定量估测区域降水波束阻挡系数的计算

The Calculation of Beam Blockage Coefficients in Estimating Regional Precipitation with Radar

提出了计算波束阻挡系数的平均值距离库填充法。利用以合肥雷达站为中心的数字高程模式资料 ,对平均值法与最大值法进行了比较。结果表明 :平均值法计算的波束阻挡系数小于最大值法的计算结果 ,且使波束受阻补偿值每距离库最大减小2 d BZ、使复合扫描结构中 (67km以外 )采用 1 .5°仰角的距离库数减少了 44%、对输入资料精度的要求从 1 :2 5万降低到 1 :50万。

A method for calculating the beam blockage coefficients is suggested,which uses the average value in a range bin to calculate the beam blockage coefficients.By processing the E00 terrain data of Hefei,comparisons between the average value method and the maximum value method has been made.Results show that the beam blockage coefficients calculated by the average value method are smaller than those by the maximum value method;the maximum reduction of the partial occulation correction of each range bin reaches 2dBZ;the number of range bins of 1.5 degree in the construction of the hybrid scan decreases by 44%;and the accuracy demand of input terrain data also decreases from 1:250000 to 1:500000.