Case Analysis of Radar Attenuation Correction Based on Microwave Links
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Abstract:
Weather radar attenuation correction has a great significance in improving the accuracy of quantitative precipitation estimation. By using the new method of microwave links, a radar attenuation correction method based on microwave links is analyzed in this paper. The microwave links can measure the path attenuation directly, by which the constraint can be established, and weather radar echoes can be corrected by the forwarditerative correction algorithm. From the existing theories of attenuation correction, the weather radar attenuation correction model based on the microwave links by determining the microwave link attenuation reference, radar attenuation correction algorithm and attenuation coefficients is proposed. At last a 947 GHz microwave link measurement experiment system is established, and several automatic precipitation stations and a Xband weather radar are used for comparative observation. The results show that the corrected radar reflectivity factors are higher than the uncorrected factors obviously. The discrepancy between the rainfall derived from the corrected radar reflectivity and the rainfall observed by the automatic precipitation station is relatively small; the absolute deviation of precipitation accumulation is within 3 mm; the relative deviation is within 06%. The correlation coefficient is higher than before. The results validated the feasibility and accuracy of the above method. Using the microwave links on weather radar attenuation correction can effectively adjust the relationship between K and Z.
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Supported by:Beijing E-Tiller Technology Development Co., Ltd.
Supported by:Beijing E-Tiller Technology Development Co., Ltd.