Path Attenuation Estimates for the DPR

Meneghini, Robert ; Kim, Hyokyung ; Liao, Liang

关键词: ALGORITHMS;    DATA PROCESSING;    FREQUENCIES;    MULTISPECTRAL RADAR;    ATTENUATION;    RADAR ATTENUATION;    RAIN;    PRECIPITATION MEASUREMENT;    PRECIPITATION (METEOROLOGY);   

RP-ID  :  GSFC-E-DAA-TN75817

学科分类：大气科学

美国|英语

来源: NASA Technical Reports Server

【 摘 要 】

The algorithm for the Surface Reference Technique (SRT) has been updated from version V6A to version V6X. The modified algorithm is designed to process dual-frequency radar data which are now available over the full swath. Comparisons between V6A and V6X show that the dual-wavelength version of the SRT (DSRT) eliminates some of the overestimates of path attenuation in the outer swath that occurred in the earlier version of the algorithm when dual-frequency data was unavailable in the outer swath. However, the DSRT is not reliable in cases of light rain rates where only the Ku-band channel detects rain, nor is it reliable in high rain rate cases where the Ka-band surface signal is lost through attenuation. A modified hybrid algorithm is planned for version 7 that can combine the best features of single- and dual-frequency path attenuation methods.