Path Attenuation Estimates for the GPM Dual-frequency Precipitation Radar (DPR)

Estimation of path attenuation is a critical part retrieving precipitation parameters using measurements from the Dual-frequency Precipitation Radar (DPR) on board Global Measurement Mission (GPM) satellite. In this paper, we describe latest implementation surface reference technique (SRT) that uses scattering properties to infer through precipitation. Both single- and dual-frequency versions method are available although version appears be more accurate at moderate rain rates, single-frequency approach Ku-band needed when Ka-band data not available. Despite improvements afforded by method, other methods such as Hitschfeld-Bordan standard approaches offer advantages particularly lighter rates near-nadir incidence angles over land. Weighted averages results these appear best estimate presently