Analysis of cross-beam resolution effects in rainfall rate profile retrieval from a spaceborne radar

摘要

The performance (stability and accuracy) of a range profiling algorithm (kZS), using the measurement of surface echo as a constraint on total path integrated attenuation, for rainfall retrieval from a spaceborne radar was presented and discussed by C. Matzler (1987). Omitting other causes of errors previously examined, the present authors focus specifically on possible bias due to nonuniform beam filling effects. This problem is studied analytically to identify the physical origin of the biasing terms. In addition, bias in rainfall profile estimates is quantified through simulations of Ku-band spaceborne radar data processing, featuring the intercept of a raincell model by the downward looking radar beam.