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Microwave link dual-wavelength measurements of path-average attenuation for the estimation of drop size distributions and rainfall

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2 Author(s)
Rincon, R.F. ; Dept. of Electr. & Comput. Eng., George Washington Univ., DC, USA ; Lang, R.H.

Microwave attenuation measurements at 25 and 38 GHz made on a 2.3-km microwave link are employed to estimate drop size distributions (DSD), rainfall rate, and rainfall accumulation. A theoretical model for the propagation of microwaves in a link system sets forth the basis for the development of a dual-wavelength analytical technique to invert two parameters of a path-average gamma DSD. The DSDs obtained from the technique are evaluated in conjunction with point measurements performed with a 2-D video disdrometer. Additionally, the DSDs yield path-average rainfall rates and rainfall accumulation which are compared with path-average measurements from a network of optical and tipping bucket rain gauges located beneath the link path, and with estimates based on empirical power law relations

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Geoscience and Remote Sensing, IEEE Transactions on  (Volume:40 ,  Issue: 4 )