22 December 2004 LEO-LEO Satellite microwave attenuation measurements for atmospheric water vapor retrieval: the DSA approach
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Abstract
A new differential measurement concept is presented for retrieving the total content of water vapor (Iwv, Integrated water vapor) along the propagation path between two Low Earth Orbiting (LEO) satellites, while such path is immersing in the atmosphere during a so called set occultation. This new approach, referred to as DSA (Differential Spectral Absorption) method, is based on the simultaneous measurement of the total attenuation at two relatively close frequencies in the K band, and on the estimate of a "spectral sensitivity parameter" that is highly correlated to the Iwv content of the LEO-LEO link in the low troposphere. The DSA approach has the potential to overcome all spectrally 'flat' and spectrally correlated phenomena, including atmospheric scintillation, but a very appealing aspect is the aforementioned correlation, on which we focus in this paper, taking into consideration signals at 17 and 20 GHz, and verifying how the correlation between Iwv and spectral sensitivity changes with season, latitude and inhomogeneity of the atmosphere.
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Luca Facheris and Fabrizio Cuccoli "LEO-LEO Satellite microwave attenuation measurements for atmospheric water vapor retrieval: the DSA approach", Proc. SPIE 5654, Microwave Remote Sensing of the Atmosphere and Environment IV, (22 December 2004); doi: 10.1117/12.580568; https://doi.org/10.1117/12.580568
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