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17 November 2000 Novel algorithm for tropospheric water vapor retrieval through multifrequency attenuation measurements at microwaves
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Abstract
Recent studies pointed out the correlation existing between the differential attenuation measurements, made using frequencies falling around the 22.235 GHz absorption line of water vapor, and the shape of the water vapor profiles. Such evidence induced us to develop a deterministically based profile retrieval procedure that exploits several differential attenuation measurements made at several frequencies around 22.235 GHz. In this paper, after having described the aforementioned deterministic procedure, a transmission system is proposed to obtain the differential attenuation measurements for a quasi-vertical satellite- Earth multifrequency link. Such transmission system is based on a sinusoidal amplitude modulation and a feasibility study about the minimum exploitable signal-to-noise ratio was considered as well. Both the retrieval procedure and the results of the feasibility study on the transmission system are then tested through simulations of multifrequency attenuation measurements. Such simulations are based on an atmospheric propagation model (MPM: Millimeter-wave Propagation Model) and on real radiosonde data providing profiles of temperature, pressure, and water vapor concentration.
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Fabrizio Cuccoli, Simone Tanelli, Luca Facheris, and Dino Giuli "Novel algorithm for tropospheric water vapor retrieval through multifrequency attenuation measurements at microwaves", Proc. SPIE 4125, Propagation and Imaging through the Atmosphere IV, (17 November 2000); https://doi.org/10.1117/12.409298
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