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Proceedings Paper

The effects of the liquid water presence on the NDSA method for the measurement of the tropospheric water vapor along LEO-LEO satellite links
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Paper Abstract

The NDSA (Normalized Differential Spectral Absorption) method has been proposed for estimating the total content of water vapor (IWV, Integrated Water Vapor) along a tropospheric propagation path between two Low Earth Orbit (LEO) satellites. This method requires a transmitter onboard the first LEO satellite and a receiver onboard the second one. It is based on the simultaneous measurement of the total attenuation at two relatively close frequencies in the Ku/K bands, and on the estimate of a parameter referred to as 'spectral sensitivity'. This approach is potentially able to emphasize the water vapor contribution, to cancel out all spectrally flat unwanted contributions and to limit the impairments due to tropospheric scintillation. The objective of this paper is to analyze the effects of liquid water presence along the propagation LEO-LEO link on the NDSA approach. Results are based on computer simulation and account for different frequency carriers in the 15-30 GHz range and for any value of liquid water content along the propagation path at 3 km tangent altitude.

Paper Details

Date Published: 1 November 2005
PDF: 9 pages
Proc. SPIE 5979, Remote Sensing of Clouds and the Atmosphere X, 59790P (1 November 2005); doi: 10.1117/12.626997
Show Author Affiliations
Fabrizio Cuccoli, CNIT (Italy)
Univ. degli Studi di Firenze (Italy)
Luca Facheris, Dept. of Electronics and Telecommunications (Italy)
Univ. degli Studi di Firenze (Italy)


Published in SPIE Proceedings Vol. 5979:
Remote Sensing of Clouds and the Atmosphere X
Klaus Schäfer; Adolfo T. Comerón; James R. Slusser; Richard H. Picard; Michel R. Carleer; Nicolaos Sifakis, Editor(s)

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