NDLI: Simulation of mono- and dual-wavelength airborne radar observations of precipitating systems at various frequency bands

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Simulation of mono- and dual-wavelength airborne radar observations of precipitating systems at various frequency bands

Content Provider	Semantic Scholar
Author	Louf, Valentin
Copyright Year	2013
Abstract	We address the question of the most efficient couple (f , θ3dB) for airborne radar precipitating system observations, where f is the microwave frequency and θ3dB the beamwidth aperture at 3 dB (θ3dB = 70λ/Da, Da is antenna diameter) (Skolnik 2008). This problem is of importance. The meteorological hazard in civil aviation is mainly due to convective precipitating systems, and particularly hail and strong turbulence areas. A realistic and flexible model of precipitating systems is presented and simulations of airborne radar observations are performed at the six meteorological frequency bands. In this work, the effect of f and θ3dB modification is shown through radar simulations of several precipitating systems. One is a numerical simulation composed of two successive rows of convective towers, another is inspired from NEXRAD data of a real mesoscale event of May 2, 2003 in Alabama (USA), presenting hailbearing convective towers. It is shown that some (f , θ3dB) couples are better than the one currently used by civil aviation. Notably C-band allows a better description than X-band of a meteorological radar scene, if the radar antenna size is increased. After that, we applied the dual-wavelength method to detect unambiguously hail in these precipitating systems. The question of the most efficient dual-wavelength couple is addressed by comparing several meteorological radar dualbands. Since hail reflectivity is strongly dependent on microwave frequency (Atlas and Ludlam 1961), an interesting method to improve hail detection in airborne radar is the dual-wavelength technique (DWT). As a non-Rayleigh scatterer at S, C, and X-
File Format	PDF HTM / HTML
Alternate Webpage(s)	https://ams.confex.com/ams/36Radar/webprogram/Handout/Paper228408/poster_confradar.pdf
Alternate Webpage(s)	https://ams.confex.com/ams/36Radar/webprogram/Manuscript/Paper228408/confradar36th.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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