177,251 research outputs found
ROBERTO NEBULONI, Riflessività e coscienza simbolica, a cura di F. Botturi e V. Melchiorre, Vita e Pensiero, Milano 2006
No full textRecensione a R. NEBULONI, Riflessività e coscienza simbolica, a cura di F. Botturi e V. Melchiorre, Vita e Pensiero, Milano 200
Rainfall detection by tomographic inversion of commercial radio link data: a pilot project in Italy
No full textQuantifying Bird Migration by a High-Resolution Weather Radar
No full textWe propose a bird detection and count algorithm designed to work with radar maps of PPI type. The spatial arrangement of birds is modeled according to the Poisson distribution. It is possible to handle a non-uniformtarget distribution both on the vertical and on the horizontal plane. The method is applied to measurements carried out by an S-band Doppler weather radar located on the South side of the Alps. Quantitative estimates are given for the distribution of bird volume density with height,
for the cumulative density (integrated over height), and finally for the daily migration traffic rate of nocturnal migrants over an area of about 2000 square kilometers
Characterization of the indoor-to-outdoor wireless channel in air-to-ground communication systems
No full textWireless communication between User Terminals (UTs) inside a building and an outdoor base station mounted onboard an unmanned aerial vehicle (UAV) is receiving a higher interest in emergency management scenarios and where users require on demand high throughput services. In such applications, a fundamental aspect is the thorough characterization of the propagation environment through parameters such as the UTUAV distance and the number of walls and floors crossed. In this paper, we characterize the indoor-to-outdoor wireless channel by using a commercial ray-tracing software. The reference scenario is a four-floor building. The UTs are uniformly distributed within each floor and two UAV positions are considered nearby the building. As a main contribution, we present numerical results in terms of path loss against the UT-UAV distance. The dependence of the path loss on the number of floors between the UT and the UAV is highlighted as well. Finally, the ray-tracing results are compared with those predicted by a few available propagation models
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