Showing papers by "Matsuo Sekine published in 1987"
TL;DR: In this paper, rain attenuation from 1 to 1000 GHz was calculated by using both log-normal and Weibull distributions for raindrop size and the results were compared with the recent microwave measurements from 8.4 to 312.5 GHz at the rain rate R = 50 mm/h.
Abstract: The rain attenuation from 1 to 1000 GHz was calculated by using both log-normal and Weibull distributions for raindrop size. The results were compared with the recent microwave measurements from 8.4 to 312.5 GHz at the rain rate R = 50 mm/h. The log-normal distribution leads to a higher estimate of attenuation than both the Weibull distribution and the experimental data.
38 citations
TL;DR: In this paper, the authors found that most of the clutter received by an L-band air route surveillance radar obeys Weibull distribution with various values of the shape parameters.
Abstract: Most of the clutter received by an L-band air route surveillance radar obeys Weibull distribution with various values of the shape parameters. The L-band radar has a frequency of 1.3 GHz and pulsewidth of 3 μs. Hence, the spatial resolution is as large as 450 m. The X-band radar, on the other hand, ns. frequency of 9.4 GHz and pulsewidth of 80 ns. The spatial resolution is as small as 12 m; we have found that the clutter amplitude distribution obeys a composite Weibull distribution when reflectors are ordinary terrain and such structures as buildings. Clutter suppression techniques for Weibull and non-Weibull echos are proposed.
3 citations