Vertical Distribution of Radio Meteorological M-curve for near the Snow-Covered Terrain

概要

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The variation of the equivalent reflection coefficient (ρe) is one of the most important factors which determine the properties of K-Type Fading at microwave propagation over snow-covered terrain. And ρe's physical meaning is somewhat complicated by the reason that it contains many factors (surface deposited snow's dielectric properties, radio meteorology, etc.). So we observed ρe's daily variation at the model propagation test (at very short distance 100m, 4000) and annexed the radio meteorological condition's measurements. This paper shows the method of this experiments and the analytic results on the radio meteorological M-curve (M-profile lies on the very low layer near upon the model test's reflection point). The vertical profiles of measured atmospheric temperature and M-curve are represented in Fig. 4 and ΔM (M-inversion) in Fig. 6 respectively. In general, the variation of ΔM is smaller than over the land and sea, especially at night time. So it is found that the dielectric properties of deposited snow at reflection surface had probably a pretty large influence on the variation of ρe.
社団法人日本雪氷学会の論文