ВЛИЯНИЕ АТМОСФЕРЫ НА ИССЛЕДОВАНИЯ ПЕРЕСЕЧЕННОГО РЕЛЬЕФА МЕТОДАМИ РАДАРНОЙ ИНТЕРФЕРОМЕТРИИ

Abstract

An influence of the atmosphere on the interferometric studies of the rugged terrain in the area of Tolbachik volcanic complex, Kamchatka, is discussed. Brief description of the radar interferometry technique and the components of the interferometric phase differences are presented. The two-component model of the troposphere is described, which assumes the decomposition of the refractive index into dry and wet components. An influence of the variations of the troposphere refractive index between radar observations on the phase measurements is simulated. The weather data of Klyuchi meteorological station were interpolated to the moments of the Canadian synthetic aperture radar «Radarsat-2» observations in summer-autumn 2013 and used as input data in the modeling. In the number of cases the calculated differential radar interferograms contain non-zero values of the phase difference that grow with the height of the relief. The non-zero phase differences observed on the interferograms are typically in the good agreement with simulation results. A noticeable discrepancy between interferometric measurements and simulation data occurs in the case of unstable weather with sharp alteration of relative humidity in the survey area, especially in the case the troposphere meteorological parameters vary in different directions during the radar observations. An assumption is made that the reason of the observed modeling errors is that the weather data of distant meteorological station do not match sometimes the actual weather conditions in the study area. The impact of variations of the refractive index between radar observations is less, the less the variations of the relief heights in the survey area.