Use finite functions Kravchenko-Rvachev to describe the distribution statistics of refractive index

The efficiency of navigation, radiolocation and communication largely depends on the propagation of radio waves, which can be determined by the state of atmospheric refraction. Therefore, studying spatial and temporal distributions of the refractive index N and creating its statistical model are of great interest to predictions of the range of radio systems, as well as estimates of the accuracy of measuring the coordinates of GNSS. To experimentally study how the propagational conditions of radio waves influence the accuracy of measuring the coordinates, measuring points are set up in Kharkov, Poltava, Sumy, equipped with receiving equipments design Ltd. "Navis-Ukraine", measuring errors of estimating the coordinates around the clock. Measurements are accumulated by data of regular meteorological stations located in these cities, from which we calculated the values of the refractive index of troposphere.