Antarctic Balloon Measurements of UHE CR (SPHERE Experiment)

The preparations to the measurements of UHE CR on the base of Russian Antarctic Station Novolazarevskaja using detectors SPHERE-1 and SPHERE-2 are fulfilled now. In this connection Monte-Carlo simulation was applied to estimate the accuracy of reconstruction of the EAS arrival direction and the Cherenkov light lateral distribution measured using the SPHERE-1 and SPHERE-2 balloon borne detectors at a height of 1 km by EAS Cherenkov light reflected from the Earth snowed surface.