Abstract:With the improvement of numerical prediction model resolution, more attention is paid to the balloon drifting deviation caused by radiosonde sounding and the precise algorithm of balloon latitude and longitude deviation. In view of the fact that the influence of earth curvature is ignored in the existing algorithm, a more precise algorithm is deduced based on the geocentric coordinate system, starting from the analysis of principles of the sounding system, compared with the original algorithm through radiosonde data files.