Error analysis of non-spherical raindrops on precipitation measurement

Radar cross section (RCS) of non-spherical raindrops is calculated by using the software CST based on finite integral method and compared with RCS of spherical raindrops.The Accepted factor of non-spherical raindrops is obtained.The radar reflectivity with precipitation change of four distribution models of M-P, Gamma, JD and JT combining the Accepted factor is gotten using trapezoidal integration.When the influence of non-spherical raindrops is considered, the accuracy of precipitation measurement of four distribution models can be separately improved 8.77%, 8.47%, 10.53% and 8.04% in the case of rain intensity is 100 mm/h.