In this study, we investigate the effect of the radome joints on the measured polarimetric variables, particularly the differential reflectivity (ZDR) and the differential phase (PHIDP). We observe that the metallic bolts connecting the radome panels cause power loss at certain angles resulting in a bias in ZDR and PHIDP values. To correct for this bias, we have developed a novel algorithm based on Fast Fourier Transform and tested its performance during a heavy rainfall event caused by the Batsirai cyclone in La Reunion Island. The results show that our algorithm is effective in correcting the bias in polarimetric measurements. It will also be applied to other events in order to verify its all-around performance for routine implementation.

