RASFX and DiFX: The Comparison of Geodetic VLBI Processing Results

Abstract

In this work we present the comparison of group delays obtained by RASFX and DiFX correlators using different post-processing software. We found that the difference of the group delays from both correlators are mainly due to the different mathematical implementation of the correlation and post-processing algorithms. The data converter software have been developed which allows to use PIMA post-processing routine on RASFX correlator data instead of the native RASFX post-processing software WOPS. A series of intensive VLBI sessions were processed using this new approach.