Search

International audience; The paper presents the current status of adding geodetic capabilities to the European VLBI Network (EVN) software correlator at JIVE (SFXC), which is accomplished as part of the JUMPING JIVE project. Even though the EVN is not a geodetic array, there are many reasons why accurate radio telescope positions are desirable, including frequent observations using the phase-referencing technique to detect weak radio sources. Several changes were made at the SFXC so that the correlator can successfully correlate geodetic experiments. Detailed testing using data from the International VLBI Service for geodesy and astrometry (IVS) was performed to check the implementation. Additionally, a non-standard geodetic VLBI experiment was carried out at K-band (22 GHz) in June 2018 using 14 radio telescopes from the EVN. The purpose of this experiment was to determine accurate geodetic positions for those EVN telescopes that do not possess S/X receivers and hence do not participate in regular experiments organized by the IVS.The experiment was fully correlated with SFXC and exported into Mk4 format so that it can be further processed with standard geodesy software packages. That experiment is used as another means to demonstrate the full geodetic capabilities of the JIVE correlator.

International audience; This paper reports on the progress towards the implementation of a complete geodetic path for the EVN Software Correlator at JIVE (SFXC). It is con-ducted as part of the JUMPING JIVE project funded by the Horizon 2020 Framework Programme of the EU.JUMPING JIVE is dedicated to enhance the position of JIVE and the European VLBI Network (EVN) within the future of radio astronomy. This includes implementation of new capabilities, among which is the possibility to correlate geodetic-type experiments and export them in a standard fashion so that they can be further processed by the usual geodetic software packages.The implementation of this new capability requires (i)to make SFXC able to handle complex geodetic-like schedules with sub-netting, and (ii) to incorporate total quantities and measured phase-cal values in the data provided to the users. To facilitate post-processing, it was also decided to convert the correlator output to the standard geodetic Mark4 format. All such developments are now complete. To test the implementation,we have reprocessed IVS session R1872 and compared the output from SFXC with that obtained at the DIFX correlator in Bonn, where the session was originally processed. The methodology is explained here and partial results of the comparison are given. These indicate a 5.5 ps wrms for the Total Multiband Delay difference between the two correlators