Antenna Working Group Progress on recommendations made at the 2016 IGS workshop in Sydney, Australia Presented to the IGS Governing Board and Associate Members on 11 December 2016

Geoscience Australia is accepted to serve as an IGS antenna calibration facility. In order to guarantee unique IGS space vehicle numbers for GLONASS, GLONASS numbers "701..." (GLONASS-K) and "750..." (GLONASS-M) are converted to "R801..." and "R850...", respectively. The IGS starts to collect individual calibrations of antennas installed in the IGS network and makes them available for validation. The IGS encourages studies assessing their potential benefit for multi-year time series and products. Ralf Schmid Antenna Calibration Splinter Session Summary Recommendations

Progress since Sydney Two GLONASS satellites (R854, R855) renamed with igs08_1885.atx No progress on individual calibrations yet. Araszkiewicz and Voelksen (2016) found degradation for EUREF: increased annual signals and bigger jumps in time series (equipment changes) due to individual calibrations igs08.atx updated with estimated Galileo satellite antenna phase center offsets (Steigenberger et al. 2016) igs14.atx draft version prepared: z-offsets of all GPS and GLONASS satellites reestimated x-/y-offsets from pre-flight calibrations for Block IIR (Dilssner et al. 2016) receiver antennas: 17 additional robot calibrations; lots of updated type means

Future Work ANTEX format update on the horizon: group delay variations carrier-to-noise ratio MGEX-related and other issues Combined processing of terrestrial and LEO data needed to derive (azimuth-dependent) satellite antenna phase center corrections without fixing the terrestrial scale. Could start as soon as IGS14/igs14.atx is adopted

Contact: Ralf Schmid schmid@tum.de Thank You Contact: Ralf Schmid schmid@tum.de