Geo++ has an excellent expertise in GNSS antenna and station calibration.
Geo++ has an excellent expertise in GNSS antenna and station calibration. This included the development of unique field experiment and measurement facilities for GNSS, which initiated broad scientific investigations and changes in modeling worldwide. The robot-based calibration system has been successfully realized in several collaborative research and funded research projects with the Institut für Erdmessung, Leibniz Universität Hannover.
The role of the GNSS site impact on GNSS performance is generally underestimated. The robot-based calibration system allowed for the first time to determine the effect of near-field reflectors on GNSS antennas. Today, it is commonly accepted to distinguish between antenna phase variations, near-field effects and far-field multipath. Geo++ researches documented the impact of unfavorable site setups (antenna and mounting) causing significant degradation of GNSS network rover performance. New technologies to enable operational station calibrations are under investigation at Geo++.
Such unfavorable station setups can be best avoided already in the phase of station selection and setup. Only in some limited cases corrections for the near-field effects can be determined. Geo++ experiences may help to decide on proper GNSS sites.