Extension and Optimization of the Local Geodetic Network at the Onsala Space Observatory

Paper in proceeding, 2019

Since May 2017, the Onsala Space Observatory (OSO) has hosted the Onsala twin telescopes (OTT), two identical telescopes fulfilling the VGOSspecifications. The local geodetic ground network has to be extended to the area around the OTT to provide local tie vectors for combining different geodetic space techniques at the observatory. Furthermore, this network is essential for monitoring the temporal and spatial stability of the new radio telescopes. Both network configuration and measurement uncertainties of the terrestrial observations have a strong impact on the obtainable accuracy of the reference points. Network optimization procedures help to avoid misconfigurations and provide suitable network configurations. For OSO, an extended ground network and an optimal observation schedule are derived that fulfill the accuracy requirements for monitoring processes. The observation schedule, derived by a second order design optimization, focuses on a practical experience when using modern geodetic instruments.