Add to ORKGDr. Gerhard Wübbena received his degrees in geodesy from the Universität Hannover. He has worked in the field of GNSS since 1983. In 1990 he founded the company Geo++®, which develops satellite navigation and positioning software and systems. Among these are the post-processing system GEONAP and the real time system GNSMART. Dr. Martin Schmitz received his degrees in geodesy from the Universität Hannover. He has been working in the field of GNSS for the industry and as a research fellow at the Universität Hannover since 1991. Both authors are currently employed at Geo++®. They are concerned with research and development in satellite positioning. Current projects focus on highly precise RTK phase positioning (GNSMART), absolute GNSS antenna...