Fig. 2

Processing of quasar and lunar observations from the OCEL sessions. The schematics depicts a four-step processing chain used to obtain lunar geodetic VLBI observables and determine lunar-based parameters. All observations are correlated using DiFX 2.40 (Deller et al. 2011). The fringe search is performed using Fourfit for both quasar and lunar observations. In Step III, \(\nu\)Solve (Bolotin et al. 2014) is used in order to resolve ambiguities and derive ionosphere delays for quasar observations. The parameter estimation is carried out in the last step where c5++ (Hobiger et al. 2010) is utilized both for quasar and lunar observations