1. Combined BeiDou-2 and BeiDou-3 instantaneous RTK positioning: stochastic modeling and positioning performance assessment p. 7-24 2. Assessment of global ionospheric maps over continental areas using precise point positioning technique p. 25-39 3. Contribution of QZSS with four satellites to multi-GNSS long baseline RTK p. 41-60 4. Assessing the performance of multi-frequency GPS, Galil…