rootbrowseIAC-15B2session 33. Space-Based Navigation Systems and ServicesPapers2. Weak GNSS Signal Navigation in Lunar Missions3. Relative Navigation of GEO Satellites in Formation Using Double-Difference Carrier Phase Measurements with Integer Ambiguity Resolution4. Galileo FOC – Design, On-Orbit Operations & Performance5. Designing the next Generation of GNSS: How to best serve the diverse Interests of military, civilian and pubclic Users6. The Italian approach on GNSS Train Control and Management systems, Challenges for a Global Service7. Design of GNSS-based M2M Early Warning System for Improvement of Reachability of Information8. Clock synchronization and RF synthesis9. Combined Attitude-Orbit approach for Navigation and Stationkeeping of a precision beam forming Constellation10. System Design of LEO Spacecraft Position Determination Based on GNSS and GEO Data Broadcast Satellite11. Analysis of signal Availability in the GNSS Space Service Volume12. Configuration Keeping Optimization of Compass Constellation IGSO Satellites13. Results from the GNSS Flight Experiment on the Circumlunar Free Return Trajectory of China CE-5T1 Spacecraft