rootbrowseIAC-18B2session 55. Space-Based Navigation Systems and ServicesPapers1. Galileo Service Provision: One Year under GSA Responsibility2. Galileo Message and Signal Authentication services: A program and policy perspective3. Commercial Provision of Space-Based Automatic Identification System (SB-AIS) Data Services to the Canadian Government: Recent Experiences and Lessons Learned.4. Satellite Based ADS-B for Commercial Space Flight Operations5. The Multi-GNSS Space Service Volume6. MEOSAR-NG: a powerful new concept for Search & Rescue from MEO7. A CubeSat based GNSS Constellation for planetary Exploration8. optimization of low earth orbit satellite constellations for regional positioning9. Improved GNSS-based Orbital Filter for Earth to Moon Navigation10. investigation on sustaining the autonomous satellite navigation system using only inter-satellite links11. Advanced Navigation Augmentation System based on LEO Communication Constellation