有朋自远方来，不亦乐乎 ! “ How happy we are, to meet friends from afar!” - Confucius Welcome to Stanford!

1. 有朋自远方来，不亦乐乎!“How happy we are, to meet friends from afar!”- ConfuciusWelcome to Stanford!

2. From Current GNSS Signal Observations to a Future Global Network of Civil MonitoringGrace Xingxin Gao/高醒心 (with the help of many)Stanford UniversityFor the Civil Aviation Administration of China

3. L-band Feed Current: Stanford GNSS Monitor Station (SGMS) with 1.8 m Dish Antenna Cavity Filter Low NoiseAmplifier 15 m cable 45dB Azimuth/Elevation Control • On-demand operation • 1.8 m steerable dish antenna • High gain • Directional • Flexible data collection system Agilent Vector Signal Analyzer (VSA) Nova for Windows Satellite Tracking Software

4. Using SGMS to Analyze GNSS Signals • Observe frequency spectra • Study signal structures • Analyze interoperability issues GNSS Frequency Plan

5. Compass-M1 Observations • First satellite Compass-M1 launched on 4/14/2007 • Second satellite Compass-G2 launched on 4/14/2009 E5b PSD (dB/Hz) E6 PSD (dB/Hz) E2 PSD (dB/Hz) frequency (MHz)

6. GPS IIR-20 Observations • GPS IIR-20 (SVN 63) is the first GPS satellite with L5 payload • GPS IIR-20 was launched on 3/24/2009, and L5 transmission was turned on 4/10/2009 L5 PSD (dB/Hz) L2 PSD (dB/Hz) L1 PSD (dB/Hz) frequency (MHz)

7. Access to Other Facilities SRI 45.7 m radio telescope antenna in the Stanford hills, Stanford, California ITS 20 m parabolic antenna, Table Mountain, Colorado

8. Signal Observations from Stanford SRI Dish and Table Mountain Dish Signal observations on the first day of GPS IIR-20 L5 turn-on A full spectrum of all GPS frequency bands captured by the 20m dish at Table Mountain A clean L5 spectrum captured by the 45.7m SRI dish

9. Vision – a Global Monitoring Network for Evaluating ARAIM Prototyping the Integrity Machine of the Future: Civil Monitoring Testbed

10. Testbed Architecture Space Segment (GPS, WAAS, Compass, Galileo, GLONASS) Control Segment (e.g., SGMS) User Segment (e.g., NSTB Sites)

11. Phase I: SU ARAIM Prototype Plan Integrity Monitoring Based on ARAIM (User Segment) Multi-constellation multi-band receiver ARAIM implementation SV signal-in-space error analysis Trigger Display & GUI Automatic data logging Post-processing investigation SGMS 1.8m dish Anomaly Investigation (Control Segment)

12. Phase II: Civil Monitoring Testbed Roll-out Global testbed for ARAIM evaluation Incorporate other sites: FAA TC, DLR (Germany), NCKU (Taiwan), perhaps CAAC ATMB and many others.

13. Acknowledgments • Collaborators within the GPS Lab • Prof. Per Enge, Dr. Todd Walter, Dr. Juan Blanch, Dr. Eric Phelts, Dr. Sherman Lo, Dr. Dave De Lorenzo, Doug Archdeacon, Alan Chen, Liang Heng, etc. • Collaborators outside of the GPS Lab • Universities and research institutes • Prof. Dennis Akos, Univ. of Colorado, Boulder • Mike Cousins and John Ciboci, SRI International • Industry • Stuart Riley, Trimble Inc. • FAA sponsors • JC Johns, Leo Eldredge, Deborah Lawrence, Carlos Rodriguez, Deane Bunce, Ted Urda and Jason Burns