Astronautics professor Grace Gao is an authority on the Global Positioning System. GPS has long been key to navigation on Earth, she says, but science is now shifting its focus outward to the frontiers of space. Gao is working on a GPS-like system for the Moon. To keep costs low, this lunar positioning system will leverage Earth-based satellites complemented by a network of smaller satellites in lunar orbit. It could lead to autonomous vehicles on the moon and a new era of lunar exploration, Gao tells host Russ Altman on this episode of Stanford Engineering’s The Future of Everything podcast. Have a question for Russ? Send it our way in writing or via voice memo, and it might be featured on an upcoming episode. Please introduce yourself, let us know where you're listening from, and share your quest. You can send questions to [email protected] Reference Links:Stanford Profile: Grace GaoGrace’s Labe:Stanford NAV LabConnect With Us:Episode Transcripts >>> The Future of Everything WebsiteConnect with Russ >>> Threads / Bluesky / MastodonConnect with School of Engineering >>> Twitter/X / Instagram / LinkedIn / FacebookChapters:(00:00:00) IntroductionRuss Altman introduces Grace Gao, a professor of aeronautics and astronautics at Stanford University.(00:02:15) GNSS vs. GPSThe difference between GPS and GNSS, and the different global navigation systems.(00:03:09) How Does GPS Work? GPS operation, including the role of satellites, ground monitoring stations, and user receivers.(00:04:07) GPS Signal and SatellitesHow GPS uses multiple satellites and how the different global systems collaborate to improve accuracy.(00:05:23) GPS Challenges in CitiesIssues with GPS in urban environments and the importance of reliability and safety.(00:07:53) Improving GPS AccuracyMultimodal sensor fusion helps enhance GPS accuracy in challenging environments. (00:10:11) Collaboration Among Autonomous VehiclesThe potential for autonomous vehicles to share information for better navigation and safety.(00:14:07) GPS Safety and Signal JammingGPS safety concerns and real-world signal disruption examples.(00:18:56) GPS in Space TravelHow GNSS and Earth-based GPS systems can support space missions.(00:25:05) Designing Lunar GPSThe cost and coverage challenges of creating a lunar navigation system.(00:27:13) Autonomous Moon RoversNASA’s plans for collaborative autonomous rovers on the Moon.(00:30:42) Conclusion
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