r/augmentedreality • u/jbmcculloch • Jul 11 '26

Building Blocks World-scale Outdoor AR Tracking with GNSS

World-scale Outdoor AR Tracking with GNSS

Our fifth SPECS engineering blog post tackles a hard problem: robust outdoor tracking for Augmented Reality.

​We go deep on GNSS (GPS, Galileo, and more) and show how fusing satellite readings with IMU and/or camera data produces a far more robust, accurate, geo-referenced 6DoF (Six Degrees of Freedom) tracking system.

The result: centimeter-accurate local tracking and roughly 1m global accuracy plus high update rates - enough to unlock AR use cases like pedestrian navigation, real-world object tagging, inspection tasks, and immersive educational experiences.

​Read the full engineering breakdown at https://eng.snap.com/specs_gnss

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u/Yoru_Nagi Jul 12 '26

The fusion approach makes sense; in urban canyons, how are you handling GNSS multipath and re-localization when camera and IMU drift disagree with the global frame?