How to get one-meter location-accuracy from Android devices
summary
Recent Android P APIs expose Wi‑Fi RTT (IEEE 802.11mc) ranging—bursts of ~8 FTMs in hundreds of milliseconds—to deliver typical indoor accuracy of one to two meters (10× improvement over RSSI) and a live demo shows rerouting when position drifts ~20 feet. Phones expose raw GNSS via the GNSS Measurements API and a developer option disables duty‑cycling so dual‑frequency carrier phase plus reference‑station data (IGS/RTKLIB or commercial nets) yields decimeter/sub‑meter outdoor fixes. Google Wi‑Fi ships 11mc support this year.
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chapters (23)
- 0:00Start
- 0:17Overview
- 1:31Indoor Location Accuracy
- 2:05Gps
- 2:51Technologies
- 4:44Wi-Fi Round-Trip Time
- 6:48How We Calculate Location Indoors
- 7:49Wi-Fi Rtt Round-Trip Time
- 8:56Takeaways
- 9:57Principles of How Wi-Fi Mtt Works
- 14:07Challenges
- 16:06Live Rtg Demo
- 22:39One Meter Gps
- 22:54Basics of Gps
- 23:51Gps Tape Measure
- 25:26Gps Reference Stations
- 31:48Duty Cycling
- 32:40Basic Architecture
- 34:09Positioning with Android Gnss
- 35:50Summary
- 37:11Outdoors
- 37:42Precision Sports Monitoring
- 38:19Pointers
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