Trimble’s RTX (Real-Time eXtended) technology is a key enabler for positioning of vehicles equipped with General Motors’ Super Cruise hands-free highway driving system. Debuting on the 2018 Cadillac CT6, the technology provides real-time, multi-constellation GNSS positioning that can reportedly achieve better than 1.5 in (38 mm) accuracy.

Standard GPS signals can drift up to 25 ft (7.6 m), which could cause incorrect lane identification. Lane-level accuracy is a critical enabler in advanced driver-assistance systems increasingly being used on highways. When used with high-definition maps, cameras, radar, and inertial sensors, the system improves lane-level positioning performance for semiautonomous and autonomous vehicles.

The technology uses signals captured by more than 100 Trimble GNSS reference stations around the world. It corrects the signals for atmospheric conditions, satellite orbit, and time synchronization errors and then sends those signals to GM vehicles with Super Cruise via OnStar 4G LTE cellular. The Trimble network is supported by redundant servers that are monitored 24/7 by a team of network engineers and IT specialists.

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