Spanish System Sharpens GPS Accuracy to One Meter

Researchers in Spain say they can improve the accuracy of an automotive GPS system 90% by integrating its signal with those from multiple onboard accelerometers and gyroscopes.

The system developed at the Universidad Carlos III de Madrid analyzes signals from a standard GPS with those from a low-cost inertial measurement unit consisting of three accelerometers and three gyroscopes.

GPS alone has an accuracy of about 15 meters in an open area. But in cities, where reflections and obstacles degrade the satellite signals used for positioning, accuracy can deteriorate to 50 meters or more, according to the researchers. They say their system can achieve accuracy of only 1 meter even in urban settings.

The combination of inputs monitored by the Spanish system instantly filters out deviations caused by GPS signal degradation or loss. The developers say they plans to investigate the feasibility of using sensors in a driver's smart phone to achieve similar results.