Tightly coupled gps and dead-reckoning vehicle navigation

摘要

A tightly coupled GPS and dead-reckoning system collects wheel speed transducer data over a vehicle's network to compute vehicle range and direction. The dead-reckoning bridges over gaps in navigation solutions that would otherwise occur when GPS signal transmission is lost in tunnels, parking garages, and other common situations. Continual calibration of the wheel radii and compensation for speed effects are calculated from GPS position fixes, and such improves the performance and accuracy of dead-reckoning during long outages of GPS signal reception. When the GPS signals are restored, the dead-reckoning solutions provide a high quality starting place for the GPS receiver to search around.