Road map feedback server for tightly coupled gps and dead reckoning vehicle navigation

摘要

Road map feedback is used in a tightly coupled GPS and dead-reckoning system that collects wheel speed transducer data over a vehicle's CANbus network to compute vehicle range and direction. Road segment information provided by a network server provides a database of constraints that are templated on to current navigation solutions so that corrective feedback can be derived. 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. The road map fitting controls drift that would otherwise accumulate during long periods of dead reckoning only operation.