In-vehicle route guidance systems using map-matched dead reckoning

A functional overview of software for a route guidance system developed for commercial automotive use is presented. The system encompasses a sensor subsystem that filters noise from raw sensor data; a user interface and control subsystem, which accepts user inputs for direction generating and responds with audible or displayed directions at the appropriate time; a vehicle positioning subsystem, which determines the vehicle´s position in the road network based on sensor readings and map matching techniques; and a navigation subsystem that plots the requested route under a variety of nominal and nonnominal scenarios. An in-depth discussion of the map matched dead reckoning is presented, exploring the process whereby sensors and map and software are used to track vehicle position accurately. A discussion of preliminary results using these systems is given. It is concluded that initial tests, both via simulation and on the road, have validated the techniques and technology of route guidance using map matched dead reckoning for vehicle positioning