Car localization: why GNSS isn't the whole system

Useful to know

For assisted and automated driving, Bosch describes localization through a combination of technologies. Satellite GNSS signals are supplemented with correction service, data from inertial measurements and environment information. The goal is a more reliable assessment of the situation than from a single source alone. [1]

When the satellite connection is impaired, measurements of one's own motion can help track the relative change. This is not the same as a promise of an infinitely accurate position without outside information.

Distinguish the point displayed in plain navigation from the requirements of a system that supports management. The presence of a map on the screen does not automatically prove a certain level of automation. The described technology is an example of a specific architecture; equipment, services and operating restrictions should be checked for the respective vehicle.