Road toll system

摘要

A road toll system comprises a vehicle-mounted unit having a satellite navigation receiver. A first data processing means determines a route taken 5 based on satellite navigation data provided from the receiver, and the satellite navigation data is associated with a variable identity. A road toll level is derived. A second data processing means receives the road toll level provided by the first data processing means, and the satellite navigation obtains the determined road toll level from the second data processing means using the 10 variable identity. This provides a thin client scenario (the receiver does not implement the map calculations), but with data security corresponding to a thick client solution. Thus, the map matching and trip cost computation steps are delegated by the on-board unit to an external unit, but this delegation is performed anonymously, so that no data sent for external processing 15 compromises the privacy of the data.

主权项

1. A road toll system comprising:
a satellite navigation receiver implementing a position tracking function, the satellite navigation receiver providing satellite navigation data; a first data processor that determines a route taken based on satellite navigation data provided from the satellite navigation receiver, the satellite navigation data being associated with a variable identity, and that determines a road toll level, the first data processor then outputting the determined road toll level; and a second data processor that receives, from the first data processor, the determined road toll level output by the first data processor, the second data processor outputting the determined road toll level, wherein the satellite navigation receiver obtains the determined road toll level from the second data processor using the variable identity.