Patent ID: 6687609
Filing Date: 2004-02-03
Classification: G01C,G08G

Abstract:
A position tracking system for a plurality of mobile tractors and trailers comprising:an unique electronic identifier for each of a plurality of trailers; for each tractor of a plurality of tractors: a navigation system for determining a current position of the tractor; an electronic identifier reader for acquiring the electronic identifier of a trailer, of the plurality of trailers, coupled to the tractor; and a position-reporting subsystem, coupled to the navigation system and to the electronic identifier reader, for reporting to a remote system the current position of the tractor and the electronic identifier of the trailer coupled to the tractor; at each facility of a plurality of fixed-location facilities: one or more electronic identifier readers for acquiring the electronic identifier of one or more trailers, of the plurality of trailers, located within the facility; a trailer-presence reporting subsystem, coupled to the one or more electronic identifier readers of the facility, for reporting to the remote system the presence of the one or more trailers located within the facility.