System and method for tracking vehicles and containers
US7755541B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 11, 2008 |
| Grant date | Jul 13, 2010 |
| Priority date | — |
| Expiry date | Jan 4, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S19/09
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A location system for tracking assets within a terminal includes a Differential Global Positioning System (DGPS) reference receiver within the terminal that receives GPS signals and generates DGPS correction data. In one aspect, a roving receiver unit is carried by an asset to be tracked within the terminal. It includes a GPS receiver that receives GPS signals and the DGPS correction data from the DGPS reference receiver. A tag transmitter transmits a wireless RF signal containing GPS location data based on received GPS signals and DGPS correction data. At least one access point is positioned within the terminal for receiving the wireless RF signal from the tag transmitter. A processor is operatively connected to the at least one access point for receiving GPS location data and determining a location of the asset to be tracked.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.