Patent ID: 7299057
Filing Date: 2007-11-20
Classification: G01C,H04L

Abstract:
1. A method for determining a location of a vehicle, the method comprising: determining reception location data within a first cell of a work area for a vehicle, a location determining receiver providing the reception location data from reception of electromagnetic energy transmitted from terrestrial or satellite beacons; estimating reception quality data for the corresponding reception location data for the first cell; determining optical location data within a first cell of a work area for a vehicle; estimating reception quality data for the corresponding reception location data for the first cell; selecting at least one of the reception location data and the optical location data as refined location data associated with the first cell based on the estimated reception quality data and the estimated optical quality data, where the optical location data is selected as the refined location data if the estimated reception quality data and estimated optical quality data are not available for the work area and if the reception location data falls below a threshold level of reliability.