Patent ID: 8195200

Claim:
A method for determining navigation data for a location subject having at least one location data receiver using location measurement data provided by one or more location measurement data sources of a location technology source, the method comprising: (a) establishing a location for the location subject (b) calculating one or more theoretical ranges from the location subject to the one or more location measurement data sources based on the location of the location subject (c) obtaining location measurement data via a location receiver of the location subject from the one or more location measurement data sources; (d) calculating one or more augmented ranges from the one or more theoretical ranges and a percentage of a difference between the theoretical ranges and one or more range related parameters contained in the location measurement data; (e) establishing an updated location of the location subject based on the augmented ranges; and (f) repeating steps (b) through (e) while decreasing the percentage of the difference between the one or more theoretical ranges and the one or more range related parameters until a defined minimum percentage is reached, wherein a range residual is calculated for each location measurement source providing location measurement data to the location subject and the method further comprises: determining a mean range residual and a population standard deviation for range related parameters obtained from all location measurement data sources; low pass filtering the population standard deviation; identifying a location measurement data source having a largest difference between its range residual and the mean range residual; and comparing the largest difference with a defined maximum threshold and eliminating location measurement data from the identified location measurement data source from calculations.