Patent ID: 7298328
Filing Date: 2007-11-20
Classification: G01S

Abstract:
1. A method of localizing a geographic position of a radio receiver, the method comprising: obtaining a current radio signature by scanning a contiguous range of frequencies in a frequency spectrum, wherein said current radio signature comprises a plurality of measured signal qualities that collectively represent said frequency spectrum, each measured signal quality in said plurality of measured signal qualities is for a corresponding frequency window in a plurality of frequency windows, wherein each respective frequency window in the plurality of frequency windows is for a predetermined range of frequencies in said contiguous range of frequencies, and wherein the signal quality of a respective frequency window in the plurality of frequency windows of the current radio signature is deemed to be the strongest signal measured in the predetermined range of frequencies in said respective frequency window; and comparing said current radio signature to a plurality of reference radio signatures, each reference radio signature in said plurality of reference radio signatures associated with a global position; wherein when said comparing identifies a unique match between said current radio signature and a reference radio signature in said plurality of reference radio signatures, said radio receiver is deemed to be localized to the global position associated with said reference radio signature.