Patent ID: 8040280

Claim:
A method for computing a location of a radio beacon by using received signal strength (RSS) and multiple frequencies, comprising the steps of: a) receiving first and second signals respectively having first and second frequencies in a plurality of base stations from the radio beacon and acquiring signal strength (s 1 , . . . , sn) of the received signals; b) receiving, from the plurality of base stations, phase differences ΔΦ 1 , ΔΦ 2 and ΔΦ 3 calculated between the first and second signals having first and second frequencies received in the base stations of the plurality of base stations; c) acquiring calculation distances (R 1 , . . . , Rn) based on the phase differences, wherein each calculation distance may correspond to a plurality of solution distances; d) calculating distances (d 1 , . . . , dn) to the radio beacon based on the received signal strength; e) removing phase ambiguity from the calculation distances by determining, for each calculation distance, the solution distance among the plurality of solution distances which is closest to a corresponding calculated distance to the radio beacon; and f) determining the location of the radio beacon based on the determined calculation distances deprived of the phase ambiguity.