Patent ID: 8599068

Claim:
A system for verifying a reported location of a mobile terminal comprising: a receiver of the mobile terminal adapted to: receive a plurality of radio ranging signals broadcast from a plurality of signal sources at known locations, wherein each of the radio ranging signals is modulated by a first publicly disclosed code and a first undisclosed code, wherein the first undisclosed code includes a composite of a second publicly disclosed code and a second undisclosed code, and wherein the second undisclosed code has a lower bandwidth than the first undisclosed code; process the plurality of radio ranging signals to generate measured quantities related to the second undisclosed code; and provide the reported location of the mobile terminal; and a verification processor adapted to: receive the measured quantities related to the second undisclosed code and the reported location of the mobile terminal; generate expected quantities related to the second undisclosed code based on the reported location of the mobile terminal; and compare the measured quantities related to the second undisclosed code to the expected quantities related to the second undisclosed code to verify the reported location of the mobile terminal.