Patent ID: 8035557
Filing Date: 2011-10-11
Classification: G01S

Abstract:
1. A method for detecting spoofed location data transmitted from a wireless device, comprising the steps of: determining an approximate location, the approximate location including a predetermined uncertainty area; determining acquisition assistance data for a first set of satellites as a function of the approximate location, the assistance data including a code phase uncertainty window corresponding to said predetermined uncertainty area; transmitting the assistance data to the wireless device; determining at the wireless device a first set of code phases which relate to said approximate location which is different than an actual location of the wireless device; transmitting said first set of code phases from said wireless device to a location determining system; determining at said location determining system a second set of code phases which relate to said approximate location; comparing said first and second sets of code phases; and identifying said wireless device as a spoofer if said comparison is less than a predetermined threshold.