Patent ID: 8949941
Filing Date: 2015-02-03
Classification: G01S,H04B,H04L

Abstract:
1. A method for authenticating a physical location of a target node, the method comprising: sending, by the target node, a geothentication request to at least one trusted node with a known physical location; receiving, by the at least one trusted node, the geothentication request; sending, by the at least one trusted node, an inquiry message to the target node; receiving, by the target node, the inquiry message; sending, by the target node, a response message to the at least one trusted node; receiving, by the at least one trusted node, the response message; calculating a ranging measurement from the target node to the at least one trusted node by using an amount of time elapsed from the sending of the inquiry message to the receiving of the response message; and authenticating the physical location of the target node by using the ranging measurement from the target node to the at least one trusted node, wherein the physical location of the at least one trusted node is obtained via satellite geolocation techniques, and wherein the satellite geolocation techniques use at least one secure authentication signal, which is derived from at least one secret key, in order to obtain the physical location of the at least one trusted node.