Secure Information Transfer Based on Global Position

Abstract

Secure communication of information is effected from a first party to a second party when the first party knows its own global location and the global location of the second party, and employs what essentially is an undiscoverable code signal that is broadcast to, and received by, both the first and the second parties. The first party securely communicates information to the second party by modifying the code signal with the information that is to be communicated and sends the modified code signal to the second party. Illustratively, the code signal is related to the Y component of a GPS signal.

1 . A method executed by a first unit that is coupled to a first antenna that is situated at a first location, which antenna is constructed to receive a signal comprising a sum of constituent signal, each from a different source of a plurality of sources, and each of the constituent signals containing a component that is modulated by a known code and a component that is modulated by a code that is not publicly known and not available to said first unit (secret code), for communicating a data signal from said first unit to a second unit that is coupled to a second antenna that is situated at a second location that is known to said firs unit, comprising the steps of:
 processing said signal to remove a Doppler frequency shift that said signal experiences in arriving at said first antenna, thereby creating a signal A;   creating a signal B that corresponds to a signal that is expected to have been received at said second antenna in response to a signal transmitted by a particular one of said sources;   combining signal A, signal B, and said data signal to form a signal C, where said data signal is expressed as time delay, frequency shift, or both; and   sending signal C to said second unit.