Secure information transfer based on global position
AssigneeThe Boeing Company
InventorsDavid S DeLorenzo, Per K Enge, Sherman C. Lo
Life of this patent
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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.
Claims11
A method executed by a first unit having a first antenna located 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 known to said method (secret code), for communicating a data signal of said first unit to a second unit having a second antenna at a second location that is known to said method, which is associated with a second 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;
- processing signal A with said data signal expressed through time delay, frequency shift, or both, to form 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, and processing said signal B with said data signal expressed through time delay, frequency shift, or both, to form signal B′;
- creating a signal C that is a function of signal A′ multiplied by signal B′;
- and
- sending signal C to said second unit.
A method executed by a unit having an antenna located at a second location, which antenna is constructed to receive a signal from each of one or more sources, comprising the steps of:
- creating a signal D that is developed from signals received by said antenna, which includes a signal of a preselected one of said sources, and the signal from said preselected one of said sources includes a component that is not publicly known and not known to said method;
- receiving a signal E from another unit having an antenna at a first location for receiving signals from said one or more sources;
- integrating a signal related to a product of signals D and E and to a signal F for a preselected duration to obtain an integration result signal;
- and
- repeating the step of integrating, with different values of said signal F, to identify a particular signal F that yields a maximum value for said integration result signal.
Dependencies are inferred from the claim text.