Techniques for circumventing jamming of global positioning system receivers
AssigneeThe Johns Hopkins University
InventorScott M. Tyson
Life of this patent
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Abstract
A method and apparatus for circumventing jamming of receivers for a global positioning system (GPS) include determining that a receiver is being jammed by a jamming signal not originating from the GPS. A first signal is transmitted from a portable unit including the receiver to a component of a second positioning system that is different from the GPS. A second signal is received from the second positioning system. The second signal includes data that indicates a position for the portable unit determined in the second positioning system based at least in part on the first signal.
Claims19
A method for circumventing jamming of receivers for a global positioning system (GPS), the method comprising the steps of:
- determining that a receiver is being jammed by a jamming signal not originating from the GPS;
- responsive to determining the jamming signal, transmitting a first signal from a portable unit including the receiver to a component of a second positioning system that is different from the GPS;
- and
- receiving from the second positioning system a second signal that includes data that indicates a position for the portable unit determined in the second positioning system based at least in part on the first signal;
- wherein said step of transmitting the first signal further comprises including first data in the first signal for authenticating the portable unit as an authorized user of the second positioning system;
- and
- wherein said step of transmitting the first signal further comprises transmitting the first signal in a narrow beam that impinges on the component of the second positioning system and that does not impinge on a source of the jamming signals.
A method for circumventing jamming of receivers for a global positioning system (GPS), the method comprising the steps of:
- receiving, at a component of a second positioning system that is different from the GPS, a first signal from a portable unit including a receiver for the GPS, which portable unit has determined the receiver is being jammed by a jamming signal not originating from the GPS and transmitted the first signal responsive to determining the jamming signal;
- determining a position for the portable unit based at least in part on the first signal;
- and
- transmitting to the portable unit a second signal that includes data that indicates the position for the portable unit;
- wherein said step of receiving the first signal further comprises authenticating the portable unit as an authorized user of the second positioning system based at least in part on first data included in the first signal;
- and
- wherein said step of receiving the first signal further comprises receiving the first signal in a narrow beam that impinges on a component of the second positioning system and that does not impinge on a source of the jamming signals.
A computer-readable medium carrying one or more sequences of instructions for circumventing jamming of receivers for a global positioning system (GPS), wherein execution of the one or more sequences of instructions by one or more processors causes the one or more processors to perform the steps of:
- receiving, at a component of a second positioning system that is different from the GPS, a first signal from a portable unit that includes a receiver for the GPS, which portable unit has determined the receiver is being jammed by a jamming signal not originating from the GPS and transmitted the first signal responsive to determining the jamming signal;
- determining a position for the portable unit based at least in part on the first signal;
- and
- causing a transmitter to transmit to the portable unit a second signal that includes data that indicates the position for the portable unit;
- wherein said step of receiving the first signal further comprises authenticating the portable unit as an authorized user of the second positioning system based at least in part on first data included in the first signal;
- and
- wherein said step of receiving the first signal further comprises receiving the first signal in a narrow beam that impinges on a component of the second positioning system and that does not impinge on a source of the jamming signals.
Dependencies are inferred from the claim text.