Interference-aided navigation with cyclic jammer cancellation
AssigneeRockwell Collins, Inc.
InventorJames H. Doty
Life of this patent
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Abstract
An interference-aided signal acquisition and tracking system includes a vehicle, an interference detector, a noise canceller, and a signal processor. The vehicle has at least two receivers configured to detect external signals and the at least two receivers have an output dependent on attitude of the vehicle. The interference detector measures the output of at least one of the at least two receivers. The noise canceller combines the output of the at least two receivers. The signal processor extracts a desired signal from the output of the noise canceller. The output of the interference detector is used to control the noise canceller as to reject unwanted signals and enhance performance of the signal processor in extracting the desired signal.
Claims17
An interference-aided signal acquisition and tracking system comprising:
- a vehicle having at least two receivers configured to detect external signals, the at least two receivers having an output dependent on attitude of the vehicle;
- an interference detector that measures the output of at least one of the at least two receivers, wherein the interference detector comprises a rotation tracker that provides a rotation estimate;
- a noise canceller that combines the output of the at least two receivers, wherein the noise canceller comprises an interference cancellation controller that applies modulations to null an interference signal as a function of the rotation estimate;
- and
- a signal processor that extracts a desired signal from the output of the noise canceller, wherein the output of the interference detector is used to control the noise canceller as to reject unwanted signals and enhance performance of the signal processor in extruding the desired signal.
A method of signal acquisition and tracking comprising:
- receiving external signals at a spinning vehicle;
- measuring the received external signals;
- providing a rotation estimate of the rotation of the spinning vehicle;
- modulating the received external signals to null an interference signal;
- and
- extracting a desired signal from the combined external signals.
A signal acquisition and tracking system where interference is cancelled for jamming immunity with spinning vehicles operating in interference environments, the system comprising:
- a number of signal receivers associated with a spinning vehicle;
- a rotation tracker that obtains signals from the number of signal receivers and provides a rotation estimate;
- a global positioning system (GPS) processor that provides satellite geometry information;
- and
- an interference cancellation controller that obtains the rotation estimate and the satellite geometry information and modulates to null interference received by the number of signal receivers.
Dependencies are inferred from the claim text.