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US 11,194,053 B1Granted
Global navigation satellite system spoofer identification technique based on carrier to noise ratio signatures
AssigneeInterstate Electronics Corporation
InventorsIvan L. Johnston, Gilberto Isaac Sada, Steven B. Alexander
Life of this patent
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Abstract
Disclosed is a technique that can provide one or more countermeasures against spoofers. A beamformer can control an antenna pattern of a CRPA to generate a survey beam. The survey beam is swept across space to determine a characteristic signature based on carrier-to-noise ratios (C/No) for particular space vehicle signals. Matching C/No signatures can be used to identify the existence of spoofers and invoke a countermeasure, such as nulling.
Claims33
An apparatus comprising:
- a beamformer device configured to beam steer one or more survey beams of a controlled reception pattern antenna (CRPA);
- and
- a processor comprising hardware, wherein the processor configured to:
- cause the beamformer device to generate the one or more survey beams of the CRPA to survey a plurality of directions in space;
- step the one or more survey beams through a plurality of angles to survey the plurality of directions in space and dwell at a given step for a period of time and obtain carrier-to-noise ratio (C/No) readings to generate respective C/No signatures for a plurality of space vehicle (SV) signals in view;
- receive space vehicle (SV) signals that appear to be associated with two or more space vehicles of a global navigation satellite system (GNSS);
- and
- identify space vehicle (SV) signals that appear to be associated with two or more space vehicles of the global navigation satellite system (GNSS) that have similar carrier-to-noise ratio (C/No) signatures;
- and
- use the identification of space vehicle (SV) signals that appear to be associated with two or more space vehicles of the global navigation satellite system (GNSS) that have similar carrier-to-noise ratio (C/No) signatures to identify an existence of a spoofer.
7 more elements
An apparatus comprising:
- a beamformer device configured to beam steer one or more survey beams of a controlled reception pattern antenna (CRPA);
- and
- a processor configured to:
- cause the beamformer device to generate the one or more survey beams of the CRPA to survey a plurality of directions in space;
- receive space vehicle (SV) signals that appear to be associated with two or more space vehicles of a global navigation satellite system (GNSS);
- and
- determine a position of the vehicle using GNSS signals, wherein the CRPA is attached, directly or indirectly, to the vehicle;
- obtain carrier-to-noise ratio (C/No) signatures generated using the received space vehicle (SV) signals;
- use the carrier-to-noise ratio (C/No) signatures to identify a spoofer;
- observe the spoofer at least twice via the C/No signatures;
- and
- determine a location of the spoofer based on observed positions of the vehicle and the observed C/No signatures.
9 more elements
An electronically-implemented method of detecting a spoofer, the method comprising:
- beam steering, using a beamsteering device, one or more survey beams of a controlled reception pattern antenna (CRPA) to survey a plurality of directions in space;
- stepping the one or more survey beams through a plurality of angles to survey the plurality of directions in space;
- dwelling at a given step for a period of time and obtaining C/No readings for a plurality of SV signals in view;
- using the C/No readings to generate C/No signatures;
- receiving, using a receiving device, space vehicle (SV) signals that appear to be associated with two or more space vehicles of a global navigation satellite system (GNSS);
- identifying space vehicle (SV) signals that appear to be associated with two or more space vehicles of the global navigation satellite system (GNSS) that have similar carrier-to-noise ratio (C/No) signatures;
- and
- using, by the processing device, the identification of space vehicle (SV) signals that appear to be associated with two or more space vehicles of the global navigation satellite system (GNSS) that have similar carrier-to-noise ratio (C/No) signatures to identify an existence of a spoofer.
5 more elements
Dependencies are inferred from the claim text.