Honeywell International Inc.

Anthony Pritchard

James Arthur McDonald

Karl Abraham Keyzer

James Arthur Mcdonald

A system for detecting satellite signal spoofing using error state estimates is provided. The system includes at least one satellite receiver to receive satellite signals, at least one memory and at least one controller. The at least one memory is configured to store at least operation instructions. The at least one controller is in communication with the at least one satellite receiver and the at least one memory. The at least one controller is configured to determine state estimates from the received satellite signals. The at least one controller is further configured to determine error state estimates based at least in part on differences in current state estimates and differences in delayed state estimates. The controller further configured to determine if spoofing is occurring in one more of the received satellite signals when the error state estimates are greater than a select threshold.

Detecting satellite signal spoofing using error state estimates

Systems and methods for GNSS spoofing detection using C/No based monitoring are provided. In certain embodiments, a system including at least one GNSS receiver that provides C/No for GNSS signals received from GNSS satellites. The system also includes a processor coupled to the at least one GNSS receiver. The processor executes instructions that cause the processor to calculate new C/No comparison values based on the C/No measurements and previous C/No comparison values. Further, the instructions cause the processor to compare the C/No measurements against the previous C/No comparison values. Moreover, the instructions cause the processor to determine whether one or more of the GNSS signals are spoofed based on the comparison of the C/No measurements against the previous C/No comparison values. Additionally, the instructions cause the processor to set the new C/No comparison values as the previous C/No comparison values.

GNSS spoofing detection using carrier-to-noise based monitoring

A spoofing detection system including at least one antenna, a receiver and a controller is provided. The at least one receiver is in communication with the at least one antenna to receive detected satellite signals. The controller is configured to determine raw pseudorange values from the received satellite signals. The controller is further configured to apply at least one first filter on the raw pseudorange values to generate at least an output of first filtered pseudorange values. The controller is also conjured to compare an output of the first filtered pseudorange values with one of the raw pseudorange values and second filtered pseudorange values from a second filter. The controller is further configured to determine if spoofing is present in the received satellite signals based on a determined divergence between the output of first filtered pseudorange values and one of the raw pseudorange values and the second filtered pseudorange values.

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Coon Rapids, MN, United States of America

Anthony Pritchard