Signal inconsistency detection of spoofing
First Claim
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1. A method of detecting whether a navigation signal is a spoofing signal using one or more radio receiver, at least one antenna, and an inertial reference system, the method comprising:
- computing velocity changes of the at least one antenna using the inertial reference system;
deriving velocity changes of the at least one antenna using the navigation signal;
calculating a difference between the computed velocity changes and the derived velocity changes; and
comparing the difference to a predetermined threshold to determine whether the received signal is a spoofing signal.
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Abstract
Methods and apparatus relating to signal inconsistency detection of spoofing (SIDS), i.e. the use of inconsistencies in signals received at a plurality of points in space to detect spoofing.
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Citations
18 Claims
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1. A method of detecting whether a navigation signal is a spoofing signal using one or more radio receiver, at least one antenna, and an inertial reference system, the method comprising:
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computing velocity changes of the at least one antenna using the inertial reference system; deriving velocity changes of the at least one antenna using the navigation signal; calculating a difference between the computed velocity changes and the derived velocity changes; and comparing the difference to a predetermined threshold to determine whether the received signal is a spoofing signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of validating a navigation signal using a radio receiver having an antenna and an inertial reference system capable of tracking position changes of the antenna, the method comprising:
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obtaining a first navigation measurement from a navigation signal with the antenna in a first position; obtaining a second navigation measurement from the navigation signal with the antenna in a second position; calculating a difference between the first and second measurements; estimating a relative difference between the first navigation measurement and the second navigation measurement using the inertial reference system; comparing the estimated difference to the calculated difference; and determining validity of the navigation signal based on the comparison. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification