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Multi-level/multi-threshold/multi-persistency GPS/GNSS atomic clock monitoring

  • US 9,846,240 B2
  • Filed: 06/24/2014
  • Issued: 12/19/2017
  • Est. Priority Date: 01/15/2014
  • Status: Active Grant
First Claim
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1. A method, comprising:

  • establishing a measured difference of at least one of a phase or a frequency between an atomic frequency standard (AFS) and a monitoring device;

    modeling an estimated difference model associated with the at least one of the phase or the frequency between the AFS and the monitoring device;

    computing a residual signal based on the measured difference and the estimated difference model;

    analyzing, by a first detector, the residual signal at multiple thresholds, each of the thresholds having a corresponding persistency defining a number of times a threshold is exceeded before one or more of a phase jump, a rate jump, or an acceleration error is indicated; and

    analyzing, by a second detector, a parameter of the estimated difference model at multiple thresholds, each of the thresholds having a corresponding persistency defining the number of times a drift threshold is exceeded before a drift is indicated.

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