Aidan Montare, Jeff Sherman, Michael Lombardi, National Institute of Standards and Technology

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A low-cost, dual-frequency, multi-constellation global navigation satellite systems (GNSS) receiver recently became available, the Ublox ZED-F9T [1, 2]. The receiver functionality includes the output of raw pseudorange and carrier-phase observables, estimate of per-satellite pseudorange residuals, output of a pulse-per-second (aligned to one of several broadcast time scales) with data to correct for a small sawtooth-like output timing quantization error, and receiver time-tagging of input pulse signals. We present methods and test data supporting common-view time transfer using these receiver features. Of note, we examine a mode of time-transfer requiring no additional time-interval counter hardware. In a small-baseline common-clock experiment, the time deviation (TDEV) statistic evaluated at an averaging interval of one day was less than 1 ns. [1] Commercial equipment is identified for informational purposes only. Such identification does not imply recommendation or endorsement by the National Institute of Standards and Technology, nor does it imply that the equipment is necessarily the best available for purpose. [2] Similar work includes M. J. Wouters, E. L. Marais, “Using Low-Cost Receivers for Multi-GNSS Time Transfer.” Proceedings of the 2019 Joint Conference of the IEEE International Frequency Control Symposium and European Frequency and Time Forum (EFTF/IFC).