Absolute Calibration of an Ashtech Z12-T GPS Receiver |
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Authors: | Gérard Petit Zhiheng Jiang Joe White Ronald Beard Edward Powers |
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Institution: | (1) BIPM, Pavillon de Breteuil, 92312 Sèvres Cedex, France, FR;(2) U. S. Naval Research Laboratory, Washington, DC, USA, US;(3) U. S. Naval Observatory, Washington, DC, USA, US |
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Abstract: | Dual-frequency carrier phase and code measurements from geodetic type receivers are a promising tool for frequency and time
transfer. In order to use them for clock comparisons, all instrumental delays should be calibrated. We have carried out the
calibration of one such receiver, an Ashtech Z12-T type, by two different methods: first, by absolute calibration using a
GPS simulator; second, by differential calibration with respect to a time transfer receiver that had previously been calibrated.
We present the experimental set-ups and the results of the two experiments and estimate the uncertainty budget. An ultimate
uncertainty of order 1 ns in the absolute calibration seems to be attainable. ? 2001 John Wiley & Sons, Inc. |
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