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base stations. On top of that, the use a cesium atomic clock allows for
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additional filtering of daily delay oscillations. Once all these
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techniques are applied the overall impact of ionospheric delays is
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inferior to 1ns.
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inferior to 1ns. See [USE OF GEODETIC RECEIVERS FOR
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TAI](http://tycho.usno.navy.mil/ptti/ptti2001/paper35.pdf) by P.
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Defraigne, G. Petit and C. Bruyninx.
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If needed, the time transfer could still be improved by adding a posteri
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knowledge of the satellite orbits, atmospheric delays and GPS carrier
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