Uncertainty evaluation of 2013 TL METODE link calibration tour

We targeting analyzed the UTC link delay of GPS station PTBB of PTB to TWTF of TL and expressed it as 3 groups: the uncompensated GPS common clock difference measurements, cable delay measurement, and the total delay variations of fixed GPS stations and travelling calibrator used in this METODE calibration tour. The total delay variation of fixed GPS stations PTBB and TWTF was evaluated by monitoring their long-term CCD of the same type receiver more than 350 days. For the BIPM travelling calibrator BP1C and BP0U, we used a moving cesium clock method to evaluate their instability of total delay in different antenna position. Our study was helpful for clarifying the uncertainty composition of the current PTB-TL link and could reduce it.