News from the BIPM laboratories—2022

Abstract

In order to fulfil its mission to ensure and promote the global comparability of measurements, the BIPM operates laboratories in the fields of physical metrology, time, ionizing radiation and chemistry. These laboratories act as centres for scientific and technical collaboration between Member States providing capabilities for international measurement comparisons on a shared cost basis. They coordinate international comparisons of national measurement standards agreed to be of the highest priority, and they establish and maintain appropriate reference standards for use as the basis of key international comparisons at the highest level and provide selected calibrations from them. In the following sections, we provide highlights of the work the laboratories have undertaken during 2022.

Evaluation of receiver calibration based on clock-steering for time–frequency transfer

“…Therefore, the uncertainty associated with the clock-steering u b,12 is considered to be 0.01 ns [39]. The last is the uncertainty of REFDLY u b,13 , which is about 0.3 ns [40]. Given the above analysis, the uncertainty of the GNSS-RTSD time synchronization calibration and common-clock calibration is shown in table 6.…”