Radio links can be used to transfer time from one clock to another. In radio links however, the
signal delays are changing with distance, ionosphere, troposphere, temperature, earth conductivity
and so on. To cancel these influences to first order the t
ITU-R TF.1153-2-2003 history
2003ITU-R TF.1153-2-2003 The operational use of two-way satellite time and frequency transfer employing PN codes Question ITU-R 201/7