Intercomparison Study of Time and Frequency Transfer between VLBI and Other Techniques (GPS, ETS8(TCE), TW(DPN) and DMTD)

TL;DR

This study compares VLBI with GPS, ETS8(TCE), TW(DPN), and DMTD techniques for time and frequency transfer, demonstrating VLBI's stability and accuracy relative to other methods.

Contribution

It provides an intercomparison of VLBI with other time transfer techniques, highlighting VLBI's stability and measurement accuracy since 2007.

Findings

VLBI is more stable than GPS.

VLBI is slightly noisier than TW(DPN) and ETS8(TCE).

VLBI measures time differences as accurately as ETS8(TCE).

Abstract

We carried out the intercomparison experiments between VLBI and other techniques to show the capability of VLBI time and frequency transfer by using the current geodetic VLBI technique and facilities as the summary of the experiments that we carried out since 2007. The results from the two different types of experiments show that the VLBI is more stable than GPS but is slightly noisier than two new two-way techniques (TW(DPN), ETS8(TCE)), and VLBI can measure the correct time difference as same as ETS8(TCE).