1) the development of new observation techniques and new systems for advanced Earth's rotation observations by VLBI and other space techniques,
2) the promotion of research in Earth rotation by advanced methods in VLBI,
3) the distribution of new VLBI technology.
The TDC meeting, attended by the ordinary members from inside the CRL and the
special members from the outside, is held twice a year. The special members
advise the committee, concerning the plan of technical developments. The TDC
newsletter is published biannually by CRL to inform the IERS community its
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