A discussion on the time criterion of the 50m radio-telescope

Details A discussion on the time criterion of the 50m radio-telescope A discussion on the time criterion of the 50m radio-telescope

Jul 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006acasn..47..348n&link_type=abstract

Acta Astronomica Sinica, vol. 47, no. 3, p. 348-354

Astronomy and Astrophysics

Astronomy

Astrometry, Radio Astronomy, Time Criterion, Atomic Clock

Scientific paper

It analyzes the influence of the time-frequency properties of atom clock on time-keeping error by quantity, and estimates the error of related physical measure caused by the time-keeping properties of atom time-frequency criterion---time resolution. The comparison table of modern practical atom clock's performance index is given. The index of transferring and comparing standard time-frequency signal by modern radio means is also listed. The high-precision time-frequency criterion's important status in the fields of exploration of earth and astrospace, VLBI and the timing application of millisecond pulsars are also discussed. The high-precision requirement and selection principle, which are applied to time criterion by ``Chang E-I'' moon-exploration task, and the 50m radio telescope's scientific aim are set forth. In order to achieve its scientific aim and task, the time-frequency criterion, which is correspondent to its research goal and high-standard as soon as possible, must be set up, so that the high-quality data and high-efficiency research achievement can be attained. The problem of what time criterion should be set up is discussed, and the primary suggestions are put forward as well.

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