Research On The Terrestrial Reference System And Its Relative Factors

Astrogeodynamics(as well as space geodynamics) is a new crossing subject of astronomy, geodesy, meteorology, oceanography, seismology, geology and geophysics, which studies earth movement and its dynamic mechanism by astronomical method(space geodetic surveying).Terrestrial reference system(TRS) is one of its basic studying contents. It is very importantly significant not only for the whole and local movement of the earth but also for the national economy and defense development. In this paper the author specially studies the establishment of conventional terrestrial reference system and plate motion model using spatial geodetic techniques. The following are the major contents and the innovations of the paper.This paper systematically summarizes the features of independent terrestrial reference frame by space technique. It analyses the real accuracy of coordinates of independent TRF using robust iteration and equivalent weight method and the real accuracy of velocity field using least square and residual analysis. It compares the real accuracy with the marker precision by international data analysis centers.This paper deduces the mathematical model of CTRS established by the combining observation data of space techniques. Using data of each analysis center by GPS, VLBI and SLR it calculates the transformation parameters from each technique to the new CTRF, the coordinate field and the position errors of the new CTRF. The result is compared with the ITRF2000' s.Adopting the combination data of GPS and VLBI this paper founds a current plate motion model based up completely on space techniques. The geological model NUVEL1A is compared with the current model. It is confirmed that the SHA site is not fixed on the Eurasian plate and our national southeast plate has a relative motion with Eurasian plate.