Different Numerical Interpolation Method To Establish Velocity Model

With the rise of space survey technology, which make high-precision geocentric coordinate system establishment possible, the developed countries and regions have successively established geocentric coordinate system. Our country started CGCS 2000 on July 1st 2008,which was composed of CORS network and national high-precision geodetic control network. This paper analyzed and studied geocentric coordinate system and its reference frame, and got the precise result of Crustal Movement Observation Network of China(CMONC) that calculated by high-precision data processing software GAMIT/GLOBK, then proposed our country mainland simplified model of block division, and set up China mainland crustal movement velocity model finally. The main research works and results are as follows:1. This paper Introduced global geocentric coordinate system and the establishment method of the reference frame, and analyzed the maintain ways of reference frame. The idea was referred which create unified space-time geodetic datum through the long-term reference frame and short-term reference frame.2. This paper analyzed the establishment of China Geodetic Coordinate System (CGCS2000) and introduced the method of frame transform between ITRF and CGCS2000 based on our country crust movement velocity field model. It will be useful for the future survey results unified into CGCS2000.3. The data of recent 10 years continuous observation results from state CORS network and the data between 1999 and 2009 from CMONC have been finely processed, the coordinates and velocities of Chinese mainland are obtained, which is the most precise(coordination better than 5mm, velocity better than 2mm/a), wide area(covering Chinese mainland), and densest.4. This paper analyzed the block division of Chinese mainland and puts forward China mainland simplified model of block division according to CMONC GPS sites position.5. This paper use Inverse Distance Weighting (IDW), Kriging method, hardy function interpolation and IDW based on Delaunay to establish a largely covered and valuable speed field mode with which the crustal movement images are also obtained and some useful conclusions are obtained.