Abstract
Abstract. The definition, renewal and maintenance of geodetic datum has been international hot issue. In recent years, many countries have been studying and implementing modernization and renewal of local geodetic reference coordinate frame. Based on the precise result of continuous observation for recent 15 years from state CORS (continuously operating reference system) network and the mainland GNSS (Global Navigation Satellite System) network between 1999 and 2007, this paper studies the construction of mathematical model of the Global CGCS2000 frame, mainly analyzes the theory and algorithm of two-step method for Global CGCS2000 Coordinate Frame formulation. Finally, the noise characteristic of the coordinate time series are estimated quantitatively with the criterion of maximum likelihood estimation.
Highlights
CGCS2000 (China Geodetic Coordinate System 2000) has been adopted nearly 10 years since July 1, 2008 (Yang, 2009), which was composed of CORS network and national high-precision geodetic control network
Inner constraints algorithm redefine constraint conditions of coordinate reference frame according to minimum standard of transform parameters and its rate, adjusted network which is obtained though Coordinate similarity transformation can ensure the highest fitting degree to the initial network shape, and can keep the inherent purity of coordinate network from different observation technology (Wei, 2010)
We can obtain the conclusion based on above analysis: 1. Finely processed coordinates and velocities of Chinese mainland have been obtained derived from recent 15 years continuous observation results of state CORS network and the GNSS stations, which is the most precise, Wide area, and densest (1081 points)
Summary
CGCS2000 (China Geodetic Coordinate System 2000) has been adopted nearly 10 years since July 1, 2008 (Yang, 2009), which was composed of CORS network and national high-precision geodetic control network. With relevant state construction project successfully implemented, the number of China's national CORS stations has reached 410, and evenly covered China's territorial lands , becoming the mainstay of maintaining the CGCS2000 coordinate framework (Liu, 2009). Based on the processing results of the 16-year national CORS station, this paper studies the theory and algorithm of constructing the global CGCS2000 coordinate reference frame using the two-step model, and the noise characteristic of the coordinate time series are estimated quantitatively with the criterion of maximum likelihood estimation
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