Method and device for constructing motion model of framework site of geocentric coordinate system

Abstract

The invention provides a method and device for constructing a motion model of a framework site of a geocentric coordinate system, and relates to the technical field of coordinate frameworks of the geocentric coordinate system and geodetic datum maintenance. The method comprises the steps that an original three-dimensional coordinate time sequence of the framework site of the geocentric coordinate system is acquired; the original three-dimensional coordinate time sequence is analyzed, a first missing point and a second missing point are determined, the first missing point and the second missing point are subjected to three-dimensional coordinate data interpolation processing, and the three-dimensional coordinate time sequence after interpolation processing is obtained, wherein the first missing point is a time point corresponding to three-dimensional coordinate data which has gross errors, and the second missing point is a time point which lacks the three-dimensional coordinate data in a preset time sequence; based on the three-dimensional coordinate time sequence after interpolation processing, the motion model of the framework site of the geocentric coordinate system is constructed through the multichannel singular spectrum analysis theory. According to the method and device, the technical problem of low precision in the prior art of constructing the geocentric coordinate frameworks is solved.

Description

technical field [0001] The invention relates to the technical field of geocentric coordinate frame and geodetic datum maintenance, in particular to a method and device for constructing a geocentric coordinate frame site motion model. Background technique [0002] my country launched the China Geocentric Coordinate System CGCS2000 and the corresponding coordinate reference frame on July 1, 2008. In view of the impact of the earth's rotation on the surface mass load, establishing an accurate geocentric coordinate system frame site motion model is the key to maintaining the geocentric An important basis for the accuracy and stability of the coordinate system frame. The establishment of the motion model of the frame site in the geocentric coordinate system needs to analyze the coordinate time series of the frame site and study the noise characteristics and other characteristics of the frame site. [0003] At present, in the process of establishing the geocentric coordinate syste...

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Problems solved by technology

[0003] At present, in the process of establishing the geocentric coordinate system frame station motion model, there are mainly the following deficiencies: (1) When performing missing value interpolation on the original coordinate time series, it is often impossible to reliably perform long-term missing coordinate data. Interpolation; (2) When performing signal-to-noise separation, certain a priori assumptions must be made on the motion and noise characteristics of the site, and the resulting signal-to-noise separation results depend to a certain extent on the accuracy of the a priori assumptions; ( 3) The motion model of the frame site is only estimated using a linear model, and the nonlinear motion caused by various factors must be ignored

The above three deficiencies reduce the accuracy of the constructed geocentric coordinate system frame station motion model as a whole, and it is difficult to meet the needs of many scientific research and engineering monitoring projects with high precision and real-time requirements, and it is also not suitable for today's precise positioning and navigation. needs

[0004] Building a geocentric coordinate system frame station motion model based on the single-channel singular spectrum analysis theory can solve the above shortcomings. However, the single-channel singular spectrum analysis theory based on the single-channel singular spectrum analysis theory of the single-direction coordinate time series of a single station ignores the correlation between the three-dimensional coordinate time series. , thus affecting the accuracy of the geocentric frame frame station motion model

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