Geocentric Motion Calculation Method and Device Based on GNSS and SLR Peripheral Solution

Abstract

The embodiment of the invention provides a geocentric motion resolving method and a geocentric motion resolving device based on GNSS and SLR circumferential solutions, wherein the method comprises thefollowing steps of: combining the circumferential solution coordinates of a GNSS measuring station and SLR measuring station, taking the position coordinates of the GNSS measuring station and SLR measuring station under an international earth reference frame as a reference, calculating the geocentric motion by adopting a seven-parameter conversion solving unknown parameter method to obtain an initial resolving result of the geocentric motion; weighting the GNSS measuring station and the SLR measuring station by adopting a variance component estimation method based on an initial resolving result of the geocentric motion, and resolving the geocentric motion again according to the weighted result to obtain a geocentric motion time sequence; and extracting an annual term and trend term of thegeocentric motion time sequence based on a singular spectrum analysis method. According to the embodiment of the invention, the GNSS circumferential solution and the SLR circumferential solution arecomprehensively processed, so that the resolution precision is high, and a basis can be provided for the establishment of a millimeter-level international earth reference frame and the research of geophysics.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of geodesy, and more specifically, to a method and device for calculating geocentric motion based on GNSS and SLR circular solutions. Background technique [0002] The earth reference frame is the basis for expressing the earth's spatial information and describing the shape of the earth. According to the technical specifications published by the International Earth Rotation and Reference System Service, the origin of the international earth reference frame is the entire earth including the mass of the solid earth, oceans and atmosphere. Center of mass (CM). However, the origin of the international earth reference frame is only shown as the center of mass of the whole earth on the long-term scale, and on the short time scale, the origin of the international earth reference frame is closer to the shape center of the solid earth surface. The mass redistribution of the earth system cau...

AI Technical Summary

Problems solved by technology

However, GPS itself has problems such as phase center deviation, low sensitivity to the center of the earth, observations are not directly relative to the absolute distance of the satellite, and its own noise characteristics, which lead to large errors and instability in the monitoring of earth center movement based on GPS data.

In the space technology to realize the international earth reference frame, SLR (Satellite LaserRanging, satellite laser ranging) technology is based on satellite observation and realizes the earth reference system according to the dynamic orbit of the satellite. Since the satellite orbit is very sensitive to the change of the earth's gravitational field, it has a high accuracy, but there are problems such as the small number of SLR stations and the short time series of coordinates

[0004] Therefore, in order to solve the problem of large error and instability in the calculation of geocentric motion in the prior art, it is urgent to provide a method that can accurately solve the geocentric motion

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