Method for acquiring noise models of coordinate time series of regional GPS (global positioning system) reference stations

Abstract

The invention provides a method for acquiring noise models of coordinate time series of regional GPS (global positioning system) reference stations. The method includes steps of 1, collecting data; 2, selecting a plurality of groups of combined noise models according to a basic principle that the noise models cover integral frequency bands of noise frequencies; 3, respectively analyzing noise of the coordinate time series of the GPS reference stations and noise of environmental-load-corrected coordinate time series of the GPS reference stations by the aid of a maximum likelihood estimation process according to the various combined noise models, and acquiring MLE (maximum likelihood estimation) values of the various combined noise models at components of the coordinate time series of the GPS reference stations; 4, acquiring the optimal noise models at the components of the coordinate time series of the GPS reference stations according to the MLE values of the combined noise models. The method has the advantages that the optimal noise models of the regional GPS reference stations can be effectively built, nonlinear movement is taken into consideration of the optimal noise models, accordingly, actual movement of the observation stations can be effectively represented as compared with existing models, and noise signals which are reflected by the coordinate time series can be reasonably explained.

Description

technical field [0001] The invention belongs to the field of satellite navigation and positioning technology and application, in particular to a method for obtaining a noise model of a coordinate time series of a regional GPS reference station. Background technique [0002] As various research fields have higher and higher requirements for the accuracy of geodetic results, the nonlinear time-variation of geodetic positions has attracted more and more attention. It is of great theoretical significance and application value to study the nonlinear variation of GPS reference station coordinate time series. In addition to geophysical effects and GPS technical system errors, the influence of various random factors may also cause nonlinear changes in the coordinate time series of GPS reference stations, and this kind of influence is defined as noise. It is a hot issue in the field of GPS data processing to establish an appropriate random noise model for the coordinate time series o...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the fact that the current noise model cannot be applied to the coordinate time series of GPS reference stations in different regions, the present invention provides a noise model acquisition method for the

Images