Method for accurately quantifying influence of thermal expansion effect on GPS coordinate time series

Abstract

The invention discloses a method for accurately quantifying influence of a thermal expansion effect on a GPS coordinate time series. The method includes collecting a surface temperature time series of an IGS reference station, and collecting observation station information; calculating the total influence of the thermal expansion effect on an IGS reference station coordinate time series, i.e., Sequence A; adopting a surface mass load redistribution model to calculate a vertical direction displacement time series of the IGS reference station caused by environmental loads, i.e., Sequence B; adopting a GPS precise data processing model to obtain a coordinate time sequence of the IGS reference station, i.e., Sequence C; deducting Sequence B from Sequence C to obtain Sequence C-B; deducting Sequence A from Sequence C-B to obtain Sequence C-B-A; and based on the Sequence C-B and Sequence C-B-A, proposing that numerical value indexes are utilized to qualify the influence of the thermal expansion effect on the GPS coordinate time series. The method for accurately quantifying the influence of the thermal expansion effect on the GPS coordinate time series can obtain actual motion in the vertical direction of the IGS reference station caused by temperature variation, and adopts the numerical value indexes to accurately quantify the influence of the thermal expansion effect.

Description

technical field

[0001] The invention belongs to the technical field of nonlinear time series analysis, and in particular relates to an accurate quantification method for the influence of thermal expansion effect on GPS coordinate time series. Background technique

[0002] The change of GNSS coordinate time series is affected by many factors. In addition to the modeled factors such as solid tide and ocean tide, it will also be affected by environmental loads (non-tidal ocean loads, atmospheric pressure loads, hydrological loads, etc.) and thermal expansion effects. Influenced by geophysical effects. However, the velocity field model provided by the currently published coordinate reference frame (such as ITRF2008) does not consider this part of nonlinear motion, and cannot accurately describe the actual change characteristics of the reference station. Therefore, refining the thermal expansion impact calculation model, quantitatively determining the influence of thermal expans...

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