GNSS seismic surface displacement monitoring method considering multipath and homomorphic errors

Abstract

The invention provides a GNSS seismic surface displacement monitoring method considering multipath and homomorphic errors. The GNSS observation stations are processed station by station through PPP, displacement sequences in the east direction, the north direction and the vertical direction are obtained, the starting time and the ending time of seismic waves in each observation station are detected, and the observation time period is divided into a non-seismic time period and a seismic time period. The spatial response and the principal component of the non-seismic period observation station displacement sequence are calculated by using a principal component analysis method. A homomorphic error in the displacement sequence of the observation station in the seismic period is calculated by combining the spatial response of the observation station in the non-seismic period and the principal component of the observation station in the seismic period. A homomorphic error in the displacement sequence of the observation station in the non-seismic period is calculated by combining the spatial response and the principal component of the observation station in the non-seismic period. Homomorphic errors are deducted from the observation station displacement sequence, multipath errors are eliminated through fixed star daily filtering, and finally the east-direction, north-direction and vertical high-precision earth surface displacement sequence is obtained. The multi-path errors among the observation stations have no correlation, and meanwhile, the non-uniform distribution characteristic of homomorphic errors is considered.

Description

technical field [0001] The invention belongs to the field of GNSS data processing, and is a GNSS seismic surface displacement monitoring method in consideration of multipath and homomorphic errors. Background technique [0002] Surface displacements induced by large earthquakes may be sensitive probes of frictional conditions at fault interfaces and rheology of the near-crust and upper mantle. GNSS Precise Point Positioning (PPP), as a new means of surface displacement acquisition, can assist the seismic network in earthquake monitoring. At present, the research mainly focuses on the data processing of tens of seconds and several minutes of earthquake time, and uses high-frequency GNSS to quickly extract co-seismic displacement and seismic wave waveform to meet the requirements of earthquake early warning, rapid rupture inversion, and rapid source parameter determination, etc., which require high time response. application scenarios. Although under good observation conditi...

AI Technical Summary

Problems solved by technology

[0007] Principal component analysis (PCA) can extract homomorphic errors at the same time, and allows homomorphic errors to be inconsistent in space, but requires the input data to be de-averaged and de-trended. If the station displacement affected by seismic waves is taken into account , will affect the extraction accuracy of the homomorphic error

Images