Time-series InSAR analysis method for integrating tropospheric atmospheric delay correction

Abstract

The invention proposes a time-series InSAR analysis method for integrating tropospheric atmospheric delay correction, thereby correcting the tropospheric atmospheric delay phase error in surface deformation monitoring of the steep mountainous terrain. In the time series InSAR data processing flow, the tropospheric atmospheric delay correction process is added and specifically, vertical stratification atmospheric delay and turbulent mixing delay are carried out. The vertical stratification atmospheric delay is estimated jointly by using a numerical meteorological model and an iterative linear phase-elevation regression model. According to the iterative linear phase-elevation regression model, a coherent point with deformation is rejected by using iterative execution of a linear phase-elevation regression model, so that only the coherent point without the deformation is kept to calculate the linear model. Therefore, the vertical stratification atmospheric delay correction in the time series InSAR analysis method is realized and thus the iterative linear phase-elevation regression model is not affected by the coherent point target without deformation, so that the interference on the mountain surface deformation signal extraction by the atmospheric delay is reduced effectively.

Description

technical field [0001] The invention relates to the technical field of radar interferometry, and proposes and implements a time-series InSAR tropospheric atmospheric delay correction method for monitoring landslide deformation under terrain undulation conditions. Background technique [0002] In the past thirty years, with the rapid development of radar satellite system hardware, the rapid accumulation of observation data and the increasing progress of software technology, radar remote sensing technology has been widely used in the field of earth observation. Among them, radar interferometry (InSAR) technology It has great advantages in large-scale high-precision topographic mapping; differential interferometry (DInSAR) technology can accurately extract small surface deformation information, and can be used to monitor geological disasters such as earthquakes, volcanoes, and landslides. [0003] However, conventional DInSAR techniques are vulnerable to spatiotemporal decohere...

AI Technical Summary

Problems solved by technology

Therefore, the space-time combined filtering method in the traditional time series InSAR technology is only effective for the turbulent mixing delay component, and cannot eliminate the vertical layer delay component

Later, according to the spatiotemporal distribution characteristics of tropospheric delay and the types of external data used, some scholars proposed three types of methods to estimate and correct tropospheric delay: filtering method, empirical method and prediction method. The ideal solution emerges

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