Atmospheric Phase Screen Extraction Method Based on Ground-based Synthetic Aperture Radar Interferometry

Abstract

The invention discloses an atmospheric phase screen extraction method based on ground-based SAR (synthetic aperture radar) interference. Atmospheric phase is extracted according to a ground-based radar differential interferometric phase model on basis of a least squares fitting linear deformation and time-space filtering method. The ground-based radar differential interferometric phase model has a full consideration of the ground-based radar imaging mechanism and the differential interference theory so as to extract an atmospheric phase screen. A PS (permanent scatterer) point selection method of three levels, amplitude dispersion index, correlation index and phase stability, is provided, the atmospheric phase screen of radar data of each scene is finally obtained by means of Kriging interpolation, and accurate extraction of the phase generated under atmospheric interference has an important role on improving radar interferometric precision. Correctness of the method is verified by measured dam data, and the method is of certain actual application value and universality.

Description

technical field [0001] The invention relates to the technical field of surveying, in particular to an extraction method of an atmospheric phase screen based on ground-based synthetic aperture radar interference. Background technique [0002] Ground-based synthetic aperture radar interferometry (Ground Based radar, GB radar, referred to as ground-based radar) technology is based on the microwave detection active imaging method to obtain two-dimensional images of the monitoring area, through synthetic aperture technology and step frequency technology to achieve radar image azimuth and distance High spatial resolution overcomes the shortcomings of space-borne SAR image due to serious time-space decoherence and low time-space resolution. Through interferometric technology, it can achieve better than millimeter-level micro-deformation monitoring. Using GB radar technology can accurately measure the surface of the measured object along the radar. The basic principle of the line of...

AI Technical Summary

Problems solved by technology

[0004] The technical problem solved by the present invention is to overcome the problems in the existing ground-based radar data processing method that the data processing process is relatively complicated and easily affected by atmospheric disturbance or system noise

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