Atmospheric interference phase correction method for ground-based arc interference synthetic aperture radar

Abstract

The invention is suitable for the technical field of surveying and mapping science, and relates to a foundation arc interference synthetic aperture radar atmospheric interference phase correction method comprising the following steps: constructing a foundation arc interference synthetic aperture radar differential interference phase model; eliminating phase noise; screening permanent scattering points; subspace division is carried out on the obtained interference phase in the azimuth direction, grid division is carried out on the subspace according to the size of a set window, phase weighted average processing is carried out on permanent scattering points in a grid according to a correlation coefficient and amplitude deviation, and the processed permanent scattering points serve as atmospheric interference phase sample points of a grid center point; screening the obtained atmospheric interference phase sample points to obtain available sample points; using the available sample points to estimate atmospheric interference phase error model parameters, and then obtaining the atmospheric interference phase error of the detection area; and the deformation phase is obtained. The method is simple and efficient, external auxiliary data does not need to be introduced, the atmospheric interference phase is corrected only by depending on the interference phase, and the method has high correction precision.

Description

technical field [0001] The invention belongs to the field of surveying and mapping science and technology, and in particular relates to a ground-based circular-arc interference synthetic aperture radar atmospheric interference phase correction method. Background technique [0002] SAR (Synthetic Aperture Radar), as an all-day, all-weather, high-resolution imaging radar, is widely used in the field of remote sensing. Since the SAR image has phase information, the non-contact and high-precision extraction of the deformation information of the imaging area can be realized through the interference processing of the SAR image sequence. In view of the above advantages of the SAR system, it has become one of the important means of ground deformation monitoring. one. Traditional SAR is mostly carried on platforms such as satellites and aircraft, which makes the radar revisit time very long and cannot continuously monitor specific targets. Ground-Based SAR (Ground Based SAR, GBSAR)...

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Problems solved by technology

[0005] Aiming at the deficiencies in the prior art, the purpose of the present invention is to provide a ground-based circular-arc interference synthetic aperture radar atmospheric interference phase correction method to solve the need to introduce external data in the ground-based circular-arc interference synthetic aperture radar atmospheric interference phase correction method in the prior art At the same time, the problem of low accuracy

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