Atmospheric phase screen extraction method based on ground-based SAR (synthetic aperture radar) interference

A synthetic aperture radar, atmospheric phase technology, applied in the field of surveying, can solve the problems of noise impact, complex data processing process, atmospheric disturbance system, etc.

Inactive Publication Date: 2015-02-18
HOHAI UNIV
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[0004] The technical problem solved by the present invention is to overcome the problems in the existing ground-based radar data pr...

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  • Atmospheric phase screen extraction method based on ground-based SAR (synthetic aperture radar) interference
  • Atmospheric phase screen extraction method based on ground-based SAR (synthetic aperture radar) interference
  • Atmospheric phase screen extraction method based on ground-based SAR (synthetic aperture radar) interference

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[0045] The present invention will be further described below in conjunction with the accompanying drawings of the specification.

[0046] The atmospheric phase screen extraction method based on ground-based synthetic aperture radar interference of the present invention extracts the atmospheric phase based on the ground-based radar differential interference phase model, the least squares method fitting linear deformation and the spatio-temporal filtering method, and the interference phase model fully considers the ground-based radar imaging mechanism And the principle of differential interference to extract the atmospheric phase screen. The present invention proposes a three-level PS point selection method for amplitude dispersion index, coherence index and phase stability. Finally, the atmospheric phase screen of each scene radar data is obtained by Kriging interpolation to accurately extract the received The phase generated by atmospheric influence plays an important role in impr...

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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 atmospheric phase screen extraction method based on ground-based synthetic aperture radar interference. Background technique [0002] Ground Based Synthetic Aperture Radar Interferometry (Ground Based Radar, GB radar, ground-based radar for short) technology is based on the microwave detection active imaging method to obtain two-dimensional images of the monitoring area, and realize the radar image azimuth and range through synthetic aperture technology and step frequency technology High spatial resolution, overcoming the shortcomings of severe spatiotemporal decoherence and low spatiotemporal resolution of space-borne SAR images. Interference technology can achieve better than millimeter-level micro-deformation monitoring. The GB radar technology can accurately measure the surface of the measured object. The basic principle of the micro-deformation information of the line of sig...

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Application Information

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IPC IPC(8): G01S7/41G01S13/90
CPCG01S7/2923G01S7/354G01S13/9023
Inventor 岳建平邱志伟汪学琴岳顺曾庆宝刘斌
Owner HOHAI UNIV
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