Method of extracting permanent scatterers by using small data set SAR (Synthetic Aperture Radar) image sequence

A permanent scatterer, image sequence technology, applied in the direction of using re-radiation, reflection/re-radiation of radio waves, measurement devices, etc., can solve the problem of difficult to obtain extraction results from small data set SAR image sequences.

Active Publication Date: 2014-04-02
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

Since the existing PS extraction method is difficult to obtain satisfactory extraction results when applied to small data set SAR image sequences, we must adopt a new and effective PS extraction method

Method used

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  • Method of extracting permanent scatterers by using small data set SAR (Synthetic Aperture Radar) image sequence
  • Method of extracting permanent scatterers by using small data set SAR (Synthetic Aperture Radar) image sequence
  • Method of extracting permanent scatterers by using small data set SAR (Synthetic Aperture Radar) image sequence

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Embodiment Construction

[0034] figure 1 It is a schematic flow chart of the principle of the present invention. The technical solution includes preprocessing the SAR image sequence based on the spaceborne SAR image sequence, and then performing the estimation of the signal-to-clutter ratio in the space domain and the signal-to-clutter ratio in the time domain, and obtaining the PS extraction result through PS judgment.

[0035] figure 2 It is a diagram of the results of the experiment using the embodiment of the present invention. Among them, the corresponding area of ​​the SAR image is Anaheim in the United States, the abscissa is the azimuth (km), the ordinate is the distance (km), and the extracted PS is marked with a white dot. Among them, the SAR image sequence used includes 12 images, that is, M=12, and the clutter estimation area is selected using the hollow window method. The total size of the rectangular window is 12 pixels×12 pixels, and the size of the window hollow area is 5 pixels×5 p...

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Abstract

The invention provides a method of extracting permanent scatterers by using a small data set SAR (Synthetic Aperture Radar) image sequence. According to the technical scheme, 8-15 SAR image sequences are utilized, the SAR image sequences are preprocessed, airspace signal to clutter ratio estimation and time domain signal to clutter ratio estimation are performed, and PS judgment is performed to obtain a PS extract result. The method has the beneficial effects that the implementation is simple, the accuracy is high, and the applicable range is wide.

Description

technical field [0001] The invention relates to the cross technical field of microwave remote sensing and signal processing, in particular to a method for extracting permanent scatterers using small data set SAR (Synthetic Aperture Radar, Synthetic Aperture Radar) images. Background technique [0002] PS (Permanent Scatterers, permanent scatterers) technology is a typical long-term sequence differential interferometry technology, which can obtain millimeter-level surface deformation information by processing several SAR images of the same area acquired by the spaceborne SAR system at different times. Therefore, it is widely used in natural disaster monitoring, surface deformation extraction, urban settlement prevention, etc., and has important application value. [0003] The PS technology processing flow includes PS extraction, PS network construction, PS network parameter solution and optimization, and surface deformation field extraction. Among them, the accuracy of PS ext...

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Application Information

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IPC IPC(8): G01S7/02G01S13/90
CPCG01S7/41G01S13/885G01S13/9023
Inventor 余安喜陈绍劲董臻杨阳张永胜孙造宇金光虎何志华
Owner NAT UNIV OF DEFENSE TECH
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