Broadband synthetic aperture radar sub-band interferometric data processing method

A technology of synthetic aperture and data processing, which is applied in the direction of radio wave reflection/re-radiation, utilization of re-radiation, measurement devices, etc., which can solve the problems of insignificant effect, increasing the difficulty and cost of hardware manufacturing, etc.

Inactive Publication Date: 2014-04-16
CHINA AERO GEOPHYSICAL SURVEY & REMOTE SENSING CENT FOR LAND & RESOURCES
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Problems solved by technology

[0008] Obviously, it can be seen from equations (1) and (2) that increasing the radar carrier wavelength can increase the elevation and deformation ambiguity of interferometry, but this will increase the difficulty and cost of hardware manufacturing, and the effect is not significant. Because the increase of several times or ten times cannot meet the actual needs of the project

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[0065] Taking the deformation monitoring of the Shuping landslide in the Three Gorges Dam area of ​​the Yangtze River as an example, the specific operation steps of the present invention in practical engineering application are illustrated. See Figure 8 , the present invention is a kind of broadband synthetic aperture radar sub-band interference data processing method, and the concrete steps of this method are as follows:

[0066] Step 1: Data selection and adaptive fine registration of primary and secondary images

[0067] 1. Applicability considerations for subband interferometry

[0068] According to the purpose of the project and the topography of the work area, the degree of vegetation coverage on the ground and the deformation of the ground surface, it is judged whether to use the sub-band interference technology. For the purpose of generating DEM, it is only suitable for high mountain areas, and for deformation monitoring, it is only suitable for areas with large def...

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Abstract

Provided is a broadband synthetic aperture radar sub-band interferometric data processing method. The broadband synthetic aperture radar sub-band interferometric data processing method comprises the steps of (1) carrying out self-adaptive precise registration on main images and auxiliary images and resampling the auxiliary images, (2) optimizing sub-band frequency spectrum positions and broadband, (3) carrying out band-pass filtering on the main images and the auxiliary images, (4) generating sub-band interferograms and sub-band difference interferograms, (5) carrying out phase compensation on a reference plane and a DEM, and (6) carrying out stack processing on the sub-band difference interferograms. According to the broadband synthetic aperture radar sub-band interferometric data processing method, absolute radar interferometric phases can be obtained without phase unwrapping under most conditions, digital terrain maps or earth surface deformation maps can be directly obtained through transformation, and error diffusion caused by phase unwrapping mistakes can be eliminated. The broadband synthetic aperture radar sub-band interferometric data processing method is especially suitable for digital topographic mapping in high mapping regions, monitoring on landslides with large deformation velocity and monitoring on mine collapse.

Description

technical field [0001] The invention relates to a method for processing broadband synthetic aperture radar subband interference data, belonging to the technical field of synthetic aperture radar interference. It can obtain absolute radar interferometric phase without phase unwrapping in most cases, so that digital topographic map or surface deformation map can be directly obtained through conversion. Background technique [0002] Synthetic aperture radar interferometry is a technique to extract three-dimensional spatial information of ground targets based on the phase data of high-resolution radar images. Whether using radar interferometry for topographic digital height measurement or surface deformation measurement, there is a process of phase unwrapping. Because the phase of the radar interferogram is wrapped by an angle of 2π, the so-called phase unwrapping is the process of obtaining the absolute phase of the pixel by accumulating the phase gradient between the radar in...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/41
CPCG01S13/0209G01S13/9023G01S13/935G01S13/9004
Inventor 夏耶郭小方范景辉李曼
Owner CHINA AERO GEOPHYSICAL SURVEY & REMOTE SENSING CENT FOR LAND & RESOURCES
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