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Polarimetric SAR (Synthetic Aperture Radar) interferometry image registration method based on optimal correlation coefficient linearity

A technology of coherence coefficient and image registration, which is applied in the direction of radio wave reflection/re-radiation, radio wave measurement system, utilization of re-radiation, etc., can solve the problems of large registration error and low precision

Inactive Publication Date: 2012-06-27
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

[0005] The purpose of the present invention is to overcome the defects of the prior art and solve the problems of large registration errors and low precision when the traditional image registration method is processing the polarization interference SAR image of the vegetation coverage area, and proposes a method based on the coherence coefficient A polarimetric interferometric SAR image registration method with optimal linearity

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  • Polarimetric SAR (Synthetic Aperture Radar) interferometry image registration method based on optimal correlation coefficient linearity
  • Polarimetric SAR (Synthetic Aperture Radar) interferometry image registration method based on optimal correlation coefficient linearity
  • Polarimetric SAR (Synthetic Aperture Radar) interferometry image registration method based on optimal correlation coefficient linearity

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[0039] A polarimetric interferometric SAR image registration method based on the optimal linearity of the coherence coefficient. The observation scene is assumed to be a forested area. The implementation process is as follows: figure 1 As shown, the specific steps are:

[0040] Step 1. Obtain the HH+VV polarization image and HH-VV polarization image of the main array element and the HH polarization image of the slave array element according to the HH polarization image, HV polarization image and VV polarization image of the master and slave array , HV polarization image, VV polarization image, HH+VV polarization image and HH-VV polarization image. Methods as below:

[0041] First, according to the geometric relationship of interferometric SAR, the initial value ρ of the master-slave array element image offset is obtained 0 :

[0042] ρ 0 = H / cos θ ...

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Abstract

The invention relates to a polarimetric SAR (Synthetic Aperture Radar) interferometry image registration method based on optimal correlation coefficient linearity, which belongs to the technical field of radar signal processing. Through utilizing a function relationship between relevant coefficient linearity of each polarimetric channel and image registration deviation, an image offset value withthe optimum relevant coefficient linearity is used as an image registration value. Due to the full utilization of interferometry and polarimetric information of a target, higher image registration accuracy is provided for a vegetation-covered area with serious volume scattering and uniform back scattering, and the existing problems of large registration error and low accuracy when the traditionalimage registration method is used for processing the polarimetric SAR interferometry image of the vegetation-covered area are effectively solved.

Description

technical field [0001] The invention relates to a method for registering images of polarization interference synthetic aperture radar (SAR), which belongs to the technical field of radar signal processing. Background technique [0002] Complex image registration is an extremely important step in the process of polarimetric SAR signal processing. If there is a deviation in complex image registration, it will cause complex signals of different targets to interfere, thereby reducing the signal-to-noise ratio of interference fringes and affecting the accuracy of elevation inversion. Therefore, the high-precision registration of complex images is the premise and basis for data processing of polarimetric SAR. [0003] For non-vegetated areas, due to the small influence of volume scattering decoherence, traditional interferometric SAR image registration methods can be used for image registration, such as correlation function method, average wave function method and maximum spectru...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90
Inventor 吴莎莎杨静闫道伟吕争
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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