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Method for estimating Faraday rotation angle (FRA) in satellite borne complete polarization synthetic aperture radar (SAR) data

A fully polarized, spaceborne technology, which is applied in the intersection of aerospace and microwave remote sensing, and can solve the problems of system phase imbalance and large influence.

Inactive Publication Date: 2013-07-10
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

The existing two types of FRA estimation methods mentioned above are greatly affected by the phase imbalance of the system

Method used

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  • Method for estimating Faraday rotation angle (FRA) in satellite borne complete polarization synthetic aperture radar (SAR) data
  • Method for estimating Faraday rotation angle (FRA) in satellite borne complete polarization synthetic aperture radar (SAR) data
  • Method for estimating Faraday rotation angle (FRA) in satellite borne complete polarization synthetic aperture radar (SAR) data

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Embodiment Construction

[0029] figure 1 It is a flowchart of FRA estimation in the satellite-borne full polarization data provided by the present invention. The whole process is divided into three steps. Taking the measurement vector of the spaceborne fully polarized SAR scattering matrix as input, the first step is to obtain the PCM: obtain the corresponding PCM according to the measurement vector of the scattering matrix; the second step is to construct the FRA estimation complex number: use the PCM corresponding to the measurement vector The real part of the diagonal elements and the diagonal elements construct complex numbers related to FRA. The third step, FRA estimation: The FRA estimation is completed by taking the angle and halving the complex number constructed in the second step.

[0030] figure 2 It is the result of full polarization imaging of the Amazon area measured by the Japanese ALOS PALSAR satellite. This imaging result is taken as the scattering matrix measurement value, that is, ...

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Abstract

The invention provides a method for estimating a Faraday rotation angle (FRA) in satellite borne complete polarization synthetic aperture radar (SAR) data. The technical scheme comprises that the method comprises the steps of using measurement vector quantity of a satellite borne complete polarization SAR scattering matrix as input, (1) obtaining a polarimetric covariance matrix (PCM), obtaining the corresponding PCM of the measurement vector quantity according to the measurement vector quantity of the scattering matrix, (2) constructing a complex number for estimating the FRA, constructing the complex number relevant to the FRA through a real part of a non-diagonal element of the corresponding PCM of the measurement vector quantity and a diagonal element of the corresponding PCM of the measurement vector quantity, (3) estimating the FRA, and achieving the FRA estimation through the fact that the operations of angle taking and angle halving are carried on the complex number constructed in the step (2). The method for estimating the FRA of the satellite borne complete polarization SAR data is essentially free of influences of unbalanced system phases and steady in property.

Description

Technical field [0001] The invention belongs to the cross-technology field of aerospace and microwave remote sensing, and particularly relates to a method for estimating ionospheric FRA (Faraday Rotation Angle) in spaceborne fully polarized SAR (Synthetic Aperture Radar) data. Its advantage is that in the case of the system with phase imbalance error, FRA can still be accurately estimated, and the performance is robust. Background technique [0002] Full polarization is one of the important directions for the development of spaceborne SAR. Spaceborne full polarization SAR is of great significance in the fields of vegetation measurement and biomass retrieval. FR (Faraday Rotation, Faraday Rotation) is a phenomenon in which the direction of the polarization vector is deflected when electromagnetic waves pass through the ionosphere and are affected by the geomagnetic field. Studies have shown that space-borne fully polarized SAR data in the L and P bands affected by FR cannot be di...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/02
Inventor 张永胜李力董臻黄海风孙造宇金光虎余安喜何峰何志华杜湘瑜陈祺马喜乐
Owner NAT UNIV OF DEFENSE TECH
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