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Polarization calibration method based on platform attitude time variation compensation

A time-varying, attitude technology, applied in the field of full-polarization synthetic aperture radar signal processing, can solve problems such as accuracy and comprehensiveness

Active Publication Date: 2014-03-19
济钢防务技术有限公司
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Problems solved by technology

[0018] In short, the models based on the existing technical solutions have problems in accuracy and comprehensiveness, and the corresponding compensation methods also need to be corrected

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  • Polarization calibration method based on platform attitude time variation compensation
  • Polarization calibration method based on platform attitude time variation compensation
  • Polarization calibration method based on platform attitude time variation compensation

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Embodiment Construction

[0035] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to specific examples and accompanying drawings.

[0036] like figure 1 Show the technical scheme of the present invention as follows:

[0037] 1) Obtain two-dimensional echo data

[0038] From the original echo data of the four polarization channels obtained by the fully polarized synthetic aperture radar system loaded on the platform, perform range compression, range migration correction processing, and channel registration processing to obtain two-dimensional echo data;

[0039] 2) Extract the scaler scattering matrix from the raw echo data

[0040] From the two-dimensional echo data processed in the first step, according to the azimuth coordinates of the scaler and the synthetic aperture time parameters of the full-polarization synthetic aperture radar system, the same irradiation time o...

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Abstract

The invention relates to a polarization calibration method based on platform attitude time variation compensation. The method comprises steps that: S1, two-dimensional echo data is acquired; S2, scattering matrix observation values of a calibrator at one same irradiation time are extracted; S3, an incidence angle and an oblique angle of the calibrator irradiated by electromagnetic waves are acquired; S4, when the calibrator receives polarization calibration angles of the electromagnetic waves, deflection amount at each irradiation time is acquired; S5, full polarization echo data after attitude error compensation correction is acquired; S6, azimuth compression of the full polarization echo data after the attitude error compensation correction is carried out to acquire an image; and S7, scattering matrixes after calibrator deflection amount correction are extracted in each polarization channel of the image, an unbalance degree which is left over in the scattering matrixes after calibrator deflection amount correction and is led in by a transceiver module of a full polarization synthetic aperture radar system, and crosstalk in each channel are evaluated, error correction of the full polarization synthetic aperture radar system is realized, and the full polarization synthetic aperture radar image is acquired.

Description

technical field [0001] The invention belongs to the field of full polarization synthetic aperture radar (PolSAR) signal processing, and specifically relates to polarization calibration processing and attitude error compensation methods Background technique [0002] Polarization calibration is an important link in the signal processing of Polarimetric Synthetic Aperture Radar (PolSAR). Its main purpose is to correct system errors and restore the polarization scattering characteristics of targets in imaging results. Therefore, only through polarization calibration processing can the accurate polarization information of the target be extracted from PolSAR images to support subsequent applications. [0003] Existing PolSAR polarization calibration methods mainly include three types of calibration algorithms based on point targets, distributed targets and mixed targets. Among them, the calibration algorithm based on the distributed target, taking the Sarabandi algorithm [Kamal S...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/40
CPCG01S7/40G01S13/90G01S13/9076
Inventor 胡丁晟仇晓兰胡东辉丁赤飚
Owner 济钢防务技术有限公司
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