Multi-polarization SAR compact polarimetry calibration method

A simplified polarization and calibration technology, applied in radio wave reflection/re-radiation, using re-radiation, measuring devices, etc., can solve the problems of low processing precision of corner reflectors and simple equipment requirements

Active Publication Date: 2017-02-15
XIAN INSTITUE OF SPACE RADIO TECH
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Problems solved by technology

[0007] The technical problem of the present invention is to overcome the deficiencies of the existing reduced polarization mode calibration method and provide an improved multi-polarization SAR reduced polarization mode calibration method. This method only uses corner reflectors to complete the reduction The calibration of the polarization distortion parameters in the polarization mode requires simple equipment; the calibration algorithm uses the relative ratio o...

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  • Multi-polarization SAR compact polarimetry calibration method
  • Multi-polarization SAR compact polarimetry calibration method

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[0130] Such as figure 2 with image 3 As shown, four different types of corner reflectors are first arranged in the calibration field (in this embodiment, the calibration field is selected on the grass beside the airport runway), and then the SAR image of the calibration field is obtained, as shown in Figure 4 shown.

[0131] The calibration field reduced polarization SAR image used in this embodiment is generated based on the purchased RADARSAT-2 full polarization SAR image simulation simulation, and the RADARSAT-2 full polarization image can be used to calculate the RH and RV channel SAR in the reduced polarization mode image, and then add the polarization distortion parameter error to simulate the reduced polarimetric SAR image data under the influence of the error. Since the purchased RADARSAT-2 fully polarimetric SAR images have been radiation-corrected, and RADARSAT-2 works in the C-band, part of the content of the calibration field reduction polarization SAR data pr...

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Abstract

The invention provides a multi-polarization SAR compact polarimetry calibration method which comprises a calibration field compact polarimetry SAR data preprocessing process and a polarization distortion parameter calibration process. In the calibration field compact polarimetry SAR data preprocessing process, compact polarimetry SAR data radiation correction and Faraday rotation correction are mainly completed. In the polarization distortion parameter calibration process, four different types of common corner reflectors are used as reference calibrators, and a compact polarimetry calibration method (namely, a compact polarimetry polarization distortion parameter calibration method) is deduced based on a calibration model. Through the method, a polarization distortion parameter can be calibrated precisely. The calibration algorithm does not depend on the absolute RCS values of the corner reflectors, and calibration error caused by RCS inconsistency of different corner reflectors can be avoided effectively. The algorithm is of high robustness and practicability.

Description

technical field [0001] The invention relates to a multi-polarization SAR simplified polarization mode calibration method, which belongs to the technical field of synthetic aperture radar (SAR) data processing. Background technique [0002] Spaceborne Synthetic Aperture Radar (SAR), as an important means of high-resolution microwave remote sensing for earth observation, has received more and more attention in recent years. SAR has all-day and all-weather working capabilities, and can obtain high-resolution images of targets in multi-band and multi-polarization modes, so it is widely used in terrain mapping, ocean monitoring, disaster reduction and prevention, agriculture, forestry, and military reconnaissance. play an important role. [0003] Compact Polarimetry is an important working mode of multi-polarization SAR, which uses the dual-polarization SAR system to construct the pseudo-full polarization information of the observation target. The simplified polarization mode t...

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Application Information

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IPC IPC(8): G01S13/90G01S7/02G01S7/40
CPCG01S7/024G01S7/4004G01S13/904G01S13/9076
Inventor 胡继伟谭小敏党红杏
Owner XIAN INSTITUE OF SPACE RADIO TECH
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