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A Calibration Method for Fully Polarized SAR Based on Irrotation Region

An irrotational, fully polarized technology, applied in radio wave reflection/re-radiation, radio wave measurement systems, instruments, etc., can solve problems that do not necessarily satisfy irrotational characteristics, and achieve the effect of increasing accuracy

Active Publication Date: 2022-04-08
AEROSPACE INFORMATION RES INST CAS
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, for high scattering entropy H For the surface scattering of , it does not necessarily satisfy the irrotation characteristic
If this area is selected, it will undoubtedly deteriorate the performance of polarization calibration

Method used

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  • A Calibration Method for Fully Polarized SAR Based on Irrotation Region
  • A Calibration Method for Fully Polarized SAR Based on Irrotation Region
  • A Calibration Method for Fully Polarized SAR Based on Irrotation Region

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Embodiment 1

[0066] As a SAR payload for NASA to explore multi-frequency, multi-polarization, and polarization interference, AIRSAR has full-polarization data and elevation information corresponding to P, L, and C frequency bands. It has wide application in analysis and so on. Since unscaled data cannot be obtained, this paper uses AIRSAR data to add channel imbalance and channel crosstalk to describe this embodiment in detail.

[0067] image 3 It shows the processing results of simulated AIRSAR experimental data. Through clipping, the data has no water area, ice area, etc. (a) is given without adding system disorder The exploded view, where the gray dotted line is an example of blocks, (b) shows the system disorder after adding From the exploded view, it can be seen that the image has obvious problems in the distance direction. (c) shows the Bragg-like bare soil points selected through the above process. Compared with (a), it can be seen that after the threshold is set, almost all ...

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Abstract

The invention discloses a full-polarization SAR calibration method based on an irrotational region. The method includes the following steps: Step 1: Construct an uncalibrated full-polarization SAR covariance matrix, and use the Quegan algorithm to solve the polarization crosstalk and The cross-polarization channel is unbalanced and compensated to obtain the compensated image; Step 2: Block the compensated image in azimuth and distance, and then obtain the decomposition and draw the plane; Step 3: Use the threshold to select out of the irrotation region; Step 4: Preliminarily solve the unbalance of the co-polarization channel according to the calibration of the irrotation region; Step 5: Compare the POA obtained by DEM with the POA obtained by polarimetric SAR, and obtain the final co-polarization channel unbalance Balanced results.

Description

technical field [0001] The invention relates to the field of radar calibration, in particular to a polarization calibration algorithm for a fully polarized synthetic aperture radar (Synthetic Aperture Radar, SAR) based on an irrotational region. Background technique [0002] Full polarization SAR obtains the polarization scattering matrix of each pixel in the scene by transmitting and receiving electromagnetic waves of different polarization modes, so as to analyze the scattering characteristics of the target and obtain the characteristics of the ground object, which has been widely used. As the first step in polarimetric SAR data processing, the accuracy of polarimetric calibration directly determines whether the polarimetric application can be carried out smoothly. Polarization calibration is used to establish the relationship between image pixels, backscatter and each channel, which is a key step in the realization of quantitative remote sensing. [0003] Polarization ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/90G01S7/40G06F17/16
CPCG01S13/904G01S7/40G06F17/16
Inventor 赵邢杰邓云凯刘秀清王宇郭航岚
Owner AEROSPACE INFORMATION RES INST CAS