A Novel Point Target Attitude Compensation Method Using Electromagnetic Reflectance Theory

During the process of the airborne synthetic aperture radar (SAR) system platform in space, platform attitude deflection is inevitable. However, large attitude deflection angles are unacceptable for polarimetric calibration using point targets, especially the dihedral, which is very sensitive to the...

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Main Authors: Yonghui Han, Pingping Lu, Wentao Hou, Yao Gao, Robert Wang
Format: Article
Language:English
Published: MDPI AG 2023-04-01
Series:Remote Sensing
Subjects:
Online Access:https://www.mdpi.com/2072-4292/15/9/2345
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author Yonghui Han
Pingping Lu
Wentao Hou
Yao Gao
Robert Wang
author_facet Yonghui Han
Pingping Lu
Wentao Hou
Yao Gao
Robert Wang
author_sort Yonghui Han
collection DOAJ
description During the process of the airborne synthetic aperture radar (SAR) system platform in space, platform attitude deflection is inevitable. However, large attitude deflection angles are unacceptable for polarimetric calibration using point targets, especially the dihedral, which is very sensitive to the pointing angle of the radar. To mitigate the impact of attitude angles on calibration accuracy, attitude compensation of the corner reflector is necessary during the calibration process. The conventional approach to attitude compensation typically maps the three-dimensional attitude angle information to the one-dimensional polarimetric orientation angle (POA) information. However, the reduction of dimension inevitably results in information loss, leading to errors that affect calibration performance when the attitude angle is large. In order to ensure the accuracy of point target calibration, this paper proposes a novel point target compensation method based on the reflection theory of electromagnetic waves. This method is based on three-dimensional attitude angle information and has higher reliability than the POA method. Finally, this paper calculates the distance between the scattering matrices obtained after compensation based on the proposed method and the POA method to obtain the difference in the performance of the two methods. Through a simulation, this paper finds that when the attitude angle is small, the results of the two schemes are approximately the same, but as the attitude angle increases, the error between the two gradually increases. This suggests that the proposed method has greater advantages in the case of attitude deflection. Furthermore, the proposed method does not require additional information supplementation compared with the equivalent POA method, making it highly practical.
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spelling doaj.art-bb3340cd3e5946e096850aecbf3e176d2023-11-17T23:38:52ZengMDPI AGRemote Sensing2072-42922023-04-01159234510.3390/rs15092345A Novel Point Target Attitude Compensation Method Using Electromagnetic Reflectance TheoryYonghui Han0Pingping Lu1Wentao Hou2Yao Gao3Robert Wang4National Key Laboratory of Microwave Imaging Technology, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100190, ChinaNational Key Laboratory of Microwave Imaging Technology, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100190, ChinaInstitute of Remote Sensing Satellite, China Academy of Space Technology (CAST), Beijing 100094, ChinaNational Key Laboratory of Microwave Imaging Technology, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100190, ChinaNational Key Laboratory of Microwave Imaging Technology, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100190, ChinaDuring the process of the airborne synthetic aperture radar (SAR) system platform in space, platform attitude deflection is inevitable. However, large attitude deflection angles are unacceptable for polarimetric calibration using point targets, especially the dihedral, which is very sensitive to the pointing angle of the radar. To mitigate the impact of attitude angles on calibration accuracy, attitude compensation of the corner reflector is necessary during the calibration process. The conventional approach to attitude compensation typically maps the three-dimensional attitude angle information to the one-dimensional polarimetric orientation angle (POA) information. However, the reduction of dimension inevitably results in information loss, leading to errors that affect calibration performance when the attitude angle is large. In order to ensure the accuracy of point target calibration, this paper proposes a novel point target compensation method based on the reflection theory of electromagnetic waves. This method is based on three-dimensional attitude angle information and has higher reliability than the POA method. Finally, this paper calculates the distance between the scattering matrices obtained after compensation based on the proposed method and the POA method to obtain the difference in the performance of the two methods. Through a simulation, this paper finds that when the attitude angle is small, the results of the two schemes are approximately the same, but as the attitude angle increases, the error between the two gradually increases. This suggests that the proposed method has greater advantages in the case of attitude deflection. Furthermore, the proposed method does not require additional information supplementation compared with the equivalent POA method, making it highly practical.https://www.mdpi.com/2072-4292/15/9/2345polarimetric calibrationpoint targetsynthetic aperture radar (SAR)
spellingShingle Yonghui Han
Pingping Lu
Wentao Hou
Yao Gao
Robert Wang
A Novel Point Target Attitude Compensation Method Using Electromagnetic Reflectance Theory
Remote Sensing
polarimetric calibration
point target
synthetic aperture radar (SAR)
title A Novel Point Target Attitude Compensation Method Using Electromagnetic Reflectance Theory
title_full A Novel Point Target Attitude Compensation Method Using Electromagnetic Reflectance Theory
title_fullStr A Novel Point Target Attitude Compensation Method Using Electromagnetic Reflectance Theory
title_full_unstemmed A Novel Point Target Attitude Compensation Method Using Electromagnetic Reflectance Theory
title_short A Novel Point Target Attitude Compensation Method Using Electromagnetic Reflectance Theory
title_sort novel point target attitude compensation method using electromagnetic reflectance theory
topic polarimetric calibration
point target
synthetic aperture radar (SAR)
url https://www.mdpi.com/2072-4292/15/9/2345
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