A Correction Method of the Faraday Rotation Effect Based on the Frequency-Domain Ambiguity-Resolving in Spaceborne P-Band Full-Polarimetric SAR

ZHANG Yong-sheng; YU Chun-rui; JI Yi-fei; DONG Zhen; ZHANG Qi-lei; YU Lei; GAN Nan; YAO Bai-dong

doi:10.12263/DZXB.20210698

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A Correction Method of the Faraday Rotation Effect Based on the Frequency-Domain Ambiguity-Resolving in Spaceborne P-Band Full-Polarimetric SAR

PAPERS | 更新时间：2025-12-08

- A Correction Method of the Faraday Rotation Effect Based on the Frequency-Domain Ambiguity-Resolving in Spaceborne P-Band Full-Polarimetric SAR
- ACTA ELECTRONICA SINICA Vol. 51, Issue 3, Pages: 585-592(2023)
- 作者机构：
  
  1.国防科技大学电子科学学院,湖南长沙 410073
  2.北京跟踪与通信技术研究所,北京 100094
  3.华东电子工程研究所对地观测研究与发展中心,安徽合肥 230031
- 作者简介：
- 基金信息：
  
  Foundation Item(s):　National Natural Science Foundation of China(62101568;61501477)
- DOI：10.12263/DZXB.20210698
  CLC： TN957
- Received：01 June 2021，
  
  Revised：2021-10-18，
  
  Published：25 March 2023
- 稿件说明：
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张永胜,于春锐,计一飞等.一种基于频域解模糊的星载P波段全极化SAR法拉第旋转效应校正方法[J].电子学报,2023,51(03):585-592.

ZHANG Yong-sheng,YU Chun-rui,JI Yi-fei,et al.A Correction Method of the Faraday Rotation Effect Based on the Frequency-Domain Ambiguity-Resolving in Spaceborne P-Band Full-Polarimetric SAR[J].ACTA ELECTRONICA SINICA,2023,51(03):585-592.
张永胜,于春锐,计一飞等.一种基于频域解模糊的星载P波段全极化SAR法拉第旋转效应校正方法[J].电子学报,2023,51(03):585-592. DOI： 10.12263/DZXB.20210698.

ZHANG Yong-sheng,YU Chun-rui,JI Yi-fei,et al.A Correction Method of the Faraday Rotation Effect Based on the Frequency-Domain Ambiguity-Resolving in Spaceborne P-Band Full-Polarimetric SAR[J].ACTA ELECTRONICA SINICA,2023,51(03):585-592. DOI： 10.12263/DZXB.20210698.

摘要

星载P波段合成孔径雷达（Synthetic Aperture Radar， SAR）极化测量性能易受电离层法拉第旋转（Faraday Rotation， FR）效应的影响，随着系统带宽增加，以及中心频率对应的法拉第旋转角（FR Angle， FRA）增大，FR效应色散特征突显，将导致距离向成像恶化以及额外的极化测量误差.针对色散FR效应，提出了一种基于频域解模糊的星载P波段全极化SAR法拉第旋转效应校正方法，通过模糊度一致化以及频域拟合等关键步骤，解决了P波段SAR系统FRA估计值模糊问题，最后在频域实现色散FR效应的校正.利用机载P波段全极化SAR数据开展了仿真验证实验，与传统的图像域校正方法相比，有效抑制了色散的FR效应，显著改善了交叉极化通道图像之间的相关性.

Abstract

The spaceborne P-band synthetic aperture radar (SAR) polarimetric performance is susceptible to the effect of ionospheric Faraday rotation (FR). In particular

as the system bandwidth increases and the FR angle(FRA) with regard to the center frequency increase

the dispersion feature of the FR effect becomes prominent

which will result in the range-imaging deteriorations and extra polarimetric errors. As to the dispersive FR effect

a correction method of the FR effect based on the frequency-domain ambiguity-resolving in spaceborne P-band full-polarimetric SAR is proposed. By implementing the key steps of the ambiguity-extent uniformization and frequency-domain fitting

we solve the problem of FRA estimate ambiguity for P-band SAR systems. Finally

the FR correction is realized in the frequency domain. A set of airborne P-band full-polarimetric SAR data is used for the simulation validation experiment. Compared with the conventional image-domain correction method

the proposed method effectively mitigates the dispersive FR effect

and significantly improves the correlation of the cross-pol channel images.

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references

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