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Polarimetric Calibration Using Distributed Odd-bounce Targets

Polarimetric Calibration Using Distributed Odd-bounce Targets. Jiong CHEN 1, 3* Motoyuki SATO 2 Jian YANG 3 1. Graduate School of Environmental Studies, Tohoku University, Japan 2. Center for Northeast Asian Studies, Tohoku University, Japan

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Polarimetric Calibration Using Distributed Odd-bounce Targets

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  1. Polarimetric Calibration Using Distributed Odd-bounce Targets Jiong CHEN 1, 3* Motoyuki SATO 2 Jian YANG 3 1. Graduate School of Environmental Studies, Tohoku University, Japan 2. Center for Northeast Asian Studies, Tohoku University, Japan 3. Department of Electronic Engineering, Tsinghua University, China *E-mail: jiongc@cneas.tohoku.ac.jp 07/2011

  2. Introduction ALOS/PALSAR Y. Oh 1992 H. Yamada, et.al. 2001 Estimation of biomass Retrieval of soil moisture After calibration Monitoring of flood Classification of terrain

  3. Polarimetric Calibration • Polarimetric SAR Model for Calibration • Basic Assumptions • Conventional Methods

  4. Motivations • The deployment of trihedral is inconvenient • For low frequency system, the size should be relatively large • To implement calibration ubiquitously • The assumption is not always valid • Only valid for statistically symmetric distributed targets • Small value will cause large bias in the calibration results Develop a calibration method without the trihedral or the assumption

  5. Basic Scheme and Assumptions Conventional method : Trihedral Proposed method : Use the statistic information of odd-bounce targets Robust estimator using odd-bounce targets Assume cross-talk to be small Advantage : 1. Standard trihedral calibrator is not needed 2. The assumption is not needed

  6. Decomposition of Distortion Matrix Channel Imbalance Non-reciprocal effect Cross-talk

  7. Selection of Odd-bounce Targets Statistical information of odd-bounce targets Trihedral Flight direction Typical odd-bounce targets Amplitude Phase Statistical property Optical image, captured from Google Earth

  8. Removal of Channel Imbalance

  9. Robust Estimator of Non-reciprocal Effect • Odd-bounce targets : Good for the estimation of • Distribution of on odd-bounce targets : Laplace Similarity Parameters The robust estimate Laplace distribution with different parameters Fitting Result

  10. Estimation of Cross-talk On Odd-bounce targets Assuming Assuming Estimated Distortion Matrix

  11. Discussion on Results • Calibration result New distortion matrices JAXA standard calibrated result Uncalibrated JAXA Standard distortion matrices New calibrated result Theoretical result Co-polarized signature on trihedral

  12. Removal of Faraday Rotation Sendai 070414 Sendai 090604 Alaska 070729

  13. Conclusion • A practical calibration scheme based on distributed odd-bounce targets is proposed • The distortion matrix is decomposed firstly • The statistical information of odd-bounce targets is used as alternative to trihedral • A robust estimator based on odd-bounce targets is derived to estimate the non-reciprocal effect • It can be used as a rough calibration method without the special deployment of trihedral calibrators, nor the un-correlation consumption

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