An adaptive polarization calibration method independent of corner reflectors

Bowen Chi; Guoman Huang; Lijun Lu

doi:10.1117/12.3024340

21 February 2024 An adaptive polarization calibration method independent of corner reflectors

Bowen Chi, Guoman Huang, Lijun Lu

Proceedings Volume 12988, Second International Conference on Environmental Remote Sensing and Geographic Information Technology (ERSGIT 2023); 129881E (2024) https://doi.org/10.1117/12.3024340
Event: Second International Conference on Environmental Remote Sensing and Geographic Information Technology (ERSGIT 2023), 2023, Xi’an, China

Abstract

Polarization calibration (PolCal) is necessary for the quantitative application of polarimetric SAR data. The classic PolCal methods rely on corner reflectors (CRs) to calculate parameters, but the deployment of CRs is extremely expensive and they cannot even be deployed in complex terrains. Therefore, currently advanced methods can achieve calibration without relying on CRs. This method is based on the Bragg-like targets and uses the unitary zero helix (UZH) constraint to estimate the co-pol channel imbalance k for the segmented image by Gaussian Newton method. In this process, it is necessary to select appropriate range of k samples for fitting to obtain the final estimate of k. A fixed threshold may lead to improper sample selection, thereby reducing the accuracy of calibration. Therefore, this paper proposes an adaptive PolCal method, which introduces a coefficient of variation to adaptively select samples, and then ultimately estimates k using the best fit line. This paper conducts PolCal experiments using the image of GF3 02 satellite in the calibration field of Etuoke Banner, Inner Mongolia on January 1, 2022. The experiments demonstrate that the proposed method can enhance the stability of the PolCal method independent of CRs and further improve calibration accuracy.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Bowen Chi, Guoman Huang, and Lijun Lu "An adaptive polarization calibration method independent of corner reflectors", Proc. SPIE 12988, Second International Conference on Environmental Remote Sensing and Geographic Information Technology (ERSGIT 2023), 129881E (21 February 2024); https://doi.org/10.1117/12.3024340

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KEYWORDS

Calibration

Chromium

Polarization

Matrices

Crosstalk

Distortion

Reflectors

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